Hertfordshire & Middlesex Branch
Saving butterflies, moths and our environment
The 2026 programme of walks is currently being prepared and events will be added when confirmed.
Whether a member of Butterfly Conservation or not, you are welcome to join us at any of our free butterfly walks or moth events.
This year most events will require advance booking through an online booking provider such as Eventbrite, although some walk leaders are still happy to have no advance booking.
BUTTERFLY WALKS ARE FOR EVERYONE! You most emphatically do NOT have to be an expert to come on a butterfly walk. Butterfly walks can be enjoyed by anyone with any level of knowledge (or none). Photographers, children (with adult supervision), first-time participants, you are ALL welcome. Butterfly Conservation does not ask for any donation or payment to attend their walks; however some of the walks included in this programme when organised by another organisations may request a donation and/or a fee.
Neighbouring branches also have a wide-ranging programme of walks; some are quite close to our branch borders. The full list of Butterfly Conservation events can be viewed on the national website - here
A printable copy of the 2026 walks programme in pdf format is available here (updated 11 April 2026)
Last updated 12 April 2026
| Date: | Friday 24th - Saturday 25th APRIL 2026 Friday 8th - Saturday 9th MAY 2026 |
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| Event Title: | Pollinator Survey Skills - Springfield Park |
| Information | HACKNEY BUZZLINE have set up an i-Naturalist collection group to monitor pollinators called the Hackney Pollinator Patrol. They are organising a 2 day bioblitz event at Springfield Park in Hackney for the City Nature Challenge on Friday 24 and Saturday 25 April (which also uses iNaturalist). Learn how to set up iNaturalist on your phone and join the Hackney Pollinator Patrol. The day will include going out onto the park to practice photographing and recording pollinators. The event will be repeated on 8 and 9 May (but not as part of City Nature Challenge). |
| Details | For more information email |
| Date: | Sunday 3 MAY 2026 * FULLY BOOKED - WAITING LIST ACTIVATED * |
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| Event Title: | Spring butterflies and bluebell walk with the Friends of Cassiobury Park and Watford Borough Council |
| Location: | Whippendell Woods |
| Address and/or grid ref: | Cassiobury Park, Gade Avenue, Watford WD18 7LG. TQ091973 [Landranger Map 166] |
| Time/meeting place: | 14:00 - 16:00 meet just into the park from the entrance opposite Langley Way, WD18 3BD |
| What3words: | https://what3words.com/match.case.bliss |
| Transport & directions: | Cassiobury Park is a 2 minute walk from the Watford Metropolitan line station. Exit the station onto Cassiobury Park Avenue and turn right, after about 150 metres turn left onto Shepherds Road - the park is straight ahead of you. Alternatively Watford Junction (1.3 miles) and Watford High Street (2.1 miles) are the two closest Overground stations. There is one official car park for Cassiobury Park at the end of Gade Avenue near the bottom of Cassiobury Park Avenue (WD18 7LG is the nearest postcode). It should be noted that the car park does get very busy if the weather is good and there is a small charge these days. So best to arrive early to avoid parking problems. There is street parking at weekends along the roads off Langley Way, such as Parkside Drive. |
| Information | There are toilets at the ‘Hub’ although the café in the park can get quite busy therefore it is suggested you bring your own refreshments. |
| Contact details | Peter Fewell ~ 07814 282356 or email: p.fewell@yahoo.com |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Saturday 9 MAY 2026 |
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| Event Title: | Spring butterfly walk at Tower Hamlets Cemetery Park at the invitation of the Friends of Tower Hamlets Cemetery Park (London Borough of Tower Hamlets) |
| Location: | Tower Hamlets Cemetery Park and Local Nature Reserve |
| Address and/or grid ref: | Soanes Centre, Southern Grove, E3 4PX. TQ367823 [Landranger Map 177] |
| Time/meeting place: | 11:00 - 13:00 The Cemetery Park Lodge, the red brick building straight ahead of you as you enter via the main gates on Southern Grove E3 4PX |
| Transport & directions: | Mile End Underground Station (Central, District and Hammersmith and City Lines) is approx. 5 minute walk from the Tube entrance/exit. |
| Information | Weather permitting, we should see 10 or 11 species, including, Brimstone, Speckled Wood, Orange-Tip, Peacock and Green Hairstreak. In poor weather, we’ll look at habitats, caterpillar food plants and nectar plants. Donations will be appreciated. |
| Booking details: | Ticket Tailor booking link |
| Date: | Sunday 10 MAY 2026 |
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| Event Title: | Guided butterfly walk at Hounslow Heath and Feltham Marshalling Yard to see spring heathland species - the target is Green Hairstreak and also Small Heath and Small Copper |
| Location: | Hounslow Heath Nature Reserve, nr. Hounslow (London Borough of Hounslow) |
| Address and/or grid ref: | Nearest postcode TW4 6AE. TQ119748 [Landranger Map 176] |
| Time/meeting place: | 11:00 at the Hounslow Heath Car Park, 450 Staines Road, TW4 5RB - approx. 2 hour duration to include walking to and from the Marshalling Yards |
| What3words: | https://w3w.co/tables.safely.once |
| Transport & directions: | Nearest underground station is Hounslow West (Piccadilly Line) - 25 minute walk. Local buses stop nearby (Frampton Road Bus Stop) |
| Information | No toilets or refreshments on site. Although the site is relatively flat, walking boots and long trousers are recommended. |
| Contact details | Paul Busby email: buzz113@hotmail.co.uk. |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Sunday 10 MAY 2026 * FULLY BOOKED - WAITING LIST ACTIVATED * |
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| Event Title: | Guided walk at Bovingdon Brickworks for spring butterflies including Dingy Skipper and day flying moths. For those interested this is also a good site for solitary bees and wasps as well as having a significant array of wildflowers. At the invitation of the Box Moor Trust. |
| Location: | Bovingdon Brickworks |
| Address and/or grid ref: | Carpark off Green Lane, Bovingdon - nearest postcode HP3 0NW. TL007032 [Landranger Map 165] |
| Time/meeting place: | 14:00 - Meet in the site carpark (see directions). Afternoon walk to finish approx. 16:00. |
| What3words: | https://w3w.co/legend.list.under |
| Transport & directions: | Nearest station is Hemel Hempstead approx. 3 miles (West Midlands Trains from London Euston) - taxi to site would be at least £10. Directions for the Brickworks Wildlife Site: - coming from the M25 leave at J20 onto A41 dual carriageway to Aylesbury. Leave at the next junction at Bourne End. At roundabout, take 2nd exit on to A4251 heading east on London Road towards Boxmoor and Hemel Hempstead. In about 1000 metres at the traffic lights turn right at the Swan Antique Centre on to B4505 / Box Lane. Drive straight on across mini roundabouts and a double roundabout (next to the Half Way House Pub) for a total of 2.7 miles. Then take the main turn on the left to Ley Hill and be ready to turn immediately left again on to Green Lane. In about 200 metres you will see a gateway on the right - hidden in the hedge - where there is small carpark. |
| Information | Most of the site is easy walking but the wilder bits has bramble that needs care to pass. There are a few steep sided dell holes (which do not have to be navigated) so if any children attend they need to be closely supervised. The site can be very muddy after rain so appropriate footwear is advised. |
| Contact details | Malcolm Hull (07768 154324) or email: malcolmhull@hertsmiddx-butterflies.org.uk. The Box Moor Trust reserve the right to cancel the event if weather conditions are considered unfavourable. Booking for this walk is required as numbers will be restricted. |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Tuesday 12 MAY 2026 |
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| Event Title: | Butterfly walk for Grizzled Skippers and to see the recent restoration work undertaken in the winter 2026. The walk is being organised by the Herts & Middlesex Wildlife Trust jointly with the branch. |
| Location: | Waterford Heath HMWT Reserve |
| Address and/or grid ref: | Carpark off Vicarage Lane, nearest postcode SG14 3LU, TL316150 [Landranger Map 166] |
| Time/meeting place: | 10:30 Reserve car park on Vicarage Lane to finish at approx. 12:30 |
| Transport & directions: | Nearest station is Hertford North (Great Northern from Moorgate) Then taxi or a 2-mile walk. Park in car park on Vicarage Lane which should be accessed by Sacombe Road, Hertford, not off the A119 through Waterford village. Sacombe Road can be accessed from the A602 between Ware and Watton at Stone or B158 through Hertford |
| Information | Join butterfly experts Andrew Wood and Liz Goodyear for a wildlife walk at Waterford Heath Nature Reserve, home to a wide variety of butterflies, moths and plants. We will particularly looking for the rare Grizzled Skipper butterfly. Sturdy footwear and we would recommend trousers due to brambles etc. No dogs allowed on this walk. |
| Contact details | 01727 858 901 or email: info@hmwt.org |
| Booking details: | Advance booking through will be required through this Eventbrite link The organisers reserve the right to cancel the event if weather conditions are considered unfavourable. |
| Date: | Saturday 16 MAY 2026 |
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| Event Title: | Guided walk for spring butterflies at Shrub Hill Common looking for Dingy Skipper and day flying moths |
| Location: | Shrub Hill Common, Hemel Hempstead |
| Address and/or grid ref: | Varney Road, Hemel Hempstead - nearest postcode HP1 2LR, TL035074 [Landranger Map 165] |
| Time/meeting place: | 14:00 - Meet at Common entrance off Varney Road to finish approx. 16:00. |
| What3words: | https://w3w.co/scar.ideas.globe |
| Transport & directions: | Nearest station is Hemel Hempstead approx. 1.25 miles (West Midlands Trains from London Euston). Directions for Varney Road: coming from the M25, use the left lane to take the A414 slip road to Hemel Hempstead, continue into Hemel Hempstead and after .5 miles turn left onto London Rd/A425; at the roundabout, take the 1st exit and stay on London Rd/A4251; at the roundabout, take the 2nd exit onto Fishery Rd and then at the next roundabout take the 1st exit onto Northridge Way. Go through 1 roundabout then at the next roundabout, take the 1st exit onto Long Chaulden, after 0.8 miles, and turn right into Varney Road. There will be some on street parking on the right side. |
| Information | Most of the site is easy walking. The site can be very muddy after rain so appropriate footwear is advised. |
| Contact details | Chris Ridley 07463821287 (on the day only) or email: chrisridley57@gmail.com |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Saturday 30 MAY * NEW * |
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| Event Title: | Guided late spring butterfly walk at Stafford Road Open Space at the invitation of the Ruislip & District & Hillingdon Natural History Societies * NEW * |
| Location: | Stafford Road Open Space in the London Borough of Hillingdon |
| Address and/or grid ref: | Start Point on Yeading Brook footpath TQ0960285505. [Landranger Map 176] |
| Time/meeting place: | Start 10:30 on Stafford Road Open Space at the sign post on the Yeading Brook footpath TQ0960285505. Finish at this location 13:00. For those arriving by train, bus, or parking in the stations small car park you may meet the leader earlier at the entrance to Ruislip Gardens Underground Station (Central Line) DEPARTING at 10:15 for the 600m walk along the Yeading Brook to the event start point where we will meet those that have made their own way there. |
| What3words: | Stafford Road Open Space Meeting point - https://w3w.co/daring.sticks.eaten Google GPS co-ordinates 51°33'28.3"N 0°25'13.2"W |
| Transport & directions: | On Central Line, also E7 bus (every 20 minutes) from Ruislip (Metropolitan & Piccadilly) to Ealing Broadway (District and National rail). Very limited pay and display parking at station, some off-street parking plus car parks at Sidmouth Drive (HA4 ODA) and Ruislip Gardens shops at New Pond Parade, West End Road (HA4 6LR). |
| Information | Join Dick Middleton for bank holiday weekend walk around Stafford Road Open Space looking for late spring butterflies. |
| Contact details | Dick Middleton mobile no: 07597 369067 or email Dick Middleton |
| Booking details: | No booking required |
| Date: | Saturday 30 MAY 2026 |
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| Event Title: | Guided butterfly walk at Heartwood Forest - looking for the rare Small Blue butterfly ~ organised by the Woodland Trust. This is a very popular walk and unfortunately places will be limited |
| Location: | Heartwood Forest |
| Address and/or grid ref: | Heartwood Forest, carpark off the B651, Sandridge AL4 9DQ |
| Time/meeting place: | 11:00 - 13:00 |
| What3words: | https://what3words.com/cheat.post.half |
| Transport & directions: | Nearest station St Albans City (Thameslink from London St Pancras Intl.) approx. 2.45 miles. There are two bus services which stop at Sandridge, one from Hitchin to Potters Bar (via St Albans) and one from Hemel Hempstead to Hatfield via Harpenden. Directions from the south. Head north from St Albans along the B651 towards Wheathampstead. Pass through the village of Sandridge along the main road and turn left at the brown road sign for Heartwood Forest (TL172110). Park in the main car park, situated off the B651, (Postcode AL4 9DQ). |
| Information | Guided walk in Heartwood Forest with local butterfly experts Andrew Steele and Malcolm Hull. We will look for a range of species including the rare Small Blue. |
| Contact details | Andrew Steele & Malcolm Hull (07768 154324) or email: malcolmhull@hertsmiddx-butterflies.org.uk |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Saturday 8 to Sunday 14 JUNE 2026 |
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| Event Title: | Great Big Green Week * NEW * |
| Information: | The 2026 Great Big Green Week (GBGW) will be taking place throughout our branch area between Saturday 6th JUNE and Sunday 14th JUNE |
| Location of branch events on the 8th JUNE: | St. Marys Church, Watford for more information Fletcher's Lea Hall, next to Ware Priory 11:00 to 16:00 |
| Details | More information can be found here |
| Date: | Monday 22 - Sunday 28 JUNE 2026 |
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| Event Title: | Insect Week 2026 |
| Information | Royal Entomological Society Insect Week runs from Monday 22 JUNE to Sunday 28 JUNE 2026. Events are organised across our branch area |
| Details | Full details and list of events are available here |
| Date: | Sunday 21 JUNE 2026 * NEW * |
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| Event Title: | Butterfly walk for summer butterflies and day-flying moths and other grassland species - with the Letchworth Garden City Heritage Trust - part of the Discover Letchworth Festival Programme of events |
| Location: | Fields off Hillbrow, Letchworth |
| Address and/or grid ref: | TL207319 [Landranger Map 166] or postcode SG6 3RF |
| Time/meeting place: | 15:00 meeting at the top of the field next to the playground which is down a small entrance road off Hillbrow (Between house numbers 55 and 57) in Letchworth. This entry road is signposted for the Letchworth Garden City Greenway and leads past some garages and a playground through an accessible gate. Approx. 1 1/2 hours walk |
| What3words: | https://w3w.co/cage.torn.maps |
| Transport & directions: | Nearest station: Letchworth Garden City station (Thameslink from London King's Cross. Hillbrow can be accessed from the town centre down Station Way, and High Avenue and Burnell Rise. There is no car park and these are narrow suburban roads so you may have to park a little way away. The nearest bus is 53 operated by Landmark Coaches. This goes from Letchworth Station to Grange Estate every hour, the nearest stop is West Road a 0.3 mile walk from the entrance to the site. |
| Information | Join Andrew Wood for a guided walk around this excellent butterfly and day-flying moth site. Generally easy walking but wear reasonable footwear as there may be some mud and grassland may be damp. No dogs allowed on this walk. |
| Contact & booking details | https://www.discoverletchworth.co.uk/festival/ |
| Date: | Thursday 25 JUNE 2026 * NEW * |
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| Event Title: | Butterfly walk at Chorleywood Common for early summer grassland species and day-flying moths including hopefully the very rare Forester moth |
| Location: | Chorleywood Common, Chorleywood |
| Address and/or grid ref: | Nearest postcode WD3 5FL. TQ032966 [Landranger Map 176] |
| Time/meeting place: | 10:30 - 13:00 approx. Meet in the main carpark on the north side of the Common along the Rickmansworth Road (just after the Cricket Club). Approx. 2 ½ hour walk |
| What3words: | https://w3w.co/offers.gear.sticks |
| Transport & directions: | Nearest station is Chorleywood (Metropolitan Line). Please consult a map for walking directions to the meeting point which is a 20 minute brisk walk uphill! |
| Information | Generally easy walking but wear reasonable footwear as there may be some mud and grassland may be damp. No dogs allowed on this walk. |
| Contact details | Philip Gibbs ~ 07759 958804 or email: philip.gibbs2@gmail.com |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Saturday 27 JUNE 2026 * NEW * |
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| Event Title: | Guided butterfly walk and examining the contents of the previous night's moth trap at the invitation of Holland Park Ecology Centre lead by Andrew Wood |
| Location: | Holland Park (The Royal Borough of Kensington and Chelsea) |
| Address and/or grid ref: | 10:00 - 11:30 at Holland Park Ecology Centre. At the western side of Holland Park by the adventure playground and next to the Abbotsbury Road Car Park. Entrance to the park is via Ilchester Place Gate, Abbotsbury Road Car Park, the Duchess of Bedford Gate or from Holland Walk and Holland Park Avenue. |
| Time: | Bus routes that serve Holland Park are 9, 23, 27, 28, 49, 328 and C1 (Kensington side) and 31, 94, 148, 228 (Holland Park Station side). London Underground stations: Holland Park (Central line) and Kensington High Street (Circle and District). Overground station: Kensington (Olympia) |
| Transport: | Nearest station is King's Cross |
| Information: | We strongly advise using public transport if possible - this is a free event but booking is essential |
| Booking details: | Advance booking through Eventbrite will be required via this link |
| Date: | Saturday 27 JUNE 2026 * NEW * |
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| Event Title: | Guided walk at Heartwood Forest to look for summer butterflies including Purple Emperor ~ organised by the Woodland Trust. |
| Location: | Heartwood Forest |
| Address and/or grid ref: | Heartwood Forest, carpark off the B651, Sandridge AL4 9DQ |
| Time/meeting place: | 11:00 to 14:00 |
| What3words: | https://what3words.com/cheat.post.half |
| Transport: | Nearest station St Albans City (Thameslink from London St Pancras Intl.) approx. 2.45 miles. There are two bus services which stop at Sandridge, one from Hitchin to Potters Bar (via St Albans) and one from Hemel Hempstead to Hatfield via Harpenden. |
| Directions: | Directions from the south. Head north from St Albans along the B651 towards Wheathampstead. Pass through the village of Sandridge along the main road and turn left at the brown road sign for Heartwood Forest (TL172110). Park in the main car park, situated off the B651, (Postcode AL4 9DQ). |
| Information: | Guided walk in Heartwood Forest with our local butterfly experts Andrew Steele and Malcolm Hull. We will look for a range of woodland & grassland species including the elusive Purple Emperor. Voluntary donation of £5 payable to the Woodland Trust |
| Contact details: | Malcolm Hull ~ 07768 154324 or email: malcolmhull@hertsmiddx-butterflies.org.uk |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Saturday 27 JUNE 2026 * NEW * |
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| Event Title: | Guided butterfly walk to visit Butterfly Conservation's only reserve in the Herts & Middlesex area and see a range of summer butterflies and look at the moths recorded the previous night. |
| Location: | Millhoppers Pasture Reserve. |
| Address and/or grid ref: | Postcode HP23 4PE - SP903142 [Landranger Map 165] (Please note this is the grid reference of the meeting place not the Reserve) |
| Time/meeting place: | 10:30 at Wilstone Village Hall for a short walk across the fields to the Reserve. Walk to last approx. 2 hours after the moths have been looked at. |
| What3words: | Meeting place https://w3w.co/serenade.busy.guard |
| Transport & directions: | Nearest railway stations: Tring (West Midlands Trains from London Euston) or Wendover (Chiltern Railways from London Marylebone) |
| Information | Suitable for children and an ideal opportunity to develop Butterfly identification skills. |
| Contact details | Email: millhoppers@hertsmiddx-butterflies.org.uk or on the day Chris Ridley ~ 07463 821287 |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Sunday 28 JUNE 2026 *NEW * |
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| Event Title: | Butterfly Walk for early summer butterflies with the Friends of Cassiobury Park and Watford Borough Council. |
| Location: | Whippendell Woods |
| Address and/or grid ref: | Cassiobury Park, Gade Avenue, Watford WD18 7LG. TQ091973 [Landranger Map 166] |
| Time/meeting place: | 14:00 - 16:00 meet just into the park from the entrance opposite Langley Way, WD18 3BD |
| What3words: | https://what3words.com/match.case.bliss |
| Transport & directions: | Cassiobury Park is a 2 minute walk from the Watford Metropolitan line station. Exit the station onto Cassiobury Park Avenue and turn right, after about 150 metres turn left onto Shepherds Road - the park is straight ahead of you. Alternatively Watford Junction (1.3 miles) and Watford High Street (2.1 miles) are the two closest Overground stations. There is one official car park for Cassiobury Park at the end of Gade Avenue near the bottom of Cassiobury Park Avenue (WD18 7LG is the nearest postcode). It should be noted that the car park does get very busy if the weather is good and there is a small charge these days. So best to arrive early to avoid parking problems. There is street parking at weekends along the roads off Langley Way, such as Parkside Drive. |
| Information: | There are toilets at the ‘Hub’ although the café in the park can get quite busy therefore it is suggested you bring your own refreshments. |
| Contact details: | Peter Fewell ~ 07814 282356 or email: p.fewell@yahoo.com |
| Booking details: | Advance booking through Eventbrite will be required through this link |
| Date: | Wednesday 16 JULY 2026 * NEW * |
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| Event Title: | An early morning walk at Claybury Park looking for the elusive Brown Hairstreak at the invitation of Cambs & Essex Branch of Butterfly Conservation. |
| Location: | Claybury Park, Woodford Bridge, London Borough of Redbridge |
| Address and/or grid ref: | Nearest postcode IG8 8NQ - TQ4248391229 [Landranger Map 177 or 167] |
| Time/meeting place: | 08:30 - 12:00 - Please meet outside the gates to the park on Roding Lane North at TQ4248391229 (just south of the junction with Vicarage Road). There is plenty of unrestricted free parking along Roding Lane North |
| What3words: | https://w3w.co/offers.forms.loaded |
| Transport & directions: | Woodford Green tube station (Central Line) is a 15-20 minutes' walk from the meeting point. |
| Information | The Brown Hairstreak had been missing from the Cambridgeshire & Essex Branch area for generations eggs were discovered in Claybury Park in December 2022. This last winter, there was a very strong egg count which suggests that Brown Hairstreak is now well established at Claybury Park. Join us for an early start to try and see this beautiful and elusive butterfly. This guided walk will locate likely assembly trees to catch the morning activity of the Brown Hairstreak males. Along the way we will be keeping an eye out for any females that may be lower down on blackthorn or nectaring on adjacent flowers. |
| Contact details | Ian Watts - see email below for all communications |
| Booking details: | The walk is limited to 10 attendees - please contact Ian Watts ian@ianwatts.co.uk to confirm your place |
*The Branch sells the FSC Identification Guide to Butterflies. Contact Malcolm Hull for more information (07768 154324 or email: malcolmhull@hertsmiddx-butterflies.org.uk)
Children
Children are welcome at our events, but if under 16 they must be accompanied by at least one adult for two children. It is the responsibility of the accompanying adult(s) to ensure that the event is within the children's ability.
Dogs
Dogs are normally welcome on walks but must be kept under control. Any exceptions are shown in the individual event details.
Bad weather
Leaders of Branch-led walks will be at the meeting point whatever the weather, but may cancel the event if conditions are unsuitable. Any exceptions are shown in the individual event details. Other organisations and BC branches have different policies. Please contact the named leader for the walk before travelling if you have any concerns.
Lyme Disease
We recommend that all attendees understand the symptoms of Lyme Disease and take the relevant precautions. For more information visit the branch website -
here
Special needs
Unfortunately, most walks will not be suitable for wheelchair users and pushchairs. Please contact the named leader in advance if you have any concerns about accessibility.
What3words
We have tried to include the What3word link for each event. To download the App visit: https://what3words.com/products/what3words-app
Public Transport
We aim to give as much information as possible, although unfortunately some of the Hertfordshire events are not easily accessible by public transport. Train times should be checked, as timetables change and engineering works take place on Saturdays and Sundays. We recommend using public transport for all events in London.
If using your car please check you are ULEZ compliant https://tfl.gov.uk/modes/driving/ultra-low-emission-zone