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Butterfly Conservation
Hertfordshire & Middlesex Branch
Saving butterflies, moths and our environment

First Sightings in Hertfordshire and Middlesex

Here are the earliest sightings of our resident and migrant butterflies
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For information at a national level. . . .
Butterfly Conservation First Sightings 2018

35 species of butterfly occur most years in Hertfordshire and 30 in Middlesex, together with the occasional migrant or vagrant. The following table lists the first and last sightings in the two counties :

Species County Date 2011 2012 2013 2014 2015 2016 2017 2018
Dingy Skipper
Erynnis tages
Herts First 21-Apr 8-May 6-May 28-Apr 21-Apr 3-May 5-May 6-May
Last21-May
Middx First
Last
Grizzled Skipper
Pyrgus malvae
Herts First 9-Apr 4-Apr 24-Apr 15-Apr 21-Apr 12-Apr 8-Apr 1-May
Last1-Jun
Middx First
Last
Essex Skipper
Thymelicus lineola
Herts First 20-Jun 7-Jul 6-Jul 20-Jun 24-Jun 3-Jul 19-Jun 28-Jun
Last27-Jul
Middx First 25-Jun 7-Jul 9-Jul 18-Jun 25-Jun 1-Jul 18-Jun 24-Jun
Last19-Jul
Small Skipper
Thymelicus sylvestris
Herts First 11-Jun 30-Jun 29-Jun 17-Jun 23-Jun 6-Jun 13-Jun 18-Jun
Last27-Jul
Middx First 11-Jun 27-Jun 4-Jul 17-Jun 17-Jun 19-Jun 11-Jun 10-Jun
Last21-Jul
Large Skipper
Ochiodes sylvanus
Herts First 8-May 9-Jun 7-Jun 31-May 4-Jun 27-May 27-May 27-May
Last25-Jul
Middx First 7-May 6-Jun 6-Jun 31-May 26-May 26-May 27-May 28-May
Last21-Jul
Orange-tip
Anthocharis cardamines
Herts First 6-Apr 24-Mar 21-Apr 31-Mar 6-Apr 5-Apr 30-Mar 14-Apr
Last28-May
Middx First 23-Mar 24-Mar 29-Apr 20-Mar 7-Apr 12-Apr 25-Mar 14-Apr
Last1-Jun
Large White
Pieris brassicae
Herts First 6-Apr 29-Mar 21-Apr 9-Mar 10-Apr 14-Apr 8-Apr 17-Apr
Last3-Nov
Middx First 22-Apr 27-Mar 24-Apr 8-Apr 10-Apr 30-Apr 19-Apr 18-Apr
Last14-Oct
Small White
Pieris rapae
Herts First 6-Apr 23-Mar 14-Apr 24-Mar 6-Apr 25-Mar 30-Mar 17-Apr
Last27-Oct
Middx First 23-Marr 15-Mar 20-Apr 6-Mar 22-Mar 22-Mar 9-Mar 26-Mar
Last19-Oct
Green-veined White
Pieris napi
Herts First 12-Mar 26-Mar 21-Apr 16-Mar 14-Apr 13-Apr 2-Apr 17-Apr
Last24-Sep
Middx First 23-Mar 15-Mar 21-Apr 1-Aprr 10-Apr 2-Apr 2-Apr 17-Apr
Last3-Oct
Clouded Yellow
Colias croceus
Herts First 3-Jul 25-Jun 24-Jul 9-Jun 26-Jun 16-Jun 31-Jul
Last5-Nov
Middx First 1-Sep 26-Jun 26-Jun 10-Jul 26-Jul 9-Jul
Last2-Oct
Brimstone
Gonepteryx rhamni
Herts First 8-Feb 23-Feb 19-Feb 22-Feb 25-Feb 4-Feb 17-Feb 10-Jan
Last15-Oct
Middx First 8-Feb 15-Mar 5-Mar 24-Feb 15-Jan 13-Mar 17-Feb 14-Mar
Last12-Oct
Speckled Wood
Pararge aegeria
Herts First 7-Apr 23-Mar 25-Apr 2-Apr 10-Mar 4-Jan 15-Mar 18-Apr
Last3-Nov
Middx First 2-Apr 12-Mar 24-Apr 1-Apr 7-Apr 8-Apr 2-Apr 25-Jan
Last10-Nov
Small Heath
Coenonympha pamphilus
Herts First 24-Apr 11-May 12-May 4-May 10-May 14-May 22-Apr 9-May
Last31-Aug
Middx First 30-Apr 13-May 26-May 16-May 4-May 12-May 10-May 17-May
Last23-Sep
Ringlet
Aphantopus hyperantus
Herts First 9-Jun 18-Jun 26-Jun 8-Jun 22-Jun 21-Jun 7-Jun 10-Jun
Last13-Aug
Middx First 24-Jun 27-Jun 29-Jun 17-Jun 17-Jun 17-Jun 10-Jun 8-Jun
Last21-Jul
Meadow Brown
Maniola jurtina
Herts First 25-May 10-Jun 19-Jun 2-Jun 4-Jun 6-Jun 29-May 31-May
Last24-Sep
Middx First 24-May 14-Jun 19-Jun 5-Jun 6-Jun 9-Jun 30-May 31-May
Last16-Oct
Gatekeeper
Pyronia tithonus
Herts First 25-Jun 12-Jul 13-Jul 26-Jun 2-Jul 8-Jul 25-Jun 27-Jun
Last26-Aug
Middx First 25-Jun 10-Jul 10-Jul 27-Jun 29-Jun 2-Jul 23-Jun 24-Jun
Last7-Sep
Marbled White
Melanargia galathea
Herts First 13-Jun 18-Jun 26-Jun 10-Jun 16-Jun 18-Jun 10-Jun 13-Jun
Last27-Jul
Middx First 9-Jun 27-Jun 4-Jul 19-Jun 17-Jun 16-Jun 10-Jun 14-Jun
Last16-Jul
Silver-washed Fritillary
Argynnis paphia
Herts First 19-Jun 1-Jul 6-Jul 20-Jun 29-Jun 1-Jul 7-Jun 10-Jun
Last13-Aug
Middx First 27-Jun 26-Jul 2-Aug 23-Jun 10-Jul 16-Jul 26-Jun
Last5-Aug
Dark Green Fritillary
Argynnis aglaja
Herts First 3-Jun 25-Jun 16-Jun 10-Jun 16-Jun 19-Jun 13-Jun 16-Jun
Last27-Jul
Middx First 13-Jul 24-Jul 27-Jun
Last
White Admiral
Limentitis camilla
Herts First 11-Jun 27-Jun 5-Jul 13-Jun 27-Jun 28-Jun 15-Jun 13-Jun
Last29-Jul
Middx First 9-Jun 13-Jul 5-Jul 22-Jun 29-Jun 6-Jul 19-Jun 18-Jun
Last5-Jul
Purple Emperor
Apatura iris
Herts First 21-Jun 4-Jul 12-Jul 20-Jun 5-Jul 4-Jul 20-Jun
Last17-Jul
Middx First 25-Jun 5-Jul 9-Jul 21-Jun 30-Jun 4-Jul 18-Jun 19-Jun
Last14-Jul
Red Admiral
Vanessa atalanta
Herts First 8-Feb 2-Jan 4-Jan 22-Feb 9-Jan 13-Mar 24-Jan 2-Feb
Last26-Nov
Middx First 19-Jan 16-Feb 12-Jan 2-Jan 18-Feb 25-Jan 2-Jan 2-Jan
Last26-Nov
Painted Lady
Vanessa cardui
Herts First 22-Apr 8-May 18-Jun 24-May 21-Apr 16-May 6-Apr 27-May
Last26-Aug
Middx First 6-Apr 1-Jul 1-Jul 15-Apr 13-May 14-May 18-May 21-Apr
Last22-Sep
Peacock
Aglais io
Herts First 12-Mar 1-Mar 19-Feb 3-Jan 8-Feb 21-Mar 26-Feb 14-Mar
Last22-Sep
Middx First 12-Mar 26-Feb 10-Apr 24-Feb 7-Jan 22-Mar 9-Mar 16-Mar
Last22-Nov
Small Tortoiseshell
Aglais urticae
Herts First 7-Mar 9-Jan 19-Feb 16-Feb 8-Feb 30-Jan 5-Jan 17-Feb
Last3-Nov
Middx First 12-Mar 24-Feb 5-Mar 5-Mar 6-Mar 17-Mar 9-Mar 26-Mar
Last7-Sep
Camberwell Beauty
Nymphalis antiopa
Herts First 11 Aug
Last
Middx First
Last
Comma
Polygonia c-album
Herts First 7-Mar 10-Mar 3-Mar 26-Feb 7-Mar 14-Mar 9-Mar 16-Mar
Last26-Nov
Middx First 8-Mar 26-Feb 6-Apr 24-Feb 7-Mar 22-Mar 17-Feb 11-Mar
Last23-Nov
Small Copper
Lycaena phlaeas
Herts First 21-Apr 30-Apr 20-May 27-Apr 27-Apr 4-May 18-Apr 9-May
Last3-Nov
Middx First 21-Apr 12-May 25-May 21-Apr 7-May 5-May 25-Apr 14-May
Last13-Nov
Brown Hairstreak
Thecula betulae
Herts First
Last
Middx First 19-Jul
Last
Purple Hairstreak
Favonius quercus
Herts First 11 May 4-Jul 8-Jul 26-Jun 1-Jul 26-Jun 20-Jun 20-Jun
Last6-Aug
Middx First 13-Jun 8-Jul 4-Jul 26-Jun 1-Jul 26-Jun 20-Jun 14-Jun
Last23-Aug
Green Hairstreak
Callophrys rubi
Herts First 10-Apr 12-May 1-May 16-Apr 20-Apr 3-May 9-Apr 21-Apr
Last21-May
Middx First 6-May 3-May 3-May 18-Apr 7-May 8-Apr 21-Apr
Last28-May
White-letter Hairstreak
Satyrium w-album
Herts First 4-Jun 25-Jun 5-Jul 17-Jun 24-Jun 26-Jun 14-Jun 15-Jun
Last21-Jul
Middx First 30-May 23-Jun 6-Jul 15-Jun 24-Jun 25-Jun 9-Jun 31-May
Last17-Jul
Small Blue
Cupido minimus
Herts First 21-May 30-May 4-Jun 14-May 13-May 12-May 5-May 15-May
Last6-Aug
Middx First 21-May
Last
Holly Blue
Celastrina argiolus
Herts First 23-Mar 9-Mar 2-Apr 3-Apr 7-Apr 22-Mar 26-Mar 14-Apr
Last6-Dec
Middx First 22-Mar 24-Mar 20-Apr 16-Mar 6-Apr 13-Apr 25-Mar 17-Apr
Last18-Nov
Brown Argus
Aricia agestis
Herts First 24-Apr 7-May 22-May 6-May 10-May 11-May 3-May 14-May
Last2-Sep
Middx First 9-May 22-May 2-Jul 16-May 21-May 17-May 14-May 17-May
Last27-Oct
Common Blue
Polyommatus icarus
Herts First 18-Apr 22-May 31-May 6-May 10-May 17-May 10-May 18-May
Last17-Sep
Middx First 4-May 19-May 4-Jun 14-May 10-May 15-May 14-May 19-May
Last8-Oct
Chalkhill Blue
Polyommatus coridon
Herts First 3-Jul 12-Jul 8-Jul 26-Jun 29-Jun 2-Jul 24-Jun 30-Jun
Last29-Jul
Middx First 22-Jul 23-Jul
Last

The first and last sightings are gathered as the current butterfly season progresses so as to provide up-to-date information about species emergence. For previous years the first and last dates will be the actual dates as recorded on our branch database when they become available; empty entries indicate absence.


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