First sightings - Herts & Middx Butterfly Conservation

First Sightings in Hertfordshire and Middlesex


Last updated 4 January 2026

First and last sightings in 2014-2023

Butterfly Conservation First Sightings 2025

Species 2015-24 average 2025 2026
Adonis Blue 24 May ⁰ 15 May
Brimstone 28 January 24 February
Brown Argus 3 May 24 April
Brown Hairstreak 19 July ⁱ 1 July
Camberwell Beauty
Chalk Hill Blue 29 June 25 June
Clouded Yellow 10 June 16 June
Comma 6 February 3 March
Common Blue 3 May 28 April
Dark Green Fritillary 21 June 1 June
Dingy Skipper 3 May 25 April
Essex Skipper 19 June 17 June
Gatekeeper 22 June 10 June
Green-veined White 30 March 26 March
Green Hairstreak 20 April 27 April
Grizzled Skipper 19 April 9 April
Holly Blue 16 March 26 March
Large Skipper 29 May 29 April
Large White 29 March 20 March
Marbled White 8 June 31 May
Meadow Brown 30 May 22 May
Orange-tip 8 April 31 March
Painted Lady 10 April 11 May
Peacock 29 January 21 February
Purple Emperor 24 June 19 June
Purple Hairstreak 16 June 9 June
Red Admiral 19 January 25 January
Ringlet 12 June 5 June
Silver-washed Fritillary 17 June 13 June
Small Blue 8 May 2 May
Small Copper 22 April 12 April
Small Heath 30 April 25 April
Small Skipper 9 June 31 May
Small Tortoiseshell 30 January 4 March
Small White 18 March 19 March
Speckled Wood 4 March 26 March
White Admiral 18 June 12 June
White-letter Hairstreak 12 June 2 June

⁰ - 2019-2024
ⁱ - 2018-2024