Which Dorset butterflies emerged when?
These are the earliest dates on which each species of adult butterfly was reported to the website.
| Species | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adonis Blue | 04 May | 07 May | 12 May | 29 Apr | 14 May | 08 May | 27 Apr | 07 May | 30 Apr | 13 May | 17 May | 30 Apr |
| American Painted Lady | - | - | - | - | - | - | - | - | - | - | - | 22 Sep |
| Brimstone | 09 Jan | 08 Jan | 17 Jan | 04 Feb | 28 Jan | 14 Feb | 19 Jan | 22 Jan | 12 Jan | 02 Jan | 24 Jan | 14 Jan |
| Brown Argus | 03 May | 30 Apr | 06 May | 29 Apr | 07 May | 20 Apr | 19 Apr | 26 Apr | 23 Apr | 03 May | 4 May | 27 Apr |
| Brown Hairstreak | 12 Jul | 21 Jul | 20 Jul | 12 Jul | 15 Jul | 20 Jul | 12 Jul | 20 Jul | 18 Jul | 16 Jul | 10 Jul | 04 Jul |
| Camberwell Beauty | - | - | - | - | - | - | - | - | - | 18 Jul | - | - |
| Chalkhill Blue | 30 Jun | 24 Jun | 12 Jul | 06 Jul | 02 Jul | 14 Jul | 06 Jul | 16 Jul | 27 Jun | 10 Jul | 14 Jul | 04 Jul |
| Clouded Yellow | 13 Apr | 06 Apr | 25 Mar | 26 Mar | 18 Apr | 24 Feb | 19 Apr | 19 Mar | 13 Apr | 02 Jan | 09 May | 13 Jun |
| Comma | 08 Mar | 18 Mar | 14 Mar | 18 Feb | 15 Mar | 14 Feb | 19 Jan | 26 Feb | 12 Jan | 14 Mar | 26 Jan | 09 Mar |
| Common Blue | 11 Apr | 19 Apr | 06 May | 14 Apr | 30 Apr | 29 Apr | 26 Apr | 02 May | 25 Apr | 07 May | 11 May | 26 Apr |
| Dark Green Fritillary | 08 Jun | 06 Jun | 27 Jun | 30 May | 02 Jun | 14 Jun | 25 May | 07 Jun | 01 Jun | 05 Jun | 25 Jun | 12 May |
| Dingy Skipper | 15 Apr | 17 Apr | 28 Apr | 18 Apr | 30 Apr | 19 Apr | 14 Apr | 19 Apr | 15 Apr | 01 May | 07 May | 09 Apr |
| Duke of Burgundy | 03 May | 12 May | 13 May | 23 Apr | 07 May | 04 May | 02 May | 24 Apr | 26 Apr | 07 May | 07 May | 01 May |
| Essex Skipper | 21 Jun | 24 Jun | 06 Jul | 26 Jun | 22 Jun | 14 Jun | 14 Jun | 25 Jun | 20 Jun | 15 Jun | 29 Jun | 17 Jun |
| Gatekeeper | 28 Jun | 24 Jun | 25 May | 13 Jun | 20 Jun | 28 Jun | 09 Jun | 24 Jun | 20 Jun | 18 Jun | 13 Jun | 08 Jun |
| Glanville Fritillary | - | - | - | - | - | 01 Jun | - | 30 May | 13 May | 20 May | 19 May | 26 Apr |
| Grayling | 29 Jun | 24 Jun | 05 Jul | 18 Jun | 23 Jun | 27 Jun | 14 Jun | 30 Jun | 26 Jun | 19 Jun | 26 Jun | 14 Jun |
| Green Hairstreak | 10 Apr | 13 Apr | 09 Apr | 07 Apr | 25 Apr | 15 Apr | 08 Apr | 04 Apr | 16 Apr | 23 Apr | 18 Apr | 09 Apr |
| Green-veined White | 01 Apr | 08 Apr | 11 Apr | 03 Apr | 14 Apr | 24 Mar | 16 Mar | 04 Apr | 14 Mar | 08 Apr | 30 Mar | 31 Mar |
| Grizzled Skipper | 15 Apr | 16 Apr | 20 Apr | 09 Apr | 20 Apr | 19 Apr | 08 Apr | 17 Apr | 15 Apr | 29 Apr | 24 Apr | 04 Apr |
| Holly Blue | 08 Mar | 06 Apr | 12 Apr | 25 Mar | 05 Apr | 12 Feb | 25 Mar | 04 Apr | 22 Mar | 6 Apr | 01 Apr | 30 Mar |
| Large Skipper | 26 May | 28 May | 26 May | 24 May | 26 May | 26 May | 07 May | 29 May | 17 May | 25 May | 12 May | 07 May |
| Large Tortoiseshell | - | - | - | - | - | 24 Feb | 03 Mar | 26 Feb | 19 Mar | 04 Apr | - | 19 Mar |
| Large White | 13 Apr | 05 Apr | 31 Mar | 30 Mar | 17 Apr | 24 Mar | 24 Mar | 03 Apr | 25 Mar | 14 Feb | 17 Apr | 31 Mar |
| Long-tailed Blue | - | 29 Aug | 12 Sep | - | - | 03 Aug | 10 Aug | - | 10 Sep | 15 Sep | 18 Sep | - |
| Lulworth Skipper | 21 May | 21 May | 27 May | 10 May | 18 May | 11 May | 19 May | 26 May | 14 May | 13 May | 19 May | 02 May |
| Marbled White | 08 Jun | 11 Jun | 07 Jun | 04 Jun | 06 Jun | 05 Jun | 19 May | 11 Jun | 01 Jun | 08 Jun | 05 Jun | 25 May |
| Marsh Fritillary | 06 May | 04 May | 08 May | 10 May | 14 May | 06 May | 26 Apr | 10 May | 05 May | 12 May | 11 May | 27 Apr |
| Meadow Brown | 01 Jun | 04 Jun | 14 May | 24 May | 27 May | 30 May | 17 May | 06 Jun | 24 May | 29 May | 27 May | 02 May |
| Monarch | - | - | - | - | - | - | - | - | - | 14 Oct | - | - |
| Orange Tip | 30 Mar | 19 Mar | 11 Apr | 28 Mar | 14 Apr | 24 Mar | 26 Mar | 27 Mar | 19 Mar | 27 Mar | 24 Mar | 30 Mar |
| Painted Lady | 01 Mar | 11 Apr | 03 Jan | 16 Feb | 22 Apr | 09 Jan | 03 Apr | 22 Feb | 15 Mar | 02 Jan | 26 Jan | 25 Feb |
| Peacock | 02 Jan | 09 Jan | 15 Feb | 19 Jan | 12 Jan | 01 Jan | 05 Jan | 05 Feb | 11 Jan | 02 Jan | 07 Jan | 03 Feb |
| Purple Emperor | 05 Jul | 18 Jul | 13 Jul | 08 Jul | 26 Jun | 18 Jun | 23 Jun | 16 Jul | 28 Jun | 28 Jun | 31 Jul | 29 Jun |
| Purple Hairstreak | 22 Jun | 01 Jul | 22 Jun | 17 Jun | 17 Jun | 20 Jun | 07 Jun | 22 Jun | 15 Jun | 14 Jun | 19 Jun | 14 Jun |
| Red Admiral | 08 Jan | 02 Jan | 06 Jan | 04 Jan | 05 Jan | 01 Jan | 02 Jan | 20 Jan | 01 Jan | 02 Jan | 03 Jan | 02 Jan |
| Ringlet | 20 Apr | 21 May | 16 Jun | 10 Jun | 10 Jun | 18 Jun | 05 Jun | 23 Jun | 10 Jun | 18 Jun | 05 Jun | 07 Jun |
| Silver-spotted Skipper | 30 Jul | 08 Aug | 06 Aug | 06 Aug | 02 Aug | 28 Jul | 03 Aug | 04 Aug | 01 Aug | 10 Aug | 09 Aug | 25 Jul |
| Silver-studded Blue | 08 Jun | 08 Jun | 06 Jun | 03 Jun | 08 Jun | 01 Jun | 25 May | 09 June | 29 May | 07 Jun | 07 Jun | 16 May |
| Silver-washed Fritillary | 15 Jun | 24 Jun | 21 Jun | 14 Jun | 21 Jun | 26 Jun | 07 Jun | 27 May | 14 Jun | 17 Jun | 25 Jun | 09 Jun |
| Small Blue | 06 May | 28 Apr | 23 Apr | 21 Apr | 13 May | 04 May | 25 Apr | 11 May | 22 Apr | 10 May | 07 May | 27 Apr |
| Small Copper | 30 Mar | 12 Apr | 18 Apr | 27 Mar | 18 Apr | 26 Mar | 24 Mar | 02 Apr | 03 Apr | 25 Mar | 27 Apr | 31 Mar |
| Small Heath | 29 Apr | 29 Apr | 06 May | 18 Apr | 07 May | 19 Apr | 22 Apr | 26 Apr | 26 Apr | 07 May | 04 May | 09 Apr |
| Small Pearl-bordered Fritillary | 07 Jun | 13 Jun | 10 Jun | 04 Jun | 11 Jun | 09 Jun | 27 May | 13 Jun | 11 Jun | - | - | - |
| Small Skipper | 13 Jun | 08 Jun | 20 Jun | 12 Jun | 28 May | 01 Jun | 27 May | 20 Jun | 08 Jun | 02 Jun | 03 Jun | 20 May |
| Small Tortoiseshell | 09 Jan | 02 Jan | 06 Jan | 18 Jan | 16 Feb | 13 Jan | 19 Jan | 26 Feb | 30 Jan | 03 Jan | 26 Jan | 01 Mar |
| Small White | 01 Mar | 22 Mar | 10 Mar | 13 Mar | 26 Mar | 24 Mar | 01 Mar | 09 Mar | 12 Mar | 14 Mar | 03 Mar | 04 Mar |
| Speckled Wood | 07 Feb | 06 Mar | 25 Mar | 25 Mar | 16 Apr | 24 Mar | 21 Mar | 27 Feb | 04 Mar | 19 Jan | 30 Jan | 09 Mar |
| Swallowtail | 02 Jul | 15 Aug | - | - | - | 05 Aug | 09 Aug | 10 Jun | 22 May | - | - | 16 Jul |
| Wall Brown | 14 Apr | 19 Apr | 17 Apr | 19 Apr | 04 May | 13 Apr | 08 Apr | 24 Apr | 15 Apr | 07 Apr | 28 Apr | 10 Apr |
| White Admiral | 18 Jun | 24 Jun | 21 Jun | 14 Jun | 15 Jun | 26 Jun | 04 Jun | 15 Jun | 15 Jun | 10 Jun | 16 Jun | 03 Jun |
| White-letter Hairstreak | 14 Jun | 25 Jun | 02 Jul | 15 Jun | 18 Jun | 24 Jun | 15 Jun | 28 Jun | 15 Jun | 12 Jun | 17 Jun | 13 Jun |
| Wood White | - | - | - | 26 May | 09 Jul | - | 19 Apr | 27 Apr | 26 Apr | 17 May | 08 May | 27 Apr |
