Butterfly First Sightings in 2025 (species this year: 35)

This page shows the earliest sightings of butterflies in the Upper Thames region (per UTB Sightings). The "+- days" column shows the difference from the mean first sighting date in the UTB region since 2004.
# Species Date Recorder Location +- days
35 White-letter Hairstreak 10th June Adrian Cadman Great Linford, Bucks -9 days
34 White Admiral 6th June Colin Williams Whitecross Green Wood, Oxon -10 days
33 Silver-studded Blue 2nd June Mark Dodd and Jo Pile Swinley Forest, Berks -18 days
32 Small Skipper 2nd June Sarah Ronan Medmenham, Bucks -13 days
31 Dark Green Fritillary 31st May Mark Smith Grangelands, Bucks -14 days
30 Ringlet 30th May Karen Saxl Upton, Oxon -14 days
29 Marbled White 28th May Karen Saxl Upton, Oxon -9 days
28 Black Hairstreak 26th May Justin Davey Horton-cum-Studley, Oxon -11 days
27 Meadow Brown 23rd May David Bristol Yoesden Bank, Bucks -8 days
26 Large Skipper 18th May David Hastings Aston,Oxon -8 days
25 Wall Brown 3rd May David Hastings Crog Hill, Oxon -34 days
24 Wood White 3rd May Nick Board Wicken Wood, Bucks -9 days
23 Marsh Fritillary 1st May Rob Ker Yoesden Bank, Bucks -20 days
22 Adonis Blue 30th April Peter Cuss Lardon Chase, Berks -19 days
21 Small Blue 29th April Hugh Smith Hackpen Hill, Oxon -9 days
20 Common Blue 25th April Roy Booth Warburg Reserve, Oxon -11 days
19 Brown Argus 20th April Tom Dunbar Incombe Hole, Bucks -15 days
18 Duke of Burgundy 11th April Roy McDonald Incombe Hole, Bucks -14 days
17 Small Heath 11th April James Ford Buttlers Hangings, Bucks -18 days
16 Dingy Skipper 9th April Francis Gomme Grangelands, Bucks -15 days
15 Small Copper 4th April Barry Stickland Finchampstead, Berks -18 days
14 Grizzled Skipper 1st April Mark Smith Incombe Hole, Bucks -17 days
13 Green Hairstreak 31st March Mark Batchelor Aston Rowant NNR, Oxon -14 days
12 Green-veined White 30th March Andy Spragg Little Milton, Oxon -4 days
11 Holly Blue 30th March Peter Holland Wallingford, Oxon +2 days
10 Speckled Wood 30th March David Hastings Aston, Oxon +1 day
9 Orange-tip 26th March Brenda Mobbs Holmer Green, Bucks -3 days
8 Large White 19th March Andy Hainge Reading, Berks -14 days
7 Small Tortoiseshell 2nd March Geoff Dymott Letcombe Regis, Oxon +23 days
6 Painted Lady 28th February Maggie Simons Flackwell Heath,Bucks -54 days
5 Red Admiral 2nd February Mark Dodd and Jo Pile Crowthorne, Berks +11 days
4 Brimstone 30th January Fiona Tchen Hampden Bottom, Bucks +5 days
3 Small White 15th January Fiona Tchen Coombe, Bucks -59 days
2 Comma 5th January Chris Carter Alvescot, Oxon -41 days
1 Peacock 2nd January Emily Stott Oxford, Oxon -23 days