The Big Butterfly Count helps conservationists identify those species in the most trouble, and is critical for monitoring populations across the UK.
Find out how to take part in the 2025 Big Butterfly Count, and what to look for. All you need is 15 minutes, a notepad and a shady spot.
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What is the Big Butterfly count?
The Big Butterfly Count is one of the largest citizen science projects in the UK. It lasts for just over two weeks, usually during the summer, and involves picking a spot in your garden, local green space or the countryside and spending 15 minutes counting the butterflies and moths you can see.
Why does it matter?
The data you help gather is crucial to butterfly specialists wanting to learn more about the population and habits of various butterflies. It will enable butterfly scientists to assess where conservation efforts are most important.
Last year's results were particularly alarming: on average, participants spotted just seven butterflies on average per 15 minute count in 2024 – the lowest in the history of the Big Butterfly Count.
Dr Richard Fox, head of science at Butterfly Conservation said: “We need everyone, everywhere to get out for the Count this year and help us find out if last year’s shocking results were a blip, or if they indicate a much greater issue.”
“Butterflies are a key indicator species; when they are in trouble, we know that the wider environment is in trouble too.”
To take part, simply visit Big Butterfly Count's website or download the free Big Butterfly Count app.
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Main image: the common blue butterfly had one of the worst Counts in 2024. Credit: Andrew Cooper via Big Butterfly Count.
