The Big Butterfly Count is a nationwide citizen science survey aimed at helping us assess the health of our environment. It was launched in 2010 and has rapidly become the world’s biggest survey of butterflies.

The Big Butterfly Count 2026 reopens on the 1st of July ready for the main event between the 17th of July and 9th of August. All the counts can be viewed on the interactive map.

We count butterflies because not only are they beautiful creatures to be around but they are also extremely important. They are vital parts of the ecosystem as both pollinators and components of the food chain. However, they are under threat. Numbers of butterflies and moths in the UK have decreased significantly since the 1970s. This is a warning that cannot be ignored.