Anyone can take part.
Dr Katie Cruickshanks, project coordinator said: "Seventy per cent of the UK's land is in agricultural use so it's essential that butterflies in these areas are monitored. This project will give us the first truly representative picture of the health of butterflies in widespread habitats such as lowland intensive farmland and upland moorland."
The survey requires just two visits in July-August to a randomly selected 1km square and there is still time to take part. For more information visit the UK Butterfly Monitoring Scheme.