Link to report: State of the Butterflies in the US
A study published in March 2025 showed that we are losing butterflies at a rate of 1.3% per year in the contiguous US: more than one-fifth of our butterflies disappeared between 2000 and 2020. Perhaps more alarming, over 40% of assessed species fell in numbers by 50% or more—and two dozen species suffered more than 90% losses.

State of the Butterflies in the United States presents a summary of those findings, species-level information on population trends for each of seven regions, and most importantly, a roadmap for how we can recover butterflies in the places we live, work, and play.