Under permit from the Colorado State Park system, this program seeks to document butterfly populations in the diverse habitats of Colorado’s Roxborough State Park in Douglas County. Using a modified Pollard approach, a consistent 7.5 km path is walked on > 20 occasions during the butterfly season from towards the end of March through the beginning of October. Initially conducted mostly in the 1980s as presence/absence surveys, they were re-started in 2018 utilizing counts of species.

PollardBase is an online system for managing butterfly monitoring programs.