Observation notes: On the ascent of Mt Bierstadt, not at the peak
Verified by: mikefisher
Verified date: December 12, 2018
Coordinator notes: The checkerspot you photographed is the high altitude subspecies of the Variable Checkerspot (Euphydryas anicia brucei). Edith's Checkerspot is found a lower altitude and mostly in western Colorado, being found in eastern Colorado only in northern Larimer County.
Sorry it took me so long to get to your sighting and confirm. Mike