All,
Apologies for the late report,but yesterday (3-30-19) Debbie Barnes, Annette Megneys, and myself had a single, female Chestnut-collared Longspur at Guanella Pass in Clear Creek County, feeding on grasses in a bare knoll, right alongside a flock of White-tailed Ptarmigan. Photos are in the below eBird checklist:
Best,
Tyler J. Stewart
Colorado Springs