Colorado records
Sinaloan Nightsnake in Colorado
HarmlessHypsiglena torquata

Yes. The Sinaloan Nightsnake has been recorded in 2 Colorado counties. It is non-venomous (harmless). Pale gray with dark blotches, vertical pupils, and dark neck blotches.
Colorado counties with Sinaloan Nightsnake records
2 listedSee the full Sinaloan Nightsnake profile or all snakes in Colorado.