Colorado at its Best – the Carbon Valley Half Marathon showcases the beauty & diversity of Colorado’s best kept secret. Small town charm with Big City services, nestled between Denver & Fort Collins, Firestone & Frederick host these 13.1 mile & 5K adventures. Runners tread upon Mining Town history via manicured trail systems, dirt paths &rural roads, bridges & tunnels. The Firestone Trail, Frederick’s gorgeous Milevac Lake & Charming Downtown are some highlights. The entire course has spectacular views of the Rockies and a 2 Mile Downhill FAST FINISH. Also offered is a Relay, & FUN RUN!

Participants are asked to donate and/or raise funds for Autism Research individually or as a team.

05-09-2026, 07:00 am - 01:00 pm