If you're looking for half marathons with stunning scenery and cool mountain air, Colorado delivers. With summer and early fall race dates, you can enjoy wildflower-lined trails, historic rail routes, and crisp autumn mornings. Here are four upcoming half marathons worth adding to your calendar.
Colorado Springs Marathon, Half, 5K, and Kids K
Saturday, October 3, 2026 — Colorado Springs
This race offers a half marathon alongside a full marathon and shorter distances, making it a great option if you're traveling with family or friends. The course takes you through Colorado Springs with views of Pikes Peak. Fall weather often means comfortable running temperatures and colorful foliage. With a quality score of 78, it's a runner favorite.
Byers Peak Stampede Half Marathon & 5K Run
Saturday, August 22, 2026 — Fraser
Located near Winter Park, this race combines small-town charm with mountain scenery. The half marathon course winds through Fraser Valley with Byers Peak as a backdrop. August wildflowers and pine forests make this a memorable run. It scores 72 and is known for a supportive community atmosphere.
TBK Bank Thirsty 13 Half Marathon
Saturday, August 29, 2026 — Durango
A point-to-point course along the Animas River Trail and through downtown Durango. The name hints at a well-earned post-race drink. The San Juan Mountains provide a stunning setting, and late summer temperatures are usually mild. This race has a quality score of 72 and a reputation for excellent organization.
Georgetown to Idaho Springs Half Marathon
Saturday, August 8, 2026 — Unknown, Colorado
This historic point-to-point race follows the former railroad grade between Georgetown and Idaho Springs. It's a net downhill course, which can lead to fast times. The route offers views of Clear Creek Canyon and old mining relics. With a 71 quality score, it's a solid pick for scenic runners.
Ready to plan your next Colorado half? Check out all 20 upcoming half marathons in Colorado on HalfRuns and find the one that fits your adventure.