Boulder
Trail Running Calendar near Boulder 2026-2027
Explore the top trail runs near Boulder for 2026-2027! We've gathered 25 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
May 2027
Trail races at YMCA of the Rockies on May 22, 2027 offering 10K, 25K, and 50K on mostly runnable singletrack at 8,000 feet; the 50K includes 6,000 feet of gain.
June 2027
Experience a scenic downhill race through the Rocky Mountains with distances ranging from a 5 mile run to a full marathon passing the historic Stanley Hotel.
August 2027
Mountain trail races in Winter Park, CO with 50K, 21K and 10K courses on singletrack and dirt roads, finishing in town at Hideaway Park.
Trail races at Standley Lake in Westminster CO offering distances from 6K to 50K on 100% dirt courses with aid stations and parking at Wayne Carle Middle School.
Trail-focused half marathon and 5K in Fraser, Colorado, on unpaved roads and trails, with chip timing and proceeds benefiting the Shining Stars Foundation.
September 2027
A multi-day ultrarunning event in Loveland, Colorado, featuring looped timed and distance races, 24/7 aid, camping, and mileage buckles.