Boulder
Trail Running Calendar near Boulder 2026-2027
Explore the top trail runs near Boulder for 2026-2027! We've gathered 22 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
November 2026
Trail races in Louisville Colorado offering a half marathon, 10K and 5K on dirt trails with views of the Flat Irons and on course aid stations.
December 2026
Limited to 40 runners on the Thumb Open Space trail in Estes Park, participants repeat 2 km laps with 540 ft gain and collect poker chips to record ascents.