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Trail Running Calendar near Boulder Reservoir 2025-2026

Explore the top trail runs near Boulder Reservoir for 2025-2026! We've gathered 91 exciting races in the area. Check out our detailed list below to find your next local race.

March 2026
Mar
22
Sunday

Central Park 5k

5 km
Mar
22
Sunday

All-Out Spring Fever

5 km 10 km 13 mi
April 2026
Apr
10-11
Fr - Sa

Run The Ranch

Trail Run 5 km 10 km ... 6 hr 12 hr
Apr
12
Sunday

Donut Dash - Denver

5 km
Apr
18
Saturday

All-Out Beat the Heat

5 km 10 km 13 mi
Apr
25
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
Apr
26
Sunday

Unicorn 5k

2 mi 5 km
May 2026
May
10
Sunday

Colorado Women's Classic

5 km 10 km 10 mi
May
16-17
Sa - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
June 2026
Jun
6
Saturday

J-Town Jog 5K

5 km
Jun
7
Sunday

Flamingo Day 5K

5 km
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