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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 39 exciting races in the area. Check out our detailed list below to find your next local race.

September 2025
Sep
28
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km 13 mi 26 mi
October 2025
Oct
4-5
Sa - Su

The Bear Chase

Trail Run 5 km 10 km ... 50 mi 100 km
Oct
4
Saturday

Rocky's Backyard Ultra

Backyard Ultra 4 mi
Oct
4
Saturday

Not So Flatt Breast Cancer Awareness Run

5 km 10 km
Oct
5
Sunday

RMRR Trophy Series

5 km 8 mi
Oct
12
Sunday

Westy Half

5 km 13 mi
Oct
12
Sunday

The bRUNch Run

5 km 10 km
Oct
18
Saturday

The Great Trailhead Foot Race 10 Miler

Trail Run 5 mi 10 mi
Oct
25
Saturday

Beware The Bear Trail Races

Trail Run 5 km 15 km
Oct
26
Sunday

Ghosts and Goblins 10K

5 km 10 km
November 2025
Nov
1
Saturday

City Park 5k for Pancreatic Cancer Research

5 km
Nov
2
Sunday

All-Out Kooky-Spooky

5 km 10 km 13 mi
Nov
2
Sunday

Turkey Trails Denver

5 km 10 km
Nov
2
Sunday

RMRR Trophy Series

5 km 15 km
Nov
2
Sunday

Feet for Justice Run

5 km 10 km
Nov
8
Saturday

Bell Ringer 4 Miler

4 mi
Nov
15
Saturday

Louisville Trail Race

Trail Run 5 km 10 km 13 mi
Nov
22
Saturday

Turkey Trek 10k

5 km 10 km
Nov
27
Thursday

Broomfield Turkey Day 10K

5 km 10 km
December 2025
Dec
6
Saturday

Toy Drop

5 km 10 km 15 km
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