The best running trails around Boulder

331runs

4.4

(28)

7,307 people ran here

Running around Boulder is one of the best ways to explore more of this region. To help you discover the most beautiful places to run, we’ve reviewed our full collection of routes around Boulder—and are proud to present the best running trails. Click on any of the routes for more details and browse real tips and photos uploaded by other runners.

Mount Sanitas via Lion's Lair loop — Boulder Open Space and Mountain Parks	Expert 01:45 10.9km
Boulder Reservoir loop	Intermediate 00:57 8.50km
Mount Sanitas loop via Red Rocks — Boulder Open Space and Mountain Parks	Expert 01:39 10.7km
Mount Sanitas via Goat Path Trail loop — Boulder Open Space and Mountain Parks	Expert 01:06 6.33km

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Map data © OpenStreetMap contributors
1
1
Mount Sanitas via Lion's Lair loop — Boulder Open Space and Mountain Parks
01:45
10.9km
9:35/km
480m
480m
Expert
240
Expert run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
Map data © OpenStreetMap contributors
2
2
Boulder Reservoir loop
00:57
8.50km
6:45/km
30m
30m
Intermediate
154
Intermediate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Map data © OpenStreetMap contributors
3
3
Mount Sanitas loop via Red Rocks — Boulder Open Space and Mountain Parks
01:39
10.7km
9:13/km
430m
430m
Expert
140
Expert run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
Map data © OpenStreetMap contributors
4
4
Mount Sanitas via Goat Path Trail loop — Boulder Open Space and Mountain Parks
01:06
6.33km
10:25/km
420m
420m
Expert
115
Expert run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.