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The best MTB trails in Boulder County
4.4
(74)
3,958
riders
220
rides
Last updated: September 19, 2025
4.8
(4)
209
riders
1. Marshall Mesa loop via Dowdy Draw Trail — Boulder
29.0km
02:35
330m
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.
2.7
(3)
202
riders
2. Canyon Loop & Benjamin Loop – Betasso Preserve
14.6km
01:36
420m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
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4.8
(4)
187
riders
3. Marshall Mesa loop — Boulder
24.9km
02:11
260m
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.4
(5)
182
riders
4. Hall Ranch Loop — North Foothills Open Space
18.6km
01:47
440m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
4.3
(4)
170
riders
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.0
(2)
103
riders
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
68
riders
7. West Magnolia loop — Nederland
15.6km
01:37
370m
Expert mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
6
riders
8. Heil/Hall Ranch loop — Lyons
52.0km
05:07
1,190m
Expert mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
5.0
(2)
11
riders
9. North Boulder loop — Boulder
14.5km
01:11
110m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
5.0
(1)
11
riders
10. South St. Vrain loops — Ward, Colorado
29.0km
03:01
700m
Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels.
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