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blue Betasso Preserve

  4.1 ( 56 ) Favorite


6.7 mile 10.7 kilometer loop
94% Runnable


Ascent: 776' 237 m
Descent: -778' -237 m
High: 6,575' 2,004 m
Low: 6,178' 1,883 m


Avg Grade: 4% (3°)
Max Grade: 16% (9°)


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Trail shared by Duncan Moore

This run is easily accessible from Boulder and offers amazing singletrack with beautiful views.

Duncan Moore

Features Birding · Fall Colors · Views · Wildflowers · Wildlife


To access, drive up Boulder Canyon turning right up Sugarloaf Road. Take your first right up Betasso Road. Once on Betasso Road you'll see parking for the trailhead on your left.

Need to Know

Recommended use Wednesdays and Saturdays due to mountain bike closure. If you choose to run on a day that bikes are allowed, it is recommended to pay attention to the direction of bike traffic, which is posted and run against bike traffic. This makes visibility for both parties better. Always be courteous to everyone using the trail.

Runner Notes

This route features smooth, hard-packed dirt with occasional rocks and roots.


The trailhead offers a bathroom, picnic area, and plenty of parking. Unfortunately there is no access to drinking water.

The Canyon Loop opens up to a fork in the road. The trail is one giant loop and either direction is appropriate for travel.

Canyon Loop Trail totals 3.3 miles and begins on the rim of the preserve. The first half of the trail quickly drops in altitude and the second half of the trail is spent gaining altitude. The trail is mainly comprised of singletrack and has numerous opportunities for amazing views. The trail is made up of compact dirt with some rocks and roots showing.

Near the half waypoint of the Canyon Loop, the Benjamin Trail Link intersects. This is 0.75 miles of singletrack that brings you directly to the Benjamin Loop. The Benjamin Loop is by far the best part of this run offering 2.4 miles of heavily forested singletrack. The trail has similar signage as the Canyon Loop dictating direction of travel for bicycles. The trail is comprised of a series of switchbacks that gradually climb up the rim and then descend into another series of switchbacks. The trail is hard compact dirt with a bridge feature.


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May 13, 2019
Chad Carter
6.7mi — 1h 10m
Apr 28, 2019
Georgina B
amazing run with a great variety of scenery! Lots of singletrack switchbacks (especially during the Benj Loop section). Sunday open to mountain bikes — 11h 30m
Apr 13, 2019
Feb 24, 2019
Joe Allen
some snow drifts and some tiny patches of ice. this is a great beginner trail. trail intersection are well marked. 7.1mi — 1h 16m
Feb 13, 2019
Charly Jackson
Dec 11, 2018
Ryan Hull
A little bit of ice and snow were not going to scare me off of this. 11mi — 2h 00m
Oct 24, 2018
Sam Albert
Oct 17, 2018
Chris Mavricos
6.7mi — 1h 02m

Trail Ratings

  4.1 from 56 votes


  4.1 from 56 votes
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