Fourmile Link Trail
Get ready for a lung-buster!
This 0.8 mile trail allows you to access the Betasso Preserve trail system from Fourmile Canyon. To use this trail, you should ride from town - there is no parking and no trailhead at Fourmile Canyon Road.
This trail also enables more adventurous (stubborn? jonesing for miles?) mountain bikers to make a loop from Boulder without repeating trail - check out the Super Betasso route description for more info.
The Fourmile Link Trail is possible due to one of the most exciting recent open space purchases by Boulder County Parks and Open Space (BCPOS). After acquiring 400 acres to the north and west of Betasso Preserve, BCPOS decided to build an additional 4 or so miles of trail that connect to the Canyon Loop Trail, and the Benjamin Loop (2011) and Fourmile Link were born. Whenever you see some County staff on the trails, thank them for building this awesome shared use trail!
Important stuff you should know:
- This trail is closed to bikes on Wednesdays and Saturdays
- Expect two-direction traffic, so look ahead and watch for other trail users.
- There is no formal trailhead on Fourmile Canyon Drive, and no parking along that stretch of road, so BMA recommends riding your bike from town if you want to access Betasso Preserve from this trail.
Please obey these rules and BMA will continue to work within the political process to make the system work better!
| Attachment | Size |
|---|---|
| Fourmile Link Trail KMZ | 7.85 KB |
| Fourmile Link Trail GPX | 70.14 KB |
T: 6 A: 6 C: 7
Learn more about BMA Rating

Comments
From BocoWildWork via Twitter: BMA Posse delivers again. Thanks for your help finishing up our spring work on the Betasso Link. #boco_trails http://t.co/iwpzsXiDLY
5/21 Dry.
From BocoWildWork via Twitter: Nice job by the Boulder Running Company Cycling Team at Betasso. We appreciate the rock work! #boco_trails http://t.co/TRJpr9dzqC
From BocoWildWork via Twitter: Nice job by the Boulder Running Company Cycling Team at Betasso! Appreicate the rock work. #boco_trails http://t.co/rz13ENMGJD
From RangerVroman via Twitter: Beautiful day for a ride or hike at Betasso! #boco_trails http://t.co/8utJnh4evq
From BocoWildWork via Twitter: Great work by @LeisureTrendsGr with a doubleheader today. Half the group rocked out at Betasso...#boco_trails http://t.co/SgXSO4PAEI
From RangerOLeary via Twitter: Perfect day for hiking, riding or just enjoying the view @ Betasso. #boco_trails http://t.co/ZUoAthkdwn
From RangerFowler via Twitter: Benjamin Loop @ Betasso is now clockwise in direction for cyclists. Fourmile creek running high. #boco_trails http://t.co/bKDDHJ47nT
From JoelDWhite via Twitter: The newish 4mile connector to Benj/ Betasso is great, but its hard to spot. I missed it twice, map where it is before going #boco_Trails
Perfectly dry and in great shape