Fourmile Link Trail

Trail Meter: 

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 with BCPOS to make the system work better!


Fourmile Link Trail KMZ7.85 KB
Fourmile Link Trail GPX70.14 KB
Fourmile Link Trail Click on image to enlarge

T: 6 A: 6 C: 7

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0.8 mi.
350 ft.


@RangerFowler via Twitter: Inch of new snow at Betasso overnight. 20 degrees. Trails are snow packed and icy. Slick roads too!

Trail Meter: Good»Poor

Wed 11/11, @RangerFowler via Twitter: 6 inches of heavy wet snow at #Betasso overnight. Some melting today. Roads plowed.

condition set to Good

condition set to Good

Tacky, smooth, perfect. Love this trail after a good rain.

Excellent shape.

Bridge across Four Mile Creek has been reinstalled and looks to be bombproof now. Go get some!

Water levels down, easy crossing.

Riding great despite all the rain.

FYI- the creek crossing on the Fourmile link trail is perfectly fine. No getting wet down there until next spring!

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