Near Frisco in the Arapaho National Forest, the Boreas Pass Road (FS10) is an easy 6.5 mile one-way route to the summit of Boreas Pass. The route climbs from 10,300 feet to 11,500 feet along an old railroad grade.
To reach the dirt biking trailhead from US70, use Exit 203 and head south on SR9 through Frisco towards Breckenridge. Turn left on Boreas Pass Road (CR10) for 3.5 miles.
The road follows the old South Park & Pacific Railroad grade. There are views of the Upper Blue River Valley and the majestic Tenmile Ridge.
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Non-residents are not required to register in Colorado, if they are registered in their home states. All off-highway vehicles must have an approved muffler and spark arrester. These requirements are subject to change so make sure to contact the Colorado State Parks prior to using your off-highway vehicle.
Overall, Boreas Pass Road is the 47th most popular dirt bike trail of all 93 dirt biking rides in Colorado.