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    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
    561 m
    This reflects the return distance of this route as measured by the GPS file.
    18.1 km
    This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
    User Ratings
    These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
    Intermediate (Square)
    Suitable for intermediates who are ready for a little bit more adventure.
    Physical DIFF
    Easy (Circle)
    Suitable for beginners, families, young children, and those looking for a casual adventure.
    Technical DIFF
    Directions to Trailhead

    Sourdough Trail

    Panorama on Sourdough snowshoe trail in Indian Peaks, Colorado

    Download an interactive map and guide on your phone today!

    Table of contents

    Sourdough Trail is a popular cross-country skiing and snowshoeing trail, conveniently off of the Peak to Peak Hwy. It is a beautiful out and back climb through Roosevelt National Forest!

    Route Description for Sourdough Trail

    The Sourdough Trail is a straightforward out-and-back trail that travels through the beautiful Roosevelt National Forest. From the trailhead, the trail steadily climbs and gains elevation from its starting point of 2,804 m as it traverses across the mountain slopes. This is a perfect cross-country ski trail and is popular for snowshoeing and fat biking.

    Approximately a third of the way up the trail, you will cross over a small bridge over Fourmile Creek. The end of the trail puts you at the closed gates to Brainard Lake Recreation Area within the Indian Peak Wilderness. The way back is to follow your tracks back down to the trailhead.

    Insider Hints for Sourdough Trail

    Getting to the Sourdough Trail Trailhead

    From Boulder take CO-119/Boulder Canyon Drive to the town of Nederland. At the traffic circle, take the 2nd exit onto W 2nd St. Continue onto CO-72 Peak-to-Peak Highway towards Estes Park for 10.9 km. There will be a Camping & Hiking sign indicating a left turn towards Rainbow Lakes onto Co Rd. 116. Trailhead parking is on the left side of the road approximately 0.8 km down the dirt road.

    Route Information

    • When to do:

      Late November to Early April

    • Backcountry Campsites:

      Camping is allowed in the backcountry, no permit required.

    • Toilets:

      Yes, primitive pit toilet

    • Pets allowed:

      Yes - On Leash

    • Family friendly:


    • Route Signage:


    • Crowd Levels:


    • Route Type:

      Out and back

    Sourdough Trail Elevation Graph

    Weather Forecast

    Check Area Weather


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