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    Boulder Grand Pass Trail

    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    Very Hard
    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.
    This reflects the return distance of this route as measured by the GPS file.
    24.5 km
    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.
    1,143 m
    User Ratings
    These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
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    Directions to Trailhead

    Adventure past several cascading waterfalls, through aspen groves and alpine tundras up to Thunder Lake and the Boulder Grand Pass. The Boulder Grand Pass Trail is a lengthy but undeniably rewarding hike in the Rocky Mountain National Park that reveals stunning alpine vistas.

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    Route Description for Boulder Grand Pass Trail

    Make sure you have one some comfortable hiking shoes before beginning your journey along the Boulder Grand Pass Trail. This adventure is lengthy, vertiginous, and not for the faint of heart. Exhibiting the diversity of the Colorado wilderness, the Boulder Grand Pass Trail also exhibits diverse weather, so wear layers as insurance against chilly conditions. Microspikes are also a great idea as the terrain will likely be snowy as you ascend in elevation. Remember, because the trail is located within the Rocky Mountain National Park, visitors are required to purchase a pass.

    Departing from the Wild Basin Trailhead, the Boulder Grand Pass Hike tracks southwest past three cascading falls. You will confront the first intersection at the Pine Ridge Campsites. Here, veer right and you will be diverted onto the Thunder Lake Trail. Hike along the North Saint Vrain Creek as the terrain gradually ascends. Eventually, you will encounter another junction. At this point, keep left and climb up to Thunder Lake. Along the shores of Thunder Lake is a great place to rest before the final push to the pass.

    Dip your tired toes in the chilly alpine waters before ascending the Boulder Grand Pass Trail up to the Lake of Many Winds. From here, the path is unmaintained. Scramble up the extremely steep terrain to the summit of the Boulder Grand Pass. Then, revel in the awe-inspiring views of the mountainous landscape that surrounds you. If you have any gas left in the tank, ascend Tanima Peak. Explore the summit and admire the beauty before retracing your steps along the path all the way back to the trailhead.

    Getting to the Boulder Grand Pass Trail Trailhead

    The Boulder Grand Pass Trail departs from the Wild Basin Trailhead off County Highway 115.

    Route Information

    • Backcountry Campground

      Designated Dispersed Campsites, view details here.

    • When to do


    • Pets allowed


    • Family friendly


    • Route Signage


    • Crowd Levels


    • Route Type

      Out and back

    Boulder Grand Pass Trail Elevation Graph

    Weather Forecast

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    Boulder Grand Pass Trail Reviews

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