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    Thompson Lake Trail

    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    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.
    17.7 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.
    1,199 m
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    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

    Thompson Lake Trail is a 17.7 km moderately trafficked out-and-back trail in Middle Fork Snoqualmie Natural Resources Conservation Area that is rated as hard. This trail is demanding in distance and elevation, but it’s a journey that culminates at a wonderful alpine lake tucked into the mountains, with islands of trees seemingly floating in the water. If you’re seeking a bit of a longer trail but want to avoid heavy crowds, this trail could be the perfect pick.

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    Route Description for Thompson Lake Trail

    Thompson Lake is a serene, pretty lake amidst the mountains accessible on a longer, more demanding trail. If you’re searching for a decent workout without heavy crowds, this trail is a good pick. Keep in mind that you’ll drop a considerable amount of elevation to access the lake, so keep some gas in the tank to get back up onto the trail on your return trip.

    The hike begins on the Granite Creek Trail. Much of the hike is on a somewhat narrow, rocky trail that can be a bit overgrown in spots. Where the logging road approaches the trail early on, stay left to stay on your route.

    The hike continues, gaining elevation and curving towards Granite Creek. You’ll come to a T-junction where you should stay left. The Granite Creek Connector goes off to the right, and you’ll take the Granite Lakes Trail on the left.

    The trail hugs, and then crosses the creek. Where the path forks, stay left again onto Thompson Point Trail. At about 1,210 m of elevation, take Thompson Lake Trail straight ahead as the Thompson Point Trail splits off to the left.

    Climb, climb, climb, then drop off down towards the lake. The approach trail can be slick when wet, so be careful. You’ll have access to the lakeshore, and the trail continues halfway around the lake on the left if you want a different vantage point.

    When you’re ready, retrace your steps, taking on a steep initial ascent before a more manageable descent back to the parking lot.

    Getting to the Thompson Lake Trail Trailhead

    The trailhead for Thompson Lake Trail is off FS 56/Middle Fork Road. There is a small road to a parking area at the Granite Creek Trailhead.

    Route Information

    • Backcountry Campground


    • When to do


    • Pets allowed

      Yes - On Leash

    • Family friendly


    • Route Signage


    • Crowd Levels


    • Route Type

      Out and back

    Thompson Lake Trail Elevation Graph

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    Thompson Lake Trail Reviews

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