Lost Lake Trail
Lost Lake Trail

Lost Lake Trail

Mount Baker-Snoqualmie National Forest
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Lost Lake Trail

Lost Lake Trail

Distance: 10.4mi
Elevation: 2,073ft
Time: 4.5-6.5h

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Lost Lake Trail is a moderately trafficked out-and-back trail in Mount Baker-Snoqualmie National Forest that is rated as moderate. This hike might be longer, but the elevation gain is gradual, making it suitable for intermediate hikers or adventurous children. This trail is popular with equestrians, so remember to give horses the right of way. Bug spray is also essential for this hike.

Lost Lake Trail Map

Getting there

The trailhead for the Lost Lake Trail is at the end of National Forest Development Road 7033 off NF 70.

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Backcountry Campground

Lost Creek Backpacking Site, Lost Lake Backpacking Site

When to do


Pets allowed

Yes - On Leash

Family friendly

Older Children only

Route Signage


Crowd Levels


Route Type

Out and back

Lost Lake Trail
Elevation Graph

Lost Lake Trail Description

Lost Lake is a wonderful destination, and this trail sees more and more traffic every year as hikers discover its charm. The forest before the lake is recovering from a fire in past years, but a carpet of wildflowers covers this regrowing area in the middle of summer. Watch for horses (and mosquitoes) on this trail.

The hike begins at the end of the road. Head straight onto Greenwater Lakes Trail. There are some crossings over Meadow Creek, and some of the bridges are better than others. Take your time and be careful if they seem less sturdy.

You’ll hug the creek until Greenwater Lakes, a nice place to catch your breath. Continue past the lake and the irregularly-shaped unnamed body of water just past it, curving south to cross the stream again. You’ll pass Lost Creek Backpacking, where backpackers may be setting up their tents.

Follow Lost Creek, staying right onto Lost Lake Trail when the trail forks. If you cross the stream shortly after the fork you’ve gone the wrong way. The trail eventually passes little Quinn Lake, then makes the final approach to Lost Lake, passing another backpacking site.

The trail continues past the lake to Noble Knob, but you’ll want to turn around here and retrace your steps if Lost Lake is your final destination.



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