South Lost Lake Trail

Larrabee State Park

Northern Puget Sound, Washington

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South Lost Lake Trail


  • The first 2.1 miles follow Fragrance Lake Road (open for biking as well).- South Lost Lake Trail
  • An unnamed waterfall just off the road.- South Lost Lake Trail
  • The official Lost Lake Trail.- South Lost Lake Trail
  • Red alder (Alnus rubra) is abundant along the trail.- South Lost Lake Trail
  • A trailside boulder along the traverse.- South Lost Lake Trail
  • Bigleaf maple (Acer macrophyllum) and sword ferns (Polystichum munitum) cover the slopes below the trail.- South Lost Lake Trail
  • Lost Lake Trail signage.- South Lost Lake Trail
  • Looking up to a canopy of red alder (Alnus rubra).- South Lost Lake Trail
  • Cascades frog (Rana cascadae).- South Lost Lake Trail
  • Low-lit coniferous forest.- South Lost Lake Trail
  • A cliff below Chukanut Ridge.- South Lost Lake Trail
  • A western red cedar (Thuja plicata) rooted atop a boulder.- South Lost Lake Trail
  • The north shore of Lost Lake.- South Lost Lake Trail
  • A view south down the length of Lost Lake.- South Lost Lake Trail
  • - South Lost Lake Trail
Overview + Weather
Lakes. Waterfalls. Accessible year-round.
Stinging nettles during spring and summer.
Northern Puget Sound, WA
Pets allowed: 
Net Elevation Gain: 
1,000.00 ft (304.80 m)
Parking Pass: 
Washington Discovery Pass
Preferable Season(s):
Winter, Spring, Summer, Fall
Suitable for:
Hiking, Biking
Total Distance: 
9.40 mi (15.13 km)
Trail type: 
Trailhead Elevation: 
200.00 ft (60.96 m)
Current Local Weather:
Hike Description

Hike Description


The South Lost Lake Trail makes up the far southern portion of the Larrabee State Park trail system, located just south of the city of Bellingham. The lake itself rests on the east side of Chuckanut Ridge, and it is often hiked in combination with nearby Fragrance Lake.

The beginning of the route ambles northeast from the Clayton Beach Trailhead along Fragrance Lake Road. The grade steepens before long, following some wide switchbacks through mixed forests and fern-filled gullies. At 1.3 miles, a roadside waterfall pours down to a culvert underfoot. Less than a mile further lies the signed junction for the official Lost Lake Trail as well as “back-door” access to Fragrance Lake.  

The narrower Lost Lake footpath jets off on a long southeast traverse beneath Chuckanut Ridge. Notice the lighting change as deciduous forests of red alder and bigleaf maple begin to replace the heftier cedar and fir. Stick close to the trail along this stretch, for hordes of stinging nettle line the edges during the spring and summer months. At 4 miles from the parking lot, another junction comes along for the utterly impressive Rock Trail. Here, the south end of Lost Lake lies obscured only a few hundred feet below. Continue a mild descent above the east shore to a junction for the North Lost Lake Trail. Head right to travel around the west lakeshore, where you’ll find the highlights of the trip: a gushing waterfall and giant rock with sweeping views of the lake.

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Field Guide + Trail Map

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Nearby Camping + Lodging

(6 within a 30 mile radius)

Nearby Adventures

(78 within a 30 mile radius)

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