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Stimpson Family Nature Reserve Loop



3.1 mile 4.9 kilometer loop
93% Runnable


Ascent: 369' 113 m
Descent: -370' -113 m
High: 796' 243 m
Low: 522' 159 m


Avg Grade: 5% (3°)
Max Grade: 15% (8°)


No Dogs
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Trail shared by Eric Ashley

A strikingly beautiful loop that invites visitors to connect with nature.

Eric Ashley

Features Lake · River/Creek · Views · Wildlife

Stimpson Family Nature Reserve is open from sunrise to sunset.


In just a few miles, runners will encounter old-growth trees, seas of ferns, wetlands, shaggy clumps of moss, and various creatures that inhabit this peaceful reserve.

Need to Know

A number of the bridge crossings can be quite slippery when wet. Be careful!

Runner Notes

The climbs can be pretty steady, but the inviting tread and beautiful surroundings make this a choice place to run.


From the kiosk at the parking area, follow the wide gravel path as it heads into the forest. Very soon, you'll reach a slightly obscured wetland complete with a viewpoint and bench. A few roots enter the tread, but the going remains very easy as runners climb a gentle slope lined by tall cedars.

Keep left at the sign for Main Loop Trail before switchbacking down to a low bridge over a marshy area. The trail doubles back and rounds a large, mossy boulder before reaching the intersection with the Geneva Pond Loop Trail. The pond can be added on as a nice detour that will lengthen this run by 1.2 miles.

The Main Loop Trail continues to wind through a patch of ferns before eventually beginning a well-benched climb that explores small valleys and seasonal streams along the edge of the hillside.

The climbing continues to steepen, but the path is well constructed and obstacles are few, allowing for lots of opportunity to appreciate the area's tall trees and myriad of lush ferns. Higher up, the trail climbs steadily above the forest floor, where small shallow ponds fill with rain. If you're traveling quickly, you'll begin to feel the sustained climbs before the trail levels off on a wide hogback ridge.

A gentle bend in the trail brings runners to a less-prominent hogback that soon transitions into a climb up the next ridge. Keep an eye out for a small grass-filled pool that murmurs with small, serenading frogs.

Ahead, the sign for the Sudden Valley Connector is planted just before where the trail enters a long, sustained descent along the edge of the hill. While the grade varies, the descent continues for quite a while, becoming rocky lower down. Where it levels off near a marshy area, both the trail and corridor become wider. An easy climb brings runners back to the Parking Area - Main Loop Connector. Veer left on the connector to reach the parking area and the end of the run.

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Flora & Fauna, History & Background

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Land Manager: Whatcom Land Trust

Mar 20, 2020: COVID-19

Mar 9, 2020: Power of the People

Feb 7, 2020: Leadership Changes

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Jul 6, 2019
Cole DeForest

Trail Ratings

  4.0 from 4 votes


  4.0 from 4 votes
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in Washington


37 Views Last Month
1,191 Since Nov 14, 2016



Ashley jogs between the ferns on a mild winter evening.
Feb 25, 2018 near Geneva, WA
Various low pools along the trail deepen with the rains.
Nov 14, 2016 near Sudden…, WA
Lush forest surrounds the trails at the Stimpson Family Nature Reserve.
Nov 14, 2016 near Geneva, WA
A moss covered pinnacle standing at the edge of the pond.
Feb 25, 2018 near Geneva, WA
Heading through the trees on the Geneva Pond Loop Trail.
Feb 25, 2018 near Sudden…, WA
Moss-covered trees along the Stimpson Main Loop Trail.
Nov 14, 2016 near Sudden…, WA


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