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Routes
Hiking trails & Routes
United States
Washington
Whatcom County
Sudden Valley

Stimpson Main Loop Trail

Easy

4.8

(1239)

10,703

hikers

Stimpson Main Loop Trail

01:22

4.92km

90m

Hiking

Step into a truly wild and ancient forest on the Stimpson Main Loop Trail, a rewarding hike near Bellingham. This route takes you through a diverse temperate rainforest, showcasing towering Douglas Fir trees over 400 years old, western hemlock, and redcedar, all surrounded by a vibrant undergrowth of ferns. You'll…

Last updated: June 9, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Lake Louise Natural Resources Conservation Area

Stimpson Family Nature Reserve

Waypoints

A

Start point

Parking

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1

1.46 km

Stimpson Main Loop Trail

Highlight (Segment) • Trail

The forest along the trail is largely undisturbed and displays characteristics of an old-growth forest, including Douglas Fir trees over 400 years old!

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4.92 km

End point

Parking

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Way Types & Surfaces

Way Types

4.85 km

< 100 m

Surfaces

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Elevation

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Highest point (240 m)

Lowest point (160 m)

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Weather

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Today

Saturday 4 July

19°C

11°C

18 %

Additional weather tips

Max wind speed: 19.0 km/h

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Frequently Asked Questions

How long does it typically take to hike the Stimpson Main Loop Trail?

The Stimpson Main Loop Trail is approximately 4.9 kilometers (3.05 miles) long. Most hikers complete the loop in about 1 hour and 22 minutes, depending on their pace and how often they stop to enjoy the scenery.

What is the difficulty level of this trail?

The Stimpson Main Loop Trail is generally considered to be of moderate difficulty. While it's not overly strenuous, it features rolling climbs and descents with some sections becoming steeper. It's suitable for hikers with some experience and active families.

What kind of terrain can I expect on the Stimpson Main Loop Trail?

The trail primarily consists of a well-defined singletrack. You'll encounter gentle slopes, some sections with roots, and small wooden bridges crossing marshy areas. During longer descents, the path can become rocky. While generally dry, a few spots might have mild mud. The initial 0.1 miles leading to the Beaver Pond Viewpoint are a fully accessible gravel path.

What natural features and wildlife might I see along the way?

This trail is renowned for its stunning old-growth forest, featuring Douglas Fir trees over 400 years old, western hemlock, and redcedar. You'll pass through dense forest, moss-covered areas, vast fern fields, and wetlands, including Beaver Pond and Geneva Pond. The reserve is home to beaver, deer, cougar, various birds like pileated woodpeckers and wood ducks, owls, frogs, and snakes. After heavy rains, small streams and waterfalls add to the picturesque landscape.

What is the best time of year to hike the Stimpson Main Loop Trail?

The Stimpson Main Loop Trail is a great option year-round. It's particularly notable for often remaining dry even when other local trails are muddy, making it a good choice after heavy rains. The old-growth forest offers beauty in all seasons, with wild mushrooms appearing depending on the time of year.

Are dogs allowed on the Stimpson Main Loop Trail?

No, pets are prohibited on the Stimpson Main Loop Trail and throughout the Stimpson Family Nature Reserve. This regulation helps preserve the undisturbed natural environment and protect the wildlife.

Do I need a permit or pay an entrance fee to access the Stimpson Family Nature Reserve?

No, there are no permits or entrance fees required to hike the Stimpson Main Loop Trail or visit the Stimpson Family Nature Reserve. The reserve is dedicated to preservation and is open for public enjoyment.

Where can I park to access the trailhead?

Parking is available at the trailhead for the Stimpson Family Nature Reserve. There is a privy (restroom) located at the trailhead for convenience.

Are there any specific viewpoints or notable landmarks on the trail?

Yes, the trail offers glimpses of Lake Whatcom through breaks in the trees. You'll also encounter two prominent ponds, Beaver Pond and Geneva Pond. The primary highlight is the undisturbed old-growth forest itself, with ancient Douglas Fir trees over 400 years old. Interpretive signs along the way provide insights into the natural surroundings.

Does the Stimpson Main Loop Trail connect with other paths?

Yes, the route primarily follows the Stimpson Main Loop, covering about 94% of it. It also briefly passes through a section of the Moto's Run trail for about 6% of its length.

Is there a recommended direction for hiking the loop?

If you prefer to tackle a sustained climb earlier in your hike, consider traversing the loop clockwise. This direction involves a climb for about a mile. However, the trail is enjoyable in either direction.

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