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    Boulder River Trail

    4.2 (11 reviews)

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    Photo of T A.
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    11 months ago

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    12 years ago

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    11 years ago

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    8 years ago

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    11 years ago

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    5 years ago

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    9 years ago

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    11 years ago

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    9 years ago

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    7 years ago

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    Photo of Elle S.
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    10 years ago

    Nice, easy enough trail for hikes with kids and dogs. Hear that it can get a little mucky when it rains. Check WTA for trail updates

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    Review Highlights - Boulder River Trail

    to creep up the road - it was probably 1 mile at the most by car - the gravel road from the highway to the trailhead I mean.

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    Thunder Knob Trail - Instagram: @telephonesmoothie

    Thunder Knob Trail

    4.4(7 reviews)
    41.9 km

    Spontaneous Saturday trip to Diablo Lake in Northern Washington but we parked and stayed in Thunder…read moreKnob Trailhead. We drove for almost 3 hours, but when we were looking for a place to park, I lost my signal sevice! Diablo Lake is big and long! We found a spot to relax and swim, but the water was 10°C (so cold, hahaha!). It's still a gorgeous place to visit! Remember, it's better with chairs, snacks, kayaks, paddleboards, and drinks! It's so nice to set aside city and technology life! Just for sure, we are looking to rest and swim and not to hike! But still it is a beautiful nature to see

    A vibrant trail with some sensational views! The Thunder Knob trail is a short but moderate 3.5…read moremile out and back trail that's located within North Cascades National Park. The trail begins just behind Diablo Lake and crosses over the beautiful rushing waters of Colonial Creek. It then begins to gently switchback through a lush forest that's filled with beautiful Douglas Fir and Western Hemlock trees. The trail is mostly shaded but features a few breaks within the trees that will reveal some amazing glimpses of the snowcapped mountaintops. As you ascend up the trail, you're rewarded with gorgeous views of the forest and mountains. The forest vegetation is super versatile. I was able to spot daisies, ferns, Western Hemlocks, Douglas Firs, an array of different wildflowers, and so on. The views are the best at the top, of course. There's this stunning vista point that features an aerial view of Diablo Lake with the striking North Cascades Mountain Range in the background. If there was ever a time to get a photo while on this hike, THIS is where you need to do it. It's simply breathtaking to witness. This is also a great spot to bring a picnic and/or take a lunch or snack break for heading back down to finish the second half of the hike. What I genuinely loved about this trail (aside from the views) was how incredibly green it is. The vibrancy is out of this world. Also, to see how clear Diablo Lake is from the top is just insane. It doesn't even look real, but it definitely is! The best part about hiking this trail is being able to literally walk right down to lake to relax after you've finished your hike. It's the perfect reward, and hiking this trail was truly a wonderful experience.

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    Thunder Knob Trail - Instagram: @telephonesmoothie

    Instagram: @telephonesmoothie

    Thunder Knob Trail
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    Boulder River Trail - hiking - Updated August 2026

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