Thunder Knob Trail

EASY 66 reviews

Thunder Knob Trail is a 3.3 mile moderately trafficked out and back trail located near Marblemount, Washington that features a lake and is good for all skill levels. The trail is primarily used for hiking, walking, nature trips, and birding and is best used from March until November. Dogs are also able to use this trail but must be kept on leash.

3.3 miles
666 feet
Out & Back

dogs on leash

kid friendly



nature trips





wild flowers

3 days ago

Popular hike, busy on weekends

7 days ago

Great easy out and back hike. Great views! Recommended

17 days ago

Beautiful views from the top

20 days ago

The trail was pretty easy with great views of mountain peaks most of the way. The views of Diablo Lake are amazing. Definitely wear good, supportive shoes to make your life easier, lots of lose rocks that can make it tricky for someone older or not so graceful.
No complaints at all and will be back!

27 days ago

Simple hike. Don't let the creeks in the beginning stop you from this one. They aren't too difficult to cross especially with trekking poles.

2 months ago

nice hike up very beautiful views.

8 months ago

hiked on Friday for sunset, still no snow and very beautiful

8 months ago

Easy hike with a few great lookouts

9 months ago

Very relaxed hike with gorgeous lake views at the top.

10 months ago

Awesome easy trail to hike with the family or the kids! The best views are at the top!

10 months ago

Well maintained trail, nice stretch off the legs when traveling the North Cascades Highway. View from the top of Diablo lake is very good. the information sheet at the North cascade visitor center had the elevation gain at 425 feet, listed on all trails at just over 700, it feels more like the latter.

10 months ago

This is a very pretty trail with beautiful views of snowy peaks. It's fairly easy to do, and very kid friendly. The end of the trail is nothing special compared to what you see all along the way, Well worth a detour, especially if you have kids.

10 months ago

Great out and back trail leaving from the campground. Perfect for families with children 6 and up. Great views of the lakes and peaks along the way.

11 months ago

Easy beautiful hike. Loved it!

11 months ago

Cool trail, lots of unique vegetation and different areas. Good view from top.

Saturday, June 10, 2017

Short with great views from the top

Tuesday, May 09, 2017

Well this trail is completely washed out as of may 5 2017. Water is too strong and deep to even attempt to cross. The surrounding area is serene enough though and I saw a grizzly bear near the trail head.

Friday, November 18, 2016

View of Diablo lake at top is awesome, easy hike a little elevation gain. my 11 year old & 70 year old mother nature law stopped half way up. I jogged up the rest with my husband so we could see the views.

Sunday, July 31, 2016

I took my eleven year old son and my 3 year old lab. Perfect length and elevation gain for minimal complaining. :) beautiful view of the lake from the top. Well maintained trail.

Thursday, June 09, 2016

The Thunder Knob trail presents a cool, relatively easy trail with a consistent but gradual incline, and results in some rather grand views of an already pristine area.

The trail begins at the north loop of the Colonial Creek campground. It immediately takes you over and across Colonial Creek, which with the recent late Spring thaws, was rather powerful. After crossing the creek you're taken through a gorgeous old growth forest and eventually you start to climb various hillocks and rises until you reach the trail's end.

At one point about halfway through there is an absolutely gorgeous promontory, looking out against Colonial Peak and a heavily wooded valley. It's an ideal resting place for sure.

Eventually, the trail dips down past the hidden Thunder Lake (which is really a long pond), and rises up again to end at the eponymous Thunder Knob, which overlooks Diablo Lake. Rest here and absorb all that this perfect vision of nature has to offer, and then return to the trailhead, knowing that the way back is much, much easier.

Sunday, September 27, 2015

Nice trail and relatively easy hike. Good views of Diablo Lake along the way.

Saturday, September 26, 2015

Thunder Knob is a cool trail in the Diablo/Ross lake area. The hike has a little of everything from mountain creeks to an old growth forest covered in moss, and an alpine woods at 1800 some odd feet. Easy walk to stretch your legs after a trip on Rt. 20 that will not disappoint.

Sunday, May 10, 2015

The Forest Service has installed the foot bridges. They have built new sturdy ones, but don't have the rustic character of the old ones. We started the hike around 6 pm, for a nice evening hike. The water level in the streams was very low for this time of year, the wildflowers are just starting to bloom, the mountains were majestic and Diablo Lake was stunning as always. We were able to just soak up the beauty from the top and enjoy the company of our group.

Wednesday, July 09, 2014

The trail itself was great and well maintained. It was a slow gradual climb all the way to the top, not very difficult. There were a few nice views of the surrounding high mountains/ waterfalls about half way up. At the top there was one nice view of Lake Diablo looking towards the dam. The two other viewpoints at the top were okay but obstructed by trees. My 3 yr old made it to the top with no problems but had to be carried down. Overall a nice hike on a nice day but the trail was very crowded but considering it was Saturday of the 4th of July what did I expect.

Sunday, June 15, 2014

This was a nice hike. It had a lot of wildflowers blooming. The trail gradually, but steadily increases elevation until the top when there is a grand view of Diablo Lake. There were down trees on the trail, but easy to go over. Sadly, towards the top of the trail is many dead and dying trees (looks like the beatle infestation they have further up the pass).

Sunday, July 28, 2013

Just completed this with the family this weekend and we were sold after the log bridges over the creek. The climb was steady but mild throughout with no steep drop offs or overly intense climbs, making it a great match for our 4 year old. She was able to do it all on her own, which she was so proud of! The views at the top of Diablo Lake made it totally worthwhile and there were several viewpoints along the way to stop and let our 2 year old down to play and explore. We also really liked the change in elevation as it gave us a teachable moment about the forest canopy and the dried out creek bed and mini meadow/pond were great sparks for the curiosity of toddlers.

Thursday, September 13, 2012

Nice easy hike to do with kids and you get great views of Diablo lake and the surrounding peaks. One the way to the top there is a little pond and my son was able to gently catch a Northwest Tree Frog. A wonderful day in the mountains.

26 days ago

1 month ago

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