Thornton Lakes Trail is a 19 mile lightly trafficked out and back trail located near Marblemount, Washington that features a lake and is rated as difficult. The trail is primarily used for hiking, walking, and backpacking and is accessible from June until September.
Directions from Marblemount: Drive east on Highway 20 11 miles to dirt road on the left signed as Thornton Creek Road. Turn northward and drive 5 miles to the trailhead. Thornton Creek Road is not recommended for trailers or RVs. It isn't graded regularly and is very steep.
Picturesque. Hard hike, but totally worth it.
Quite the challenge, but worth it. The views are amazing, and the lake at the end is jaw dropping.
Trailhead to Trappers Peak. Snow free all the way to the glacier on Triumph as of 10/19.
My wife and I went on this hike in late August. The first 2 miles are light slope and then the last 3 miles are a steep ascent of about 2000 ft. It was hard but worth it for the beautiful views at the top. We stayed the night and camped back in the morning. I would do it again but stay for at least two nights to give enough time to visit the surrounding peaks and go to the upper lakes.
Strenuous hike to the top but well worth it for the views. We all went down the narrow steep trail to the lake and saw chunks of ice and a beautiful lake close up. We the went back up the trail and took on Trapper peak. Because of snow, the trail was on and off but we got to the top and the view was awesome.
The first mile starts out flat. All uphill switch-backing through the trees the rest of the way. At around 5 miles you will come to a post in the middle of the trail marking Thornton Lake to the left and Trappers Peak to the right. The view of the first lake is a short distance from there. If you continue all the way down to the lake the trail narrows greatly and can be slippery. If you are short on time I recommend enjoying the lake from the main view point and save your energy for scrambling up to Trappers Peak. You will have to climb up a steep and narrow rock ledge before it levels out, but it is doable and not technical with a well defined trail. The view of the Pickett range, Mt Triumph and the other 2 lakes is an absolute must and 5 stars. I saw a black bear near the top.