Thorp Mountain Trail is a 6.8 mile out and back trail located near Roslyn, WA and is rated as moderate. The trail is primarily used for hiking and is accessible from June until October.
My wife and I took our 7 month old on this loop last Thursday. We started at the gate, went up to Little Joe Lake and had lunch, and continued to Kachess Ridge, connecting with the Thorp Mountain Trail for our descent. The hike up to Little Joe Lake was just that, up. There were few flat spots until you nearly reached the lake. We lost the trail once in a group of blow downs but found it easily as it had been traveled a time or two already this year. The other was through a slide area and was easily found. After lunch at the lake, which I was glad we had bug spray, we continued up the Red Mountain Trail. There were a few good ascents and descents, finally coming to a ridge top overlooking a clear cut. Prior to reaching that, we spooked a moose that had been bedded down. If there was a mistake in identifying it by its look (clearly a moose, about 6 feet tall, huge shoulders, and a nice, wide bowl rack) there was no mistaking it for a deer or elk as it sounded like a freight train had derailed and made its way through the backcountry. Since we had the little one, I was just glad it spooked. My wife claims to have heard a bear grunting off of the trail about a mile after the moose, which I believe. The sound was confirmation enough for me, I didn't need to stick around to see it. There were also several blueberries to this point, some of which bled from the moment you picked them and were delicious to still being tiny green things. Toward the end we had a view of about the top quarter of Rainier. Once we hooked up with Kachess Ridge it was a quick jaunt over to the Thorp Mountain Trail. Due to time we didn't take the spur up to the lookout. I can see the ascent of the last quarter or so of the Thorp Mountain Trail being tough. I was thankful we only had it on the downhill. We saw two deer on this portion of trail. The whole loop in general was dry as a bone. Most of the creeks appeared to have been dry for some time. Overall it was a good hike. Being spray and water.