Mount Prospect, Mount Williams, and Mount Greylock Loop via Appalachian Trail

HARD 9 reviews

Mount Prospect, Mount Williams, and Mount Greylock Loop via Appalachian Trail is a 13.5 mile moderately trafficked loop trail located near North Adams, Massachusetts that features beautiful wild flowers and is only recommended for very experienced adventurers. The trail offers a number of activity options and is best used from April until October. Dogs are also able to use this trail but must be kept on leash.

13.5 miles
4,655 feet

dogs on leash





nature trips




wild flowers


If you're in great shape, this is a fantastic way to experience the best of Mt. Greylock State Park. It makes for either a really long, strenuous day-hike, or a moderate overnighter (note: the main campground requires reservations May through October, so check if you intend to do this). The loop starts at the Pattison Rd. crossing of the AT, ascends the northern spine of Mount Prospect 1,500 feet in just under 2 miles, continues to Mt. Williams, Mt. Fitch and the highest point in the state, Mt. Greylock, before plunging south on the AT to the Hopper Trail and down to the Money Brook. You'll descend 2,200 feet into what's know as "The Hopper," passing through the developed campground roughly halfway. You'll cross the Money Brook before finally ascending 1,400 feet in just over a mile up the gnarly, southern spine of Mt. Prospect, and trekking across its top en route to the return via AT north and the finish. After Mt. Williams and Mt. Fitch, before the final push up to Greylock, there's an interesting side-route called "Robinson's Point" where you can get a great view of most of Mt. Prospect from across the Money Brook ravine. It accounts for a little less than a mile of the total distance, but it's a neat trip through dense-growth forest, and the view from the point really sets the tone for the latter stage of this hike. Both ascents of Mount Prospect are challenging, and the southern area is definitely bear-country, so use caution and be prepared to turn back. The Money Brook trail to the AT via Wilbur's Clearing is a fine alternative to the southern section of the Mt. Prospect trail, and less strenuous, though far less rewarding.

1 month ago

Did this loop 6/24/18 as a training hike for a Yellowstone trip. Got a late start (1045). Knew thunderstorms were coming and was gonna cut it short after Mt Williams. Decided to do the entire loop regardless. Warm and muggy. I hike a lot..was carrying a 25 lb vest. This hike was hard. I was trying to beat the storms. It is very easy to miss the Mt Prospect trail going up the south slope off the money broom trail. I kept looking for it to branch off to the left after every stream crossing. Thank Godfor the gps. And speaking of going up the south slope of Mt Prospect...damn that was not easy. About 1200-1300 of ascent in about a mile. The thunderstorm did not help. There were no water sources really until Greylock. A couple beautiful views.

Finished in about 5.5 hours and it was a great training hike.

2 months ago

Did this loop with my small dog as an overnight trip, starting with the AT (south) to Mount Prospect, then staying at the Sperry Road campground. Completed the second half including Mount Greylock the next day. Unfortunately there were no views from Greylock due to the very foggy, misty weather, although it did make for a pretty quiet hike. Was definitely made more difficult by having an overnight pack, but I can see this being doable in one day without the pack as long as you begin early and are in really good shape. The trail was well marked the entire way, especially the AT sections.

3 months ago

This is a moderate loop that takes you over the largest peak in Massachusetts. It includes a Leanto 4 miles from the end for an overnight but this is doable in one day. Recommend starting early in the AM as we didn’t get to camp until about 5pm. Not much for wildlife other than small critters. Fire wood is available in season for leanto sight (not at the one we used). I recommend going in reverse and staying at the Wilbur Clearing leanto. There are serveral fresh water sources as well. This was a great hike and the trails are amazing as well as beautiful waterfall, one of which was right next to our campsite.

2 Guys and a Dog

2 months ago

11 months ago

Wednesday, July 12, 2017