Mt. Greylock summit via Thunderbolt Trail

HARD 50 reviews

Mt. Greylock summit via Thunderbolt Trail is a 5.6 mile lightly trafficked out and back trail located near Adams, Massachusetts that features a waterfall and is only recommended for very experienced adventurers. The trail is primarily used for hiking, walking, nature trips, and birding and is accessible year-round. Dogs are also able to use this trail.

DISTANCE
5.6 miles
ELEVATION GAIN
2273 feet
ROUTE TYPE
Out & Back

dog friendly

birding

hiking

nature trips

walking

views

waterfall

rocky

The trail starts from parking area up to AT via Old Summit Road. A little confusing with the skiing signs, but head east up to AT. Hike along AT to a point where Thunderbolt ties in, and make a push up to the summit of Greylock. Take the thunderbolt trail north until you reach the Appalachian trail (marked while), where you will turn left until you reach the Mt. Greylock summit. The Thunderbolt Trail was originally a CCC built ski trail, and in 1936 hosted the United States Eastern Alpine Ski Championships. Its current course has been somewhat altered from the original, but is no less challenging. The Thunderbolt Foot Trail climbs gently west winding through the forest south of Hoxie Brook, and eventually the foot trail will intersect the old ski trail on your right. At about the half mile mark, the trail becomes considerably steeper and heads northwesterly towards the summit ridge. This stretch is quite broad and is recognizable as a steep, tree-lined ski run. At about the 1.5 mile mark the trail reaches the summit ridge, where you have a beautiful view upon the town of Adams from Hadley Lookout.

hiking
1 day ago

2 days ago

I like this little hike - highest point in Massachusetts. Agreed on the trail marking being inconsistent - last time through I found myself down bank of the trail in thick ferns and forest. Great view at the summit.

hiking
3 days ago

A nice little day hike. Surprisingly steep in some spots. Some confusion as to the actual trail you're on, especially at first. There is a lot of signs, but still not exactly clear where you are at times? I will just say if it's real steep you're on the Thunderbolt trail. If not, something else.

hiking
5 days ago

hiking
14 days ago

hiking
27 days ago

This was a fantastic hike, although I'm 99% certain this trail is mislabeled. The map for this hike is not Thunderbolt, it is the Bellows Pipe trail. Thunderbolt starts on Thiel Rd, the hike on this map starts at the lot on Gould Rd, which is where Bellows picks up. The map here takes Bellows the whole way up and intersects with Thunderbolt about 40 mins into it. Once we were up at the summit, we followed the signs for Thunderbolt on the way down, and it was completely different and much much steeper than our ascent.

That said, this is a great hike. Bellows Pipe is steep and sustained, so it's a crazy workout.

hiking
28 days ago

Thunderbolt is the steepest, most direct of the summit trails. The lower portion of the Thunderbolt trail called "The Bumps" is accessed using the Bucket trail off the Bellows Pipe South trail. The upper sections of Thunderbolt are calf-busters, but you'll be on the summit in 1:15. An easier-on-the-knees descent is an offshoot of the Bellows Pipe trail that runs behind the Big Bend emergency shed and gradually makes its way down the Thunderbolt slope. It adds only a few minutes. This is actually the trail that's listed in the description on this site, but the true Thunderbolt Ski Trail is more direct, and clearly marked.

hiking
1 month ago

hiking
1 month ago

hiking
1 month ago

1 month ago

rocky and quite muddy this time of year, wear boots ke bring extra socks!

2 months ago

2 months ago

2 months ago

hiking
2 months ago

BEAUTIFUL!!!!

2 months ago

Relatively difficult yet satisfying when you reach the summit. Awe inspiring

hiking
3 months ago

hiking
3 months ago