Mt Greylock, Thunderbolt Trail (MA)

Berkshire County, Massachusetts, United States

13.0 miles (21.0 km) · 3,543 ft elevation gain · Loop · trail · Route

Route facts

Distance	13.0 mi (21.0 km)
Elevation gain	3,543 ft (1,080 m)
Average gain	272 ft per mile (52 m per km)
Longest climb	2.1 mi, 2,297 ft of gain
Steepest climb grade	39.6%
Runnable	59% of the route
Climbs / descents	2 climbs, 3 descents
Profile shape	Up, then down
Difficulty score	11.6 of 100
Surface	trail
Route shape	Loop
Type	Route

Grade breakdown

Grade band	Share of route
Flat	33%
Moderate uphill	13%
Steep uphill	15%
Moderate downhill	26%
Steep downhill	13%

Questions about Mt Greylock, Thunderbolt Trail (MA)

How much elevation gain does Mt Greylock, Thunderbolt Trail (MA) have?

Mt Greylock, Thunderbolt Trail (MA) has 3,543 ft (1,080 m) of elevation gain over 13.0 miles (21.0 km). That averages 272 ft of gain per mile.

How difficult is Mt Greylock, Thunderbolt Trail (MA)?

The difficulty score for Mt Greylock, Thunderbolt Trail (MA) is 11.6 of 100. That is harder than 75.2% of routes at a similar distance. About 59% of the route is runnable at typical trail effort; the rest is steep enough that most runners hike.

What is the longest climb on Mt Greylock, Thunderbolt Trail (MA)?

The longest climb on Mt Greylock, Thunderbolt Trail (MA) runs 2.1 miles (3.4 km) and gains 2,297 ft (700 m). The steepest climb grade on the route is 39.6%.