Middlesex County, Massachusetts, United States
4.2 miles (6.8 km) · 517 ft elevation gain · Loop · trail · Route
Rock Circuit Trail, Middlesex Fells (MA) covers 4.2 miles across Middlesex County, Massachusetts, United States. Runners face 508 feet of climbing with 518 feet of loss. Elevation gain averages 130 feet per mile. The course is 81% runnable, with the remainder requiring hiking on steep or technical sections. Trail comprises the majority of the course. The course features very hilly terrain. The course difficulty of 11.1 puts it in the top 31.980000000000004% of challenging routes at this distance. Popular among trail runners and hikers seeking Massachusetts adventures.
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