The Mount Washington Road Race, a foot race, is traditionally the third Saturday in June. Registration is traditionally March 1-15.
Heres’ the official site:mountwashingtonroadrace.com
This is from the site in 2013 headlined “1,300 runners, 34 states, 7.6 miles all uphill”:
This Saturday the Northeast Delta Dental Mt. Washington Road Race will welcome 1300 runners from 34 states plus the District of Columbia and the Canadian provinces of Ontario and Quebec for the annual 7.6-mile footrace to the summit of the highest peak in the northeastern United States. The race course, the Mt. Washington Auto Road, ascends from Route 16 to the 6288-foot summit of Mt. Washington at an average grade of 12 percent, with the additional challenge of the mountain’s notorious weather, which can include drastic temperature drops and high winds. Starting time is 9 a.m