The NipMuck Trail runs 36 miles from Mansfield, CT to the MA state line in Union, CT. The race course follows a 13 mile segment in the middle starting on Perry Hill Road in Ashford. The marathon runs south for 6.2 miles down to Rt 44, then back to the start, then north for 7 miles to Boston Hollow Road, then turns around and back to the finish at Perry Hill Road.