Sponsored by the Squannacook River Runners and Groton
There are two trail races: 3.4 miles and 9.5 miles.
The courses are well marked, tour the scenic Groton Town Forest, and have no road crossings. They are a combination of narrow dirt roads and winding single lane trails, with lots of roots, rocks, leaves, uphills, and downhills. The hills are not large (though some are steep) but they offer a distinct challenge.

More information here http://www.grotontftr.freeservers.com/index.html and registration here: https://www.runreg.com/groton-town-forest-trail-races