Mount Monadnock is the northern terminus of the Metacomet-Monadnock Trail (also known as the "M&M Trail"), a hiking trail stretching south through Massachusetts to the Connecticut border. The trail ascends the mountain from the southwest; however, there is no trailhead where that trail crosses Route 124 at the foot of the mountain, and the highway there is marked with "no parking" signs. The closest trailhead southbound on the M&M Trail is on Bullard Road, which leads south from Route 124 half a mile west of the M&M Trail's crossing of the state highway.