Though it certainly isn’t hidden, it’s fair to say the Lawrence Woods is a “hidden gem” of the Middlesex Fells Reservation.

The inaugural 12 Hours of Lawrence Woods took place on Saturday, July 19, 2025, in the Lawrence Woods section of the Middlesex Fells Reservation in Medford, Mass. Runners had 12 hours to complete as many 4.5-mile trail loops through the Lawrence Woods as they wanted, all for an entry fee of just $12.