From Route 93 South:

Take Route 93 to Exit 27 (Somerville/Mystic Ave.)
At the end of the ramp, go Left onto Mystic Ave.
Follow to set of lights after St Polycarps Church, turn Right onto Temple St.
Follow Temple St. to end and turn Right onto Broadway
Follow Broadway up over the hill. Trum Field is about 1 mile on the Right at approx. 560 Broadway