This is the first resource listed here because they are a great resource for all things trail related.  Joining NEMBA means getting involved with trail advocacy, tons of group rides and mountain bike festivals & events, and just tons of people who love the dirty life. so what are you waiting for. Check it out!
Truly a gift to the mountain biking world.  Ask anyone who has ridden this place including us and they will tell you it is some of the most incredible riding anywhere.  It holds its own against the epic hotspots of the world like Moab, Sedona, Whistler, and Fruita.  You should not miss an opportunity to see what this is all about.  Located right in Burke VT.
Willowdale S.F. in Topsfield & Ipswich has an incredible trail network that impresses the most experienced riders as well as the eager noob. Regardless of skill level, there is tons of fun to be had here. Located right across from Marini farmstand in ipswich, or the topsfield road entrance near Bradley Palmer. This is truly a park in the middle of lots of trails so get out and explore!
Highland MTB Park has everything from Dirt Jumps to lift access gnar. They have classes as well as rentals so any one can go enjoy this awesome resource right up in NH not to far away from us.

Lynn Woods Reservation

Lynn woods is probably one of the most well know places to ride because it is right outside of Boston and has been ridden for a long time.  There is a lot of technical riding and a lot of fire road type doubletrack you can do as well so do not hesitate to go down there and explore.  Nemba leads many rides throughout the year.  This link takes you to the lynn woods entry on the Nemba page.