North of Portsmouth and northwest of York, the Mount Agamenticus area has a 6.4 mile out-and-back trail open to ATV riding. The ATV trails at Mount Agamenticus follow a blue blaze.
To reach the trailhead from the south including Portsmouth, head north on US95 to Exit #7. Head across the bridge to the west side of the highway. Turn right heading north on Chases Pond Road for 3.5 miles. Turn left heading west on Mountain Road for 2.7 miles. At this point, you should reach an intersection with the Mount Agamenticus access road. Continue west past the access road onto a dirt road (which was signed Road Closed Ahead) for about 1.5 miles. There is a parking area on the right side of the road next to the trail.
Overall, Mount Agamenticus is the 15th most popular ATV riding trail of all 22 ATV trails in Maine.