Greater Portland & Casco Bay

This headquarters for Maine Audubon is just a few miles from Portland, located along the Presumpscot River estuary. It has an environmental center and a 65-acre sanctuary with two miles of trails winding through woods, meadows, and salt marsh. Trails are open for cross-country skiing and snowshoeing. All trails are gentle with no steep grades. The main trailhead is located just outside the Visitor Center. From there, hikers and skiers and snowshoers may get access to all the trail spurs, junctions and main trail loops. Trail guide and map.
Hours: Trails open daily, dawn to dusk. Nature center open daily, 9 a.m.-5 p.m.; Sunday, noon-4 p.m.

Pineland Farms is a working farm, business campus and educational and recreational venue. IT has 5,000 acres of woodlands and fields open to the public for various outdoor activities. Thirty kilometers are open for biking, walking, trail running, mountain biking, tennis, Nordic skiing, snowshoeing, ice skating.
Day and half-day skiing and snowshoeing passes range from $4 to $13. Season passes are available. Equipment rentals and lessons. If weather and snow conditions permit, ski trails are open daily from 8 a.m. to 5 p.m.