Northfield Mountain has more than 25 miles of trails designed specifically for cross country skiing and groomed for both classical and free-style skiing. Our trails offer some of the finest Nordic skiing in the region, from beginner trails to the demanding 800-foot vertical climb of Tenth Mountain Trail. Hikers, dogs and other pets are excluded from our trails during the ski season. Hours of Operation: Wednesday through Sunday 9 a.m.-4:30 p.m. Always call ahead to our 24-hour Snow Phone for the most current conditions: (800) 859-2960 or check our Trails Report on our Facebook page which is updated daily. Trail system closed to all users Mondays and Tuesdays, except holiday openings.