West of Fort Collins and east of Walden, the 71,000 acre Colorado State Forest State Park has 80 miles of 4WD trails through unaltered forest, jagged peaks and alpine lakes. The popular family routes include the Bull Mountain Road and the Bockman Road. If you are looking for more challenge, try the Montegomery Pass Road. In any case, make sure to exercise caution when riding ATVs in this area -- there are numerous accidents every summer.
To reach the Colorado State Forest from Fort Collins, head west on SR14 for 75 miles across Cameron Pass.
Ruby Jewel Route (4 miles one-way) has about 800 feet of elevation gain to a peak altitude of 9,150 feet. Most passenger vehicles can travel the first mile to the car parking area or the Ruby Jewel Yurt. 4X4's can continue for another two miles where the route dead-ends at the Ruby Jewel Trailhead. Dispersed vehicle camping is permitted.
Bull Mountain (7 miles one-way) offers something for all riders. It follows an old logging road through the forest and makes a steady ascent up Bull Mountain. At 4 miles you can branch to the right to access North Michigan Reservoir. The left fork continues for another 2 miles along a jeep road. In the winter this trail is packed and groomed for snowmobiling.
Diamond Peaks Route (7 miles one-way) has about 1,250 feet of elevation gain throughout the route. Perfect trail for ATVs or motorcycles in the summer. This is a popular destination in the winter for extreme skiing. High avalanche-prone areas.
Bockman Road (6 miles one-way) has about 1,230 feet of elevation gain throughout the route. This road climbs above 10,000 feet getting more difficult toward the top. Then it descends to Highway 14. Great winter trail for skiers and snowshoers looking for a strenuous workout. This trail is also a popular groomed snowmobile route.
Montgomery Pass Route (4 miles one-way) has about 2,430 feet of elevation gain to a peak altude of 9,020 feet. This trail is a true 4X4 drive experience. Vehicles will encounter lots of rock, dips and steep conditions. At it ends it's only a short walk to the top of the ridge for spectacular views. Used to access Montgomery Pass Yurts & Trail. Dispersed camping.
Mendenhall Route (8 miles one-way) has about 2,000 feet of elevation gain to a peak altitude of 8,600 feet. Route is popular for hunters and can be used to access Medicine Bow Trail, Route NF and the N. Sand Dunes. Dispersed vehicle camping is permitted. Spectacular views await at the top of the ridge - you can see all the way to WY and west to Mount Zirkel.
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Out-of-state residents who bring OHVs into Colorado must purchase a Colorado Non-Resident OHV permit which is valid from the date of purchase through the following March 31. These permits can be purchased anywhere you get your hunting/fishing licenses in Colorado. All off-highway vehicles must have an approved muffler and spark arrester. These requirements are subject to change so make sure to contact the Colorado State Parks prior to using your off-highway vehicle.
Overall, Colorado State Forest is the 15th most popular ATV riding trail of all 90 ATV trails in Colorado.