Northeast of San Bernardino and Lake Arrowhead in the San Bernardino National Forest, the Forest OHV System (aka Big Bear OHV) consists of 36 miles of OHV trails and 169 miles of forest roads (open to green sticker/red sticker usage). The trails are primarily in the Cajon, Arrowhead and Big Bear areas. There is a smaller system in the San Jacinto area.
The best trailheads are: Pinnacles Staging area near Lake Arrowhead, Cactus Flats Staging area near Big Bear, Big Pine Flats Campground, Horse Spring Campground, and Crab Flats Campground
Note: The forest does not have open areas for hill-climbing activities, cross country travel or motor cross tracks for racing.
A good place to start exploring is the Pinnacles Staging Area. The Pinnacles Staging Area is located north of Lake Arrowhead on SR173. Note: As of September 2007, a rough section of SR173 has been reported closed -- that section is about 8 mile west of the trailhead. Make sure to approach the trailhead on SR173 from the east.
Note: As of September 2007, ATV riding is only permitted on designated Forest Service roads as long as the ATV has a valid California green ATV sticker. To obtain a map with the designated roads, contact the Forest Service HQ at (909) 382-2600.
Overall, Forest OHV System / Big Bear OHV is the 4th most popular ATV riding trail of all 106 ATV trails in California.