The south end of the Grindstone Ranger District offers over 200 miles of some of the most enjoyable and challenging OHV routes in the nation. The "Mendocino OHV Corridor" is a designated 40 mile, east-west route across the south end of the Forest connecting the Stonyford OHV Staging Area and the Upper Lake OHV Staging Area. The riding area varies in elevation from 1,700 feet (at Fout Springs), to almost 6,000 feet (near Goat Mountain). Vegetation varies from low elevation chaparral to tall pine and fir forest in the high country. The Grindstone Ranger District is not an OHV "park". Off-highway vehicle recreation is just one of the many uses allowed on National Forest lands. Please be considerate of others you may encounter in the forest. Low Resolution Map of Stonyford OHV Area (pdf 1.35mb)
If you like trail riding and camping this is the place to go. Nice creeks run through the camp grounds and the sites are nice for tent and trailer camping.
If your looking for single track dirt bike trails go somewhere else. Most all the trails are quad width and not challenging at all. Every area with potential is barricaded off. Pretty boring place to ride in my opinion.
Endless trails of all skill levels. Long loops. Don’t ride alone and be sure to pack and prepare for the unknown as if you’d have to sleep on the trail overnight as it’s got some remote trails that, should you break down, you’ve got a long ways to go to get back to the staging area. That said, I love this place.
This is the mecca of NorCal off-roading. Huge place with wonderful trails. Be aware that it is a *challenging* place to ride; most trails have long Black Diamond sections and demand your best skill. But that's what makes it Awesome!!!
If you have newbies, they can do a 30 mile loop on M5. The nice thing is that this forest road is criss-crossed by challenging trails, and so both experienced and inexperienced riders can kinda do a loop together.