Cache Creek ridge trailhead is just off CA20, about a 20 minute drive from Clearlake CA, which is about 40 miles north of Santa Rosa. This 27,294 acre wilderness area is part of a 109 million acre National Wilderness Preservation System and has no fees or permits for entry. A fire permit is required – including for stoves. See Bureau for Land Management to current fire restrictions. Exercise Leave No Trace principles.
More information from the Bureau of Land Management here.