Mill Valley Campground
Open — Open year-round on a first-come, first-served basis. Water is OFF for the season; bring your own water. Off-season rate of $5 per night currently in effect. No trash services during winter; pack out all garbage. Access may be limited due to M10 Road construction.
Wet weather trail closure in effect on Grindstone District
A wet weather closure is in effect for Stonyford OHV trails on the Grindstone Ranger District, as of 10am, Dec. 23. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Wet weather trail closure in effect on Upper Lake District
A wet weather closure will go in effect for OHV trails on the Upper Lake Ranger District, as of 8am on Dec. 20, 2025. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Stonyford Office Hours Changing
The Stonyford Office's visitor services hours are changing beginning Jan. 5, 2026. Starting next year, the office will be open from Monday-Friday and closed Saturday-Sunday. Office hours are 8:30-4pm with a lunch break 12-1pm.
M10 Road Construction
The M10 road will be closed Monday, Nov. 17- 20, 2025. Closure location is above Fouts Springs near Dixie Glade. Main impacts are to the Letts Lake basin on Grindstone Ranger District. Detour to get to Letts Lake is via the M5 and 17N02 Roads, high clearance vehicle recommended.
Trail 34 on Upper Lake District closed due to unsafe conditions
OHV Trail 34 is closed due to trail tread degradation and rutting that runs 300 feet down the trail. The trail is unsafe due to unstable soil, extremely muddy conditions and increased runoff.
Trail 3 on Grindstone closed due to slide
Trail 85303 (Trail 3) on the Grindstone Ranger District closed due to landslide: Trail 85303 is closed between Trail 85304 and M5 Road for public safety and to protect natural resources. Unstable soil, downed trees and a steep drop off make this trail unsafe for users.
Cedar Camp Campground Closure
Cedar Camp Campground is closed for public safety. Closure is in effect through 6/18/26.
Chico Seed Orchard Public Use and Access Closure
Pets must be on a leash. Fall/winter hours are 7 a.m. - 5 p.m. beginning Nov. 1. Spring/summer hours are 7 a.m. - 7 p.m. A closure is in effect outside of these hours.
About
Mill Valley Campground sits at approximately 3,900 feet elevation in the Grindstone District of Mendocino National Forest, offering 15 campsites designed for OHV recreation. Located one mile north of Letts Lake and 17 miles west of Stonyford off Road 17N02, the campground features recently renovated facilities including new picnic tables, fire rings, and barrier systems. Each site can accommodate up to two vehicles and medium-sized trailers up to 24 feet. The campground serves as a hub for off-highway vehicle enthusiasts, with an OHV trail leading directly in and out of the campground and access to the extensive trail system in the Stonyford Recreation Area. The surrounding landscape features mixed coniferous forest with chaparral. The campground operates on a first-come, first-served basis year-round, with fees of $10 per night during the main season (May-September, Memorial Day to Labor Day) and $5 per night during the off-season. Facilities include vault toilets and picnic tables with fire rings at each site. Water is turned off for the winter season, so campers must bring their own. The campground now offers Scan & Pay technology for convenient payment via QR code at the kiosk. During the summer months, trash services are provided, but during winter, campers must pack out all garbage. Quiet hours are enforced from 10:00 p.m. to 6:00 a.m., with check-in at 2:00 p.m. and check-out at 11:00 a.m.
Directions
Located 17 miles west of Stonyford and one mile from Letts Lake off Road 17N02.
Nearby Campgrounds
Amenities
| Water | No |
| Fires Allowed | Yes |
| Toilets | Yes |
| Dump Station | No |
| Wifi | No |
| Pets Allowed | Yes |
| Showers | No |
| Electric Hookups | — |
| Water Hookups | — |
| Sewer Hookups | — |
| Camp Store | No |
| Price | $5 |
Vehicle
| Max RV Length | 24ft |
| Max Trailer Length | 24ft |
| Big Rig Friendly | No |
| Pull Through Sites | No |
Contact
| sm.fs.mendopao@usda.gov | |
| Phone | +1 (530) 963-3128 |
Cell Service
| AT&T | None |
| Verizon | None |
| T-Mobile | None |
Useful Links
| View on Recreation.gov |
Availability
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