Obsidian Flat
Inyo National Forest — lakeside, hiking
Location: LEE VINING, CA, CA
Price: From $20 per night
Rating: 3.8 out of 5 (8 reviews)
Season: May through October
Obsidian Flat Group Campground, located just outside of Mammoth Lakes, California, provides an opportunity for a group to enjoy a secluded getaway in the eastern Sierra Nevada Mountains. With a peaceful forested setting and mountain views, the campground’s location is perfect for relaxing and spending time in nature. The area is popular for exploring the surrounding forest and geology, as well as nearby hiking, bicycling, fishing and off-road vehicle riding options.The eastern Sierras are known
Cell coverage (FCC estimate): moderate signal. Actual signal may vary in remote areas. Best carrier: Verizon. Verizon 4G: 100%. AT&T 4G: 100%. T-Mobile 4G: 0%.
Amenities: Fire Rings, Picnic Tables, Vault Toilets, Bear Boxes
Availability alerts: Set a free cancellation alert at camperwatch.org/campground/obsidian-flat to be notified when sites open up.
Obsidian Flat Group Campground offers a secluded getaway in the eastern Sierra Nevada Mountains with a peaceful forested setting and mountain views. The site accommodates large groups with ample space and amenities including bear boxes, picnic tables, and vault toilets.
Wildlife alert: Lodgepole Chipmunk, Pacific Marten, Golden-mantled Ground Squirrel, Wood Thrush, Yellow-headed Blackbird, Osprey, and Northern Red-shafted Flicker have been documented in the area within 8km.
Insider tips for Obsidian Flat: Book early as this is a federal campground with high demand Group site easily accommodates 50+ campers in tents with 2 bear cabinets and multiple picnic tables Location is popular for exploring surrounding forest geology, hiking, bicycling, fishing, and off-road vehicle riding
Skip Obsidian Flat if: You need RV hookups — no hookups available; only suitable for self-contained RVs. You're visiting outside May through October — campground is seasonal. You prefer easily accessible locations — site is noted as somewhat difficult to find.
Best time to visit Obsidian Flat: May - October — Campground operates seasonally during these months only..
Nearby campgrounds: Reversed Creek Campground (June Lake, CA), June Lake (June Lake, CA), Agnew Horse Camp (MAMMOTH LAKES, CA), Oh Ridge (MAMMOTH LAKES, CA).
Cell Phone Coverage at Obsidian Flat
Cell signal at Obsidian Flat (LEE VINING, CA): moderate overall signal based on FCC broadband data. Best carrier: Verizon.
- Verizon 4G LTE: 100% coverage
- AT&T 4G LTE: 100% coverage
Coverage data source: FCC Broadband Data Collection (BDC). Actual signal may vary due to terrain, tree cover, and distance from towers. Camper reports are more reliable than coverage maps in remote areas.
Obsidian Flat Group Campground, located just outside of Mammoth Lakes, California, provides an opportunity for a group to enjoy a secluded getaway in the eastern Sierra Nevada Mountains. With a peaceful forested setting and mountain views, the campground’s location is perfect for relaxing and spending time in nature. The area is popular for exploring the surrounding forest and geology, as well as nearby hiking, bicycling, fishing and off-road vehicle riding options.The eastern Sierras are known for their exceptional trout fishing.
Verified facts
RIDB / Recreation.gov official databaseAmenities
RIDB /facilities /campsites · owner-verifiedStraight talk
CamperWatch intel · curated from camper reportsKnown issues, each with the workaround. Read before you book.
Insider tips & when to go
CamperWatch intel · hand-curated entryBook early as this is a federal campground with high demand
Group site easily accommodates 50+ campers in tents with 2 bear cabinets and multiple picnic tables
Location is popular for exploring surrounding forest geology, hiking, bicycling, fishing, and off-road vehicle riding
Campground operates seasonally during these months only.
Things to do nearby
RIDB /activities /recareas + intelConditions today
LiveCell signal
FCC BDC · quarterly datasetFCC maps are theoretical — camper reports confirm signal. Best carrier: Verizon.
Wildlife nearby
iNaturalist · research-grade · 8 kmLocation
Leaflet · OpenStreetMap tiles
Getting there →
Heading North From U.S. Highway 395 and State Highway 203 (Mammoth Lakes Junction), travel 8.2 miles north on 395. Turn west onto Deadman Road and follow for 3.2 miles to Upper Deadman Campground. Turn toward the Group Campground turnoff onto FS Road 2S05F. Continue one mile to the campground on the right. Heading South From U.S. Highway 395 and State Highway 158 (June Lake Jucntion South) travel approximately 6.5 miles south on 395 and turn right onto Deadman Road and follow for 3.2 miles to Up
Campground entrance
Google Maps APICommunity
#community · posts, photos & Q&A · AI-moderated (Claude Vision)Pro tips
- Book on recreation.gov exactly 6 months ahead at 10am ET — Inyo National Forest fills fast in peak season.
- Check current road conditions at Inyo National Forest before arrival — seasonal closures common.
- Bear country — store all food in bear boxes or locked vehicle at all times.
Frequently asked questions
RIDB facts + intel · FAQPage schema, speakableHow much does Obsidian Flat cost per night?+
What season is Obsidian Flat open?+
Does Obsidian Flat have hookups?+
What is the maximum RV length at Obsidian Flat?+
How do I make reservations at Obsidian Flat?+
What is the cell service like at Obsidian Flat?+
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●Data sources on this page
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