U.S. Forest Service · Sierra National Forest · CA
Onion Springs Overflow Camping Area
2Heads up2 fires, nearest 23 mi
Wildfire
Wildfire Training fire · 23 mi away · 0 acres · updated Oct 15, 2026
Wildfire
Dome fire · 29 mi away · 6,788 acres · 95% contained · updated Oct 14, 2026
Fires: NIFC/IRWIN via MTJP wildfire tracker · Oct 15, 2026
The agency doesn’t say how you get a siteIts record carries no access type, so treat it as a place to phone before you drive.
- Right now
- Listed not openA database flag with no reason and no date
5,600 ftElevation
28 ftWater · South Fork San Joaquin River
14.2 miSW of Mammoth Lakes, CA
56%Tree cover
Bortle 3Night sky · 367th darkest of 1,201 in CA
The place
the agency’s own description · what’s there
In the agency’s own words
Overflow camping area has one vault toilet.
Source: USFS Enterprise Data Warehouse · Aug 24, 2026
Facilities
- Toilets
- Vault Toilets
- “Overflow camping area has one vault toilet.”
Source: read from the agency description, shown above · Sep 12, 2026
Around the campground
- Fall color · reported 13 days ago, 24 km away
- Peak color
Source: More Than Just Parks foliage tracker, joined to this campground by distance (24 km) · Oct 4, 2026
Phone before you drive
recreation.gov publishes no availability for a campground you can’t reserve, so there’s no thirty-night reading to draw here. The season bar above is what the agency does publish.
Booking window6 months outBooking opens 6 months ahead; today unlocks arrivals through April 16, 2027. The agency publishes no reservable season in the record we hold, so the window may close earlier than that.recreation.gov
Runs itU.S. Forest Servicethe agency’s record
Every line of the receipt · 3
What you actually pay
The sign priceU.S. Forest Service
The U.S. Forest Service publishes no per-night rate for this campground that we can read, so there’s no sign price to print. That’s a gap in the record, not a free campground.
The booking feerecreation.gov
We hold no recreation.gov booking record for this campground, so we can’t say whether a booking fee applies.
What a stay costs
The agency publishes no nightly rate for this campground, so there’s no total to show.
How we know this receipt · 4
Booking fee, change fee, cancellation fee, no-show: Rules and Reservation Policies, Recreation.gov, the published fee schedule, curated by hand into lib/reservation-fee-schedule.json (9 rows, each carrying its own verbatim sentence). The publisher states these policies were last updated September 2019. · Sep 9, 2026
The two totals: Derived by CAMPANAC by adding the agency’s own published nightly rate to recreation.gov’s own published reservation fee. Both components are cited above; the addition is ours and is shown only where every component is known. · Sep 9, 2026
Who keeps the booking fee: Recreation.gov facility policy text, Dead Swede Campground (facility 234221) · Not on the national policy page. This is agency policy text recreation.gov publishes on individual campground pages; this site holds it verbatim on 45 active campgrounds (campground_rules.cancellation_description, scripts/load-facility-rules.mjs). · Sep 9, 2026
The contract: Reservation Gods: Who Stole Our Campsites and Sold Them Back to Us, More Than Just Parks, April 2025 · Apr 1, 2025
Source: USFS Enterprise Data Warehouse · Aug 24, 2026
record Aug 24, 2026 · How we know all this
Getting there
the map and the coordinate
Where it is
Also near hereSample Meadow CampgroundSierra National Forest · 5.1 mi
VermillionSierra National Forest · 6.6 miPortal Forebay CampgroundSierra National Forest · 6.8 miWest Kaiser CampgroundSierra National Forest · 7.3 miBolsillo CampgroundSierra National Forest · 7.9 mi
Mono CreekSierra National Forest · 8.1 mi
VermillionSierra National Forest · 6.6 miPortal Forebay CampgroundSierra National Forest · 6.8 miWest Kaiser CampgroundSierra National Forest · 7.3 miBolsillo CampgroundSierra National Forest · 7.9 miMono CreekSierra National Forest · 8.1 miSource: USFS Enterprise Data Warehouse · Aug 24, 2026
The weather
the next four days · the thirty-year normal
Next four days, and the thirty-year normal
Forecast
Overnight45°Clear
Saturday69°Sunny
Saturday Night43°Clear
Sunday67°Sunny
NWS forecast for Mammoth Lakes, CA
Source: National Weather Service, HNX forecast office · Oct 17, 2026
Typical weather
Typical October night 37°F, day 64°F.
Coldest month of the year: typical December night 26°F, below freezing. Bring a bag rated colder than that, and expect ice in the water bottle.
90°32°20°
Daily high and lowDays with 0.10 in or more
A normal is the 1991-2020 average for the month, not a forecast: about half of all Julys are colder than the July line. The seven-day forecast above answers the other question.
Measured at: SO ENTRANCE YOSEMITE NP, CA (USC00048380), 29 miles away and 553 ft lower
The land, and who answers for it
who answers for it
Who answers for this land
Onion Springs Overflow Camping Area is in California’s 5th congressional district. Its representative, Tom McClintock (R), votes on the laws that decide what happens to this land. Public-lands grade so far: F. See every public-lands vote →
How we know
every fact on this page, and where it came from
Right now: U.S. Forest Service’s own recreation database flags it not open and publishes no reason and no date. That’s a flag, not a notice.
Listed not open: USFS EDW Recreation Opportunities, openstatus field: a not-open flag in a database, with no reason and no date published; read there since Sep 9, 2026. A flag, not a notice, so this page doesn’t call it a closure. · Oct 16, 2026
Elevation: USGS 3DEP elevation point query at this campground’s coordinate · Sep 7, 2026
Tree cover: NLCD Tree Canopy Cover 2024 (USDA Forest Service / MRLC), one 30 m cell at this coordinate · Sep 9, 2026
Fall color: More Than Just Parks foliage tracker, joined to this campground by distance (24 km) · Oct 4, 2026
Reported by: iNaturalist fall color observations, reported peak color · Oct 4, 2026
Cell signal: the Forest Service’s own campground description, read as text by CAMPANAC. None of this is a measurement. It’s what the land manager published about the place, and phones, carriers and weather all disagree with each other; treat it as a warning, not a promise.