CAMPANAC.Powered by public lands intelligenceMore Than Just Parks
The map
U.S. Forest Service · Targhee National Forest · ID

Flatrock Campground

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.
Get directionsWhat it costs, and the rules
Right now
OpenInside the published season, our reading; a database flag says not open
Season
May 1Opens May 1. No closing date published.
Photos · U.S. Forest Service
6,430 ftElevation
953 ftWater · Henrys Fork
15.4 miSW of West Yellowstone, MT
25%Tree cover
Bortle 3Night sky · 429th darkest of 523 in ID
Opens May 1. No closing date published.Today

The place

the agency’s own description · what’s there

In the agency’s own words

Flatrock Campground is located 22 miles south of West Yellowstone, Montana off of Highway 20. The campground is adjacent to the Henry's Fork of the Snake River.

Source: USFS Enterprise Data Warehouse · Aug 24, 2026

Around the campground

On the water
River
Source: Stated in the agency description

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
Directions
Every line of the receipt · 4

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 this campground addsits own record
Extra vehicleSee the note

“Single Site $ 25.00 Single Site (electric) $ 31.00 Double Site (electric) $ 62.00 Extra Vehicle (ea.) $ 7.00” · the U.S. Forest Service’s own fee record

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 · 5
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
What this campground adds: The U.S. Forest Service’s own fee record and notices for this campground, quoted verbatim. An extra-vehicle charge is set locally and appears on no national schedule, so it’s never assumed. · Aug 24, 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

Seen something wrong here? Tell us.

Getting there

the map and the coordinate
Coordinate44.49694, -111.34000

Where it is

Source: 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

This Afternoon54°Sunny
Tonight28°Partly Cloudy
Saturday53°Mostly Sunny
Saturday Night28°Partly Cloudy

NWS forecast for Island Park, ID

Source: National Weather Service, PIH forecast office · Oct 16, 2026

Typical weather

Typical May night 29°F, day 55°F.

Coldest night of the open season: typical May night 29°F, below freezing. Bring a bag rated colder than that, and expect ice in the water bottle.

80°32°-10°

Daily high and lowDays with 0.10 in or moreOutside the published season

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: OLD FAITHFUL, WY (USC00486845), 25 miles away and 921 ft higher
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020, monthly normals · Sep 8, 2026

The land, and who answers for it

what threatens it · who answers for it

What threatens this place

developing
Roadless
Two Top6,990 acres · 8 mi · inventoried roadless area
Roadless
Mt. Jefferson4,482 acres · 10 mi · inventoried roadless area

You’re camping on ground somebody wants. We track the threats and the comment deadlines.

Source: MTJP Threatened Lands map · Sep 30, 2026

Who answers for this land

Mike Simpson, official portrait

Flatrock Campground is in Idaho’s 2nd congressional district. Its representative, Mike Simpson (R), votes on the laws that decide what happens to this land. Public-lands grade so far: F. See every public-lands vote →

Seen something wrong here? Tell us.

Source: U.S. Census district boundaries and the MTJP Congressional Public Lands Score

How we know

every fact on this page, and where it came from
Right now: Today falls inside the season the agency publishes, and it has posted nothing else. That reading is ours. The U.S. Forest Service’s own database, though, flags it not open with no reason or date; the flag is named under How we know all this.
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
Season: USFS Enterprise Data Warehouse · Aug 24, 2026
Elevation: USGS 3DEP elevation point query at this campground’s coordinate · Sep 7, 2026
Night sky: VIIRS Day/Night Band annual cloud-free composite, VNL V2 2024 (Earth Observation Group, Colorado School of Mines), read at the published coordinate: 0.1 mcd/m² of artificial all-sky glow, ranked against the 523 rated federal campgrounds in Idaho · Sep 8, 2026
Sky-glow model: Duriscoe, Anderson, Luginbuhl and Baugh (2018), a simplified model of all-sky artificial sky glow derived from VIIRS Day/Night band data, the National Park Service sky-glow model
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.
Nearest place of any size: inside Island Park, ID. Straight line.
Nearest town: U.S. Census Bureau TIGER/Line 2024 places, measured by CAMPANAC to the town boundary; population is the ACS 2020-2024 5-year estimate · Sep 9, 2026