Campsite Sniper
Wyoming · Recreation.gov

Headwaters Campground at Flagg Ranch

44.1052° N / 110.6677° W · Data Sep 18 2026, checked hourly
Next open date Sep 18Next open weekend Sep 1874 detected openings this week165 monitored sites

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Every site at Headwaters Campground at Flagg Ranch, colored by availability across the tracked window. Tap a site for its calendar.
Headwaters Campground at Flagg Ranch

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Booking reality
Campsite Sniper detected 74 site openings here in the last 7 days
Set a free alert →
01 · Detected Opening History · the openings record · file CS-258832

When Headwaters Campground at Flagg Ranch reopens

Headwaters Campground at Flagg Ranch's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 7 days
74
Openings · last 30 days
146
Openings · last 90 days
155

Weekday pattern

Detected openings by day of week · 90d
01020304020153532131624MONTUEWEDTHUFRISATSUNOPENINGS RECORDED · LAST 90 DAYS · N = 155

No strong weekday pattern is evident in the openings Campsite Sniper has detected: 155 openings spread across the week.

Hour-of-day pattern

First detected by hour · local time · last 90 days
0481216201017131512141111000408121620HOUR OF DAY (24H) · MT · LAST 90 DAYS

The largest concentrations of detected openings were first detected during the 11:00 and 14:00 local-time hours. Those hours contained 32 of 155 detected openings (20.6%). Hours show when Campsite Sniper first detected each opening, in Mountain Time, not when the change was made upstream.

Lead-time profile

Days before stay date · percentiles
P25 · 5DMEDIAN · 14 DAYS OUTP75 · 24D0306090120150180DAYS BEFORE STAY DATE

Half of the openings Campsite Sniper detected appeared at least 14 days before the stay date; the middle 50% land 5–24 days out. Set an alert if you want Campsite Sniper to monitor future openings.

Highest-churn sites

Most openings · 90d
SiteOpeningsShare of all openings
324  85.2%
506  74.5%
523  74.5%
325  63.9%
708  63.9%

Site 324 had the most detected openings in the last 90 days: 8. One free watch covers every site here.

02 · Availability Outlook · Sep 18 – Oct 3, 2026 · of 165 monitored sites

Of the 2,640 tracked site-nights (Sep 18 – Oct 3, 2026): 252 open for online reservation · 1,156 reserved · 1,232 closed.

Where the open windows are

90.5% of tracked site-nights are not currently open for online reservation. 252 of 2,640 remain open; here is where they are.

Load status

Sep 18 – Oct 3, 2026
Not open online90.5%
Open site-nights252 / 2,640
Reserved (of online inventory)1,156 / 1,408
Weekday openings117
Weekend openings135

Of the open site-nights on mapped sites, 117 fall on weekdays and 135 on weekends (Fri–Sun).

Open dates by month

Sep 2026 – Oct 2026
05001,0001,5002,0002,500126126SEPOCTSOLID = OPEN SITE-NIGHTS · DASHED OUTLINE = TOTAL BOOKABLE

September holds the most room. 126 of 2,145 site-nights are still open there.

Holiday windows

Sites open per night · of 165 sites
WindowNightSites openStatus
Labor DaySAT Sep 50None open
SUN Sep 60None open
MON Sep 70None open

Labor Day: no online availability on any tracked night.

Best-availability sites

Most open site-nights · tracked window
SiteOpen site-nights
301  10
325  10
702  10
705  10
703  9

The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.

Next windows

As of Sep 18, 2026 snapshot
Next open dateFri · Sep 18
Next open weekendFri · Sep 18

The next bookable night is Sep 18; the first open weekend starts Sep 18. Campsite Sniper can watch later dates for you.

Stays and site detail

252 open site-nights across 77 sites at Headwaters Campground at Flagg Ranch, from the same hourly snapshot as everything above.

Multi-night stays. 60 2-night, 34 3-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 19 at site 705.

RV length. Longest recorded site here is 45 ft. 108 sites take 25 ft, 79 sites take 35 ft, 53 sites take 40 ft. 26 sites of 165 have no recorded maximum and are not counted.

Showing 60 of 77 sites with current availability
SiteMax RVHookupsOpen site-nightsLongest runDates
30113 ftNone105 nightsSep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 2, Oct 3
32512 ftNone105 nightsSep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 2, Oct 3
702Not recordedNone106 nightsSep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 29, Oct 1, Oct 2, Oct 3
705Not recordedNone105 nightsSep 19, Sep 20, Sep 21, Sep 22, Sep 26, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3
703Not recordedNone95 nightsSep 23, Sep 24, Sep 25, Sep 26, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3
701Not recordedNone84 nightsSep 24, Sep 25, Sep 26, Sep 28, Sep 30, Oct 1, Oct 2, Oct 3
706Not recordedNone74 nightsSep 19, Sep 20, Sep 25, Sep 30, Oct 1, Oct 2, Oct 3
10835 ftNone65 nightsSep 21, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3
708Not recordedNone65 nightsSep 25, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3
70918 ftNone65 nightsSep 25, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3
32415 ftNone52 nightsSep 25, Sep 28, Sep 29, Oct 2, Oct 3
50745 ftYes55 nightsSep 29, Sep 30, Oct 1, Oct 2, Oct 3
509Not recordedNone53 nightsSep 24, Sep 25, Sep 26, Oct 2, Oct 3
52245 ftYes53 nightsSep 18, Sep 29, Oct 1, Oct 2, Oct 3
527Not recordedNone53 nightsSep 23, Sep 24, Oct 1, Oct 2, Oct 3
710Not recordedNone55 nightsSep 21, Sep 22, Sep 23, Sep 24, Sep 25
10427 ftNone44 nightsSep 29, Sep 30, Oct 1, Oct 2
10635 ftNone44 nightsSep 28, Sep 29, Sep 30, Oct 1
11025 ftNone44 nightsSep 30, Oct 1, Oct 2, Oct 3
30222 ftNone44 nightsSep 21, Sep 22, Sep 23, Sep 24
31345 ftYes44 nightsSep 30, Oct 1, Oct 2, Oct 3
50645 ftYes44 nightsSep 30, Oct 1, Oct 2, Oct 3
51045 ftYes44 nightsSep 30, Oct 1, Oct 2, Oct 3
51145 ftYes43 nightsSep 22, Sep 23, Sep 24, Oct 3
52345 ftYes42 nightsSep 22, Sep 23, Sep 26, Oct 3
10335 ftNone32 nightsSep 29, Oct 2, Oct 3
10930 ftNone32 nightsSep 24, Oct 2, Oct 3
11127 ftNone32 nightsSep 27, Sep 29, Sep 30
30345 ftYes32 nightsSep 30, Oct 2, Oct 3
30835 ftYes33 nightsOct 1, Oct 2, Oct 3
31025 ftYes33 nightsOct 1, Oct 2, Oct 3
31815 ftNone31 nightSep 26, Sep 28, Oct 3
51245 ftYes32 nightsSep 18, Oct 2, Oct 3
51845 ftYes31 nightSep 19, Sep 29, Oct 3
51945 ftYes32 nightsSep 29, Oct 2, Oct 3
521Not recordedNone32 nightsSep 25, Oct 2, Oct 3
52545 ftYes33 nightsOct 1, Oct 2, Oct 3
52935 ftYes33 nightsOct 1, Oct 2, Oct 3
53116 ftNone32 nightsSep 24, Sep 29, Sep 30
704Not recordedNone33 nightsOct 1, Oct 2, Oct 3
707Not recordedNone32 nightsSep 23, Sep 24, Oct 3
71218 ftNone31 nightSep 23, Oct 1, Oct 3
10230 ftNone21 nightSep 21, Oct 1
30445 ftYes21 nightSep 30, Oct 3
30945 ftYes21 nightSep 25, Oct 3
31135 ftYes22 nightsOct 2, Oct 3
31235 ftYes22 nightsOct 2, Oct 3
31725 ftYes22 nightsSep 19, Sep 20
32125 ftYes21 nightSep 25, Sep 30
32225 ftYes21 nightSep 20, Oct 3
32335 ftYes21 nightSep 21, Oct 3
32845 ftYes22 nightsOct 2, Oct 3
50345 ftYes21 nightSep 30, Oct 3
50445 ftYes21 nightSep 30, Oct 3
514Not recordedNone22 nightsOct 2, Oct 3
51645 ftYes22 nightsOct 2, Oct 3
51745 ftYes22 nightsOct 2, Oct 3
520Not recordedNone22 nightsOct 2, Oct 3
52435 ftYes22 nightsOct 2, Oct 3
53025 ftYes21 nightSep 20, Sep 30

About Headwaters Campground at Flagg Ranch

Overview

Availability will go live on Recreation.gov on a 6-month rolling basis for RV sites, Tent sites, and Camper Cabins.

Located in the John D. Rockefeller, Jr. Memorial Parkway, directly between Grand Teton and Yellowstone National Parks and just minutes from both, Headwaters Campground offers the perfect basecamp for exploration. Situated in a spectacular wooded setting with rolling hills and Teton mountain views, this campground is the perfect place to unwind and unplug, as there is limited cellular or internet service. Commune with nature and spot bear, moose, mule deer, and more as you stroll along nearby Polecat Creek. For avid anglers, the Snake River offers plentiful cutthroat trout, brook trout, and whitefish. While none of Headwater’s campsites are on the river, all are within walking distance.

The campground offers 34 tent sites, 97 full-hookup and pull-through RV sites, and 40 Camper Cabins, and is open from June to October. Visitors are encouraged to plan ahead and book early.

Recreation

The Headwaters area is a prime location for wildlife watching and photography. Walk along the banks of Polecat Creek through wildflower meadows and conifer forests to capture that perfect photo of a beaver, moose, elk, bison, bear, or birds. (Be sure to maintain appropriate distance!) Although soaking is not permitted, Huckleberry Hot Springs is an easy 2.5-mile loop that starts at Polecat Creek.

The Flagg Canyon trail is a good option for all ability levels. This 5.1-mile out and back hike winds through meadows and cliffs along the Snake River, and features a waterfall. There is plenty of wildlife to see in this area, including marmot, elk, and white-throated swift.

Facilities

Headwaters campground offers camping for tents, full-hookup camping for RVs, and hard-wall Camper Cabins. Each tent site has a gravel parking space for up to two vehicles, and tent pads for up to two tents. All RV sites are pull-through with gravel parking space for one RV and one tow vehicle with a maximum total length of 45 feet. Our RV sites offer full-hookups including sewer, water, and 20-, 30-, and 50-amp electric outlets. Propane is available for purchase at the campground office.

Headwaters Camper Cabins are scattered throughout the campground and include double-double or double-single bunk-style beds. While the bunks are padded, bedding and pillows not included. Guests are encouraged to bring their own linens, however a limited quantity of sleeping bags, pillows and blankets are available on a first-come basis for a nightly fee. Our Camper Cabins do not offer electricity or private restrooms, but do include a lantern.

All sites, including Camper Cabins, have a picnic table, a fire pit with metal fire grate, access to nearby water spigots, flush toilets, shower facilities, and coin-operated laundry facilities. Tent and RV sites also include food storage lockers. A phone is available in the lodge lobby for public use 24 hours per day.

ADA Access: The campsites and roads are well-compacted gravel and mostly level, with a gently sloping incline/decline that may make wheelchair access more challenging. Restroom facilities are wheelchair-accessible with one fully accessible shower. Routes to the amphitheater have a gently sloping incline/decline with compacted gravel, and are somewhat uneven.

Firewood, food, and ice can be purchased at the convenience store, and camping supplies, souvenirs, and more are available in the gift shop, both located in the main lodge. The main lodge also offers casual dining for breakfast, lunch, and dinner at Sheffields Restaurant and Saloon.

Natural Features

Headwaters at Flagg Ranch is situated in a tranquil setting along the upper reaches of the Snake River, surrounded by meadows and conifer forests. The Yellowstone Plateau rises to the north, and Huckleberry Mountain to the east.

Within walking distance is Polecat Creek, which runs through forests, wildflower meadows, and thermal features. For avid anglers, the Snake River offers plentiful cutthroat trout, brook trout, and whitefish. This area is known for its remarkable fly fishing and photography opportunities.

Headwaters is home to elk, moose, mule deer, wolves, black and grizzly bears, a wide variety of birds and more. Bears are often seen on trails and in the developed areas. Being prepared for an animal encounter can help ensure your safety as well as that of the wildlife that call this spectacular area home.

Nearby Attractions

One of the many reasons visitors return to Headwaters at Flagg Ranch year after year is its close proximity to Yellowstone’s south entrance, just a few miles north. But while it wouldn’t be difficult to spend all your time exploring our country’s very first national park (and the second-largest in the lower 48 states), there is much to see and do in the opposite direction as well. Take a self-guided tour of Grand Teton National Park via the 43-mile Scenic Loop Drive, offering an opportunity to photograph the park’s famous landscape and local wildlife. Spend a few hours at Colter Bay Village, located about 30 minutes south of Headwaters Campground, where you can rent a kayak or canoe, take a guided boat ride to the majestic base of the Teton Range, or just enjoy lunch and the stunning lake view from the marina. Continue on and stop in at the historic Jackson Lake Lodge for its famous huckleberry milkshakes and spectacular Teton views through 60-foot tall wall-to-wall windows. While you’re there, book a scenic raft trip or park bus tour. From there, continue south to the town of Jackson, located about 50 miles from Headwaters, where you can visit the National Museum of Wildlife Art just outside of town, walk under the famous giant elk antler archway in town center, attend the Jackson Hole Rodeo, browse local shops, and dine at one of the many restaurants.

165 monitored sitesRVs up to 45 ft94 with hookups153 shadedPets OKFire pitsMax party 10

Getting there

The address for Headwaters at Flagg Ranch is located below; however, due to this property's remote location, GPS cannot always be relied on. 100 Grassy Lake Rd. Moran, WY 83013 (Two miles south of the south gate of Yellowstone) From Yellowstone: Follow the signage to the South gate of Yellowstone - about 40 miles from Old Faithful. After exiting the south gate, Headwaters at Flagg Ranch will be just 2 miles South on the right side of the road. From Jackson, WY: Head North from Jackson on US 191/89. Turn left to continue on US 191/89 at the Moran Junction and enter the Grand Teton National Park through the Moran entrance. Continue straight through the Jackson Lake junction for another 21 miles. Headwaters at Flagg Ranch will be located on the left side of the road. As you pull into the property, the lodge will be located on your right and the campground will be on the left. Please note Grassy Lake Road is a dirt and gravel road that leads to Ashton, Idaho. Four-wheel drive is strongly encouraged on this narrow single-lane road. It is not recommended for trailer traffic or large vehicles.

1 Grassy Lake Road, Moran, WY 83013307-543-2861
AmphitheaterBirdingCampingFishingHikingHorseback RidingHotel/Lodge/Resort Fs OwnedInterpretive ProgramsPhotographyScenic DriveStar GazingVisitor CenterWildernessWildlife Viewing

View on Recreation.gov ↗   Get directions ↗

FAQ

How do I get a reservation at Headwaters Campground at Flagg Ranch?

Reservations for Headwaters Campground at Flagg Ranch are made through Recreation.gov. 90.5% of tracked site-nights are not currently open for online reservation; 252 of 2,640 remain open. Campsite Sniper has also detected 155 site openings here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.

Does Campsite Sniper book this campground for me?

No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.

How current is this availability data?

Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 16:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.

How often do new openings appear at Headwaters Campground at Flagg Ranch?

Campsite Sniper detected 74 site-date openings at Headwaters Campground at Flagg Ranch in the last 7 days, 146 over 30 days and 155 over the last 90.

Can I get a multi-night stay at Headwaters Campground at Flagg Ranch?

34 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Sep 19 at site 705. Confirm and book on Recreation.gov.

Which sites at Headwaters Campground at Flagg Ranch fit a 35-foot RV?

79 of the 165 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 45 ft. 139 of those 165 sites have a recorded maximum length and 26 do not; they are not counted as fitting.

Which month has the most availability at Headwaters Campground at Flagg Ranch?

September 2026, with 126 open site-nights in the current snapshot of 2,145.

How far ahead of a stay do openings appear at Headwaters Campground at Flagg Ranch?

Half of the openings Campsite Sniper detected appeared at least 14 days before the stay date; the middle 50% landed 5-24 days out. Campsite Sniper can monitor future changes for dates you select.

When is the next open date at Headwaters Campground at Flagg Ranch?

As of the Sep 18, 2026 snapshot: the next open date is Fri, Sep 18 and the next open weekend starts Fri, Sep 18. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.

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