Having spent extensive time filming and exploring in Yellowstone, we can tell you the park rewards people who get up early and stay out late. The wildlife shows up on its own schedule. The geysers don’t care about your itinerary. And September in Yellowstone is a different animal than the summer crush that most folks know. The elk are bugling, the aspens are turning, and roughly 850,000 people still show up thinking they’ve found a secret. Here’s our planning guide.
I put together everything I know to help you plan the perfect Yellowstone in September trip. This is the month where the park starts to feel like it’s shifting gears, and you need to know exactly what that means for your visit.
Table Of Contents: Yellowstone in September
5 Quick Things to Know about Yellowstone National Park in September
- Entrance fees for Yellowstone National Park start at $20 per person (walking or biking in) and $35 per private vehicle. Reservations are not required, but buying your pass ahead of time will keep traffic moving. International folks 16 and older now pay an additional $100 non-resident surcharge per person (effective January 1, 2026). That fee is collected in person at the gate, not online. Yellowstone is one of 11 parks where the surcharge applies.
- It makes more sense to purchase an interagency park pass for $80, especially for those planning to also visit Grand Teton National Park. Since both parks charge $35 per vehicle, you’ll spend $70 anyway. Plus, the interagency pass gives you access to more than 2,000 public lands for a full year. One more thing for international folks. The $250 non-resident annual pass does NOT waive the $100 surcharge at the 11 affected parks.
- All roads remain open through September (weather permitting), but not all amenities are available monthlong. We’ll dive deeper into this in a little bit, but by no means should you assume September at Yellowstone runs on all cylinders. Campgrounds, lodges, and services start winding down on staggered schedules throughout the month.
- Yellowstone in September still gets crowds. Big ones. In September 2023, the park recorded 838,458 visits. That’s 97% of August’s total. The myth that kids going back to school empties the park is exactly that. Expect the heaviest traffic in the first two weeks, with things finally thinning toward the last week of the month.
- As important as it is to know the September weather in Yellowstone, it’s still part of wildfire season, too. I’m going to give you some tools to help check those conditions before and during your trip.
Early September vs. Late September
This is the single most important distinction for planning. Early September and late September at Yellowstone feel like two different parks.
Early September (September 1-14) still feels like summer in many ways. Daytime highs average 70-77 degrees F. Most campgrounds and lodges are still open. Crowds are heavy, especially on weekends and around Labor Day. The elk rut is just getting started, with bulls polishing antlers and testing their bugles. Foliage is green at lower elevations, with just the first hints of gold at the highest points.
Late September (September 15-30) is where the transformation happens. Highs drop to the 58-67 degree F range. Overnight lows regularly dip below freezing. The elk rut is in full swing. Aspens and cottonwoods are turning gold along the Gardner River corridor and at Mammoth Hot Springs. Several campgrounds have already closed. The last week of the month is when you’ll finally notice fewer cars at pullouts and shorter waits at Old Faithful. Snow at higher elevations becomes a real possibility.
If you want the most amenities and the warmest weather, aim for early September. If you want fall color, peak elk rut, and slightly thinner crowds, go late September and plan around the closures.
Access to Yellowstone in September
Depending on where you’re from, September might still seem like a month when everything can be open and available. In Yellowstone, some parts start closing down throughout the month. An early September visit to Yellowstone allows for more amenities. A late September visit means smaller(ish) crowds and better wildlife.
Let’s start by going through getting into Yellowstone National Park in September.
Yellowstone Entrances
All five entrances to Yellowstone National Park plan to be open throughout the month of September. The entrances are as follows.
- West/West Yellowstone
- South Entrance (To/From Grand Teton)
- East Entrance/Closest Town is Cody, WY
- Northeast Entrance/Cooke City
- North Entrance/Gardiner, MT
Yellowstone Airports: Pair your preferred entrance with the best airport nearby. We’ve put together this list of airports near Yellowstone for you.
The major caveat comes with the northeast entrance, as getting there from outside the park requires taking the Beartooth Highway. For those who tell you, “It’s so unlikely Beartooth will close in September,” let me set the record straight.
According to the notes from Yellowstone Park Rangers, Beartooth Highway was closed for part of or the entire month of September in 2017, 2014, and 2005. On the off chance this happens during your trip, you’re looking at a 3-4 hour detour through East Yellowstone or Gardiner.
2026 update on the northeast entrance. The Yellowstone River Bridge replacement project is wrapping up its final phase this year. The new bridge is more than twice as long as the old one at 1,285 feet and is already carrying traffic. But construction crews will still be working on overlooks and removing the old bridge through fall 2026, so expect some delays in that corridor.
Yellowstone Roads in September
All major park roads plan to stay open through September, including Dunraven Pass (Canyon Village to Tower Fall), which sits at one of the higher elevations and is the first road to close when winter weather arrives. In 2026, Dunraven Pass is scheduled to stay open through October 31. But “scheduled” and “actual” are two different things in Yellowstone. A heavy early snowstorm can temporarily shut down higher-elevation roads with little warning.
Text 82190 to 888-777 for mobile alerts on road closures. You can also call (307) 344-2117 for recorded conditions, updated multiple times daily during the operating season.
Yellowstone National Park Camping in September
Those looking for the bug-free bliss of camping at Yellowstone in September need to pay close attention to the dates. Campgrounds are one of the first things to start winding down this month. Here’s the 2026 September campground closure schedule.
- Bridge Bay closes September 14
- Indian Creek closes September 14
- Canyon closes September 20
- Grant Village closes September 27
- Tower Fall closes September 27
The campgrounds that stay open into October include Madison (closes October 18), Fishing Bridge RV Park (October 18), Lewis Lake (October 11), and Slough Creek (October 12). Mammoth is open year-round.
Pebble Creek Campground remains closed for the 2026 season entirely, still undergoing flood recovery from the 2022 damage. Norris Campground is also closed for 2026.
If you’re camping in late September, your best bet is Madison or Mammoth. Both keep you well-positioned for wildlife and geyser basins, and you won’t be scrambling to find a spot that’s still open.
Yellowstone Hotels and Lodging in September
If you’re just here to find Yellowstone National Park hotels/lodging, check out our review of Where to Stay in Yellowstone, with the pros and cons of each region.
Almost all lodges and hotels inside the park stay open through September and well into October. The one exception is Roosevelt Lodge Cabins, which closes on September 7, 2026. Every other property, from Old Faithful Inn to Lake Yellowstone Hotel to Canyon Lodge, remains open into at least early October.
In Wyoming and Montana, prepare to pay 11% – 12% resort, lodging, and sales taxes on top of the room price. For those staying mid-week at Yellowstone in September, a room outside the park isn’t a bad idea since traffic won’t be as bad as on weekends or holidays.
During those busy weekends and holidays, either plan to get up super early to beat the crowds (and watch the sunrise) or consider a room inside the park, preferably closest to the area you want to explore the most.
September Weather in Yellowstone National Park
I write with a bit of a smirk on my face that Yellowstone National Park averages a high of 62 degrees F in September and a low of 31 degrees F. What that really means is the high will be anywhere between 80 degrees F and 40 degrees F. Maybe even 90 and 30. What’s more? A high of 85 degrees F one day and a high of 44 degrees F the next isn’t an anomaly. That’s just September in Yellowstone.
Here’s the week-by-week breakdown so you can plan properly.
Early September (1st-10th) brings highs around 70-77 degrees F and lows around 37-44 degrees F. This is the warmest window. You can still get away with shorts during the day, though you’ll want layers for mornings and evenings.
Mid September (11th-20th) sees highs drop to the 65-72 degree F range, with lows around 33-40 degrees F. This is when overnight freezing starts becoming more common, especially at higher elevations.
Late September (21st-30th) averages highs of 58-68 degrees F and lows of 28-36 degrees F. Hard freezes happen at night. Morning ice on the windshield is normal. The cold, clear mornings also create the best conditions for seeing steam rise off the geysers and hot springs, which is genuinely one of the most photogenic things about visiting this time of year.
Those patterns grow more pronounced the higher in elevation you go. You’re already starting out a trip to Yellowstone National Park at about 6,200 feet (Mammoth) to 7,800 feet (most of the central park). About 4,000 more feet of elevation rise up on roads and trails not closed for early storms.
Yellowstone snow in September can be anywhere from one to eight or more inches, usually at higher elevations like Sylvan Pass. Here you can see snow in late September of 2021 made it all the way to the Grand Canyon of Yellowstone.
On average, less than 1.5 inches of snow can be expected in Yellowstone at Mammoth Hot Springs in September. Pack shorts and your winter coat, and love every blissful seasonal shift.
September Wildlife in Yellowstone
September might be the single best month for wildlife in Yellowstone. I know that’s a big claim for a park where you can see bison year-round. But hear me out. The elk rut is happening. Bears are in hyperphagia, eating 20,000 calories a day to prepare for winter. Wolves are more active. And the cooler temperatures keep animals moving during daylight hours instead of bedding down mid-morning like they do in July and August.
The Elk Rut
A unique aspect of late summer/early fall in Yellowstone National Park arrives with a loud, piercing cry of the bugling elk.
The rut picks up in the first week of September and peaks mid-to-late month. Bull elk round up harems of cows and defend them against rivals. The bugling is otherworldly. A high-pitched whistle that drops into a guttural grunt. You hear it before you see the animal, often in the predawn darkness.
Where to see it. Mammoth Hot Springs is ground zero for the elk rut. Bulls and their harems spread across the lawns, between buildings, and right along the road. It’s also one of the most dangerous situations in the park. Bull elk can and will charge people who get too close. The park recommends staying 25 yards away, minimum. Madison River between Madison Junction and West Yellowstone is the other prime spot, with elk spread across the meadows on both sides of the road at dawn and dusk.
Wolves in Lamar Valley
September is one of the best months for wolf watching in Lamar Valley. The cooler temperatures and active elk herds bring wolves out of the backcountry and into viewable range more frequently. Lamar Valley is wide open, well supplied with paved pullouts, and there’s a dedicated community of wolf watchers who are usually happy to share their spotting scopes.
Get there before sunrise. That’s not a suggestion. Be in position 45-60 minutes before first light. Look for clusters of cars and people with tripods, because they’ve already found something. A good spotting scope or binoculars in the 10×42 range will make or break your experience. With the naked eye, wolves are dots. With glass, they’re hunting, playing, and howling.
Plan to spend more than one morning if seeing wolves matters to you. There are days when they don’t show. Come back the next day and they might be roaming everywhere.
Bears and Other Wildlife
Both grizzly and black bears are in hyperphagia mode in September, eating everything they can find before winter. They wander down to lower elevations like Hayden and Lamar Valleys, looking for fattening food. Whitebark pine nuts, berries, ground squirrels. This makes them more visible from roads, but also more unpredictable.
Eagles and hawks start migrating around this time of year, so don’t forget to look up and see their soaring patterns above the mountain tops. Bison are everywhere, as always. And in September, you might catch the tail end of bison rutting season, with bulls still sparring in Hayden Valley.
Old Faithful and Geyser Basins in September
Old Faithful and the Upper Geyser Basin are fully accessible throughout September. Old Faithful erupts roughly every 90 minutes, give or take 10, and the visitor center posts predicted eruption times.
Here’s what changes in September. The crowds at Old Faithful thin out noticeably after mid-month, especially on weekday mornings. In July, you’re fighting for a spot on the benches. In late September, you can show up 10 minutes before an eruption and still get a front-row seat.
The best time to watch Old Faithful in September is early morning or late afternoon. The low-angle light turns the steam gold, and if temperatures have dropped overnight (they often have), the contrast between hot steam and cold air makes the eruptions look twice as dramatic. This is when you get those massive plume photos.
Grand Prismatic Spring is equally accessible, and the cooler air in September produces thicker steam columns that rise straight up in the still morning air. The Fairy Falls overlook trail gives you the classic aerial view.
Fishing in Yellowstone in September
The general fishing season in Yellowstone runs from the Saturday of Memorial Day weekend through October 31. September falls right in the sweet spot. The summer crowds on the rivers thin out, water temperatures cool, and the fish get aggressive.
September and October offer some of the best fly fishing of the year in Yellowstone, particularly for brown trout during the fall spawn. The Madison and Gardner rivers within the park’s boundaries are open for year-round fishing. The Firehole, Gibbon, and Yellowstone River (which opens July 1) are all available through the end of October.
Fishing hours are sunrise to sunset. You’ll need a Yellowstone fishing permit ($40 for a 3-day, $55 for a 7-day, $75 for a season pass in 2026). No state license is required to fish inside the park, but catch-and-release is mandatory for native cutthroat trout.
Fall Foliage at Yellowstone in September
The colorful signal of a seasonal change takes over different landscapes through Yellowstone in the fall. Fall color begins appearing at higher elevations in early September, with the whole park peaking somewhere between mid-September and early October depending on the year. An early frost speeds everything up. A warm, dry September can push peak color into the first week of October.
The Gardner River corridor and the rolling hills around Mammoth Hot Springs are filled with cottonwoods and aspens that blaze gold in September. Because Mammoth sits at a lower elevation (6,735 feet), the colors tend to linger here longer than in higher parts of the park.
Here are the best spots for fall color in Yellowstone, roughly ordered by when they peak.
- Dunraven Pass (8,859 ft) peaks first, often in mid-September. The aspens along the road between Canyon and Tower are some of the most photogenic in the park.
- West Thumb Geyser Basin (7,792 ft) offers a tranquil lakeside setting with aspens showing brilliant gold by mid-to-late September.
- Grand Canyon of the Yellowstone (7,800 ft) gets golden aspens framing the waterfalls by late September. The combination of yellow leaves, rust-colored canyon walls, and blue sky is hard to beat.
- Old Faithful and Geyser Basins (7,349 ft) are surrounded by aspen and cottonwood that turn late September into early October.
- Lamar Valley (6,400 ft) transforms with warm tones across meadows and forest edges, typically late September through mid-October.
- Mammoth Hot Springs (6,735 ft) is the last area to peak, often holding color into early October thanks to the lower elevation.
If you take nothing else away from this article, please heed this warning. Strongly reconsider a hike up Mount Washburn in September. Those hungry grizzlies are all over this mountain stocking up on food. At the bare minimum, speak to a ranger about bear activity and travel in as large (and noisy) of a group as possible. It’s frustrating because September is one of the few months of the year Washburn isn’t buried in snow.
What to Pack for Yellowstone in September
September in Yellowstone is a layering game. You might start the morning at 25 degrees F, be in a t-shirt by noon, and back in a jacket by 4pm. Here’s what actually works.
- Base layers for early morning wildlife watching (merino wool, not cotton)
- Insulating mid-layer like a fleece or lightweight down jacket
- Waterproof outer shell for surprise rain or snow
- Shorts and a t-shirt for those early September days that hit 75+ degrees F
- Warm hat and gloves for predawn wolf watching or geyser viewing
- Binoculars or spotting scope (10×42 binoculars are the standard for Lamar Valley)
- Bear spray if you’re hiking. September bears are focused on food and less predictable than summer bears.
- Windshield scraper. You’ll laugh until you need it at 6am in late September.
Final Thoughts about Yellowstone in September
I wouldn’t take one snowy or wet-footed step away from my memories of a September Yellowstone adventure. The unpredictability of the atmosphere makes it that much more wild. Even the few things I wasn’t 100% comfortable doing on my own came with a long list of tour options. The guides know the best places to find wildlife and can also pay much closer attention than you might to the weather and wildfire risk.
September in Yellowstone isn’t the shoulder season it used to be. The park recorded 838,458 visits in September 2023, which was 97% of August’s total and a 48% jump from September 2022. The secret is out. But here’s the thing. Even with those numbers, September still gives you something July and August can’t. The light changes. The air smells different. The elk are screaming. The first snow dusts the peaks. And if you time it right, late September rewards you with golden aspens, thinner crowds, and one of the most dynamic wildlife seasons in the Lower 48.
If you have more questions about Yellowstone in September, drop them in the comments below.
Map of September in Yellowstone
Pin Yellowstone in September
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