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What to Pack for Yellowstone in September & October
Yellowstone shoulder season can deliver golden aspens, bugling elk, empty boardwalks, and winter in the same week. At Yellowstone Lake and Old Faithful elevations near 2,400m / 7,800ft, fall packing is a safety system rather than an outfit plan.
Updated July 2026
Quick answer
For Yellowstone in September or October, pack for a 15–20°C / 27–36°F day-to-night swing and snow: a wicking base layer, fleece or light puffer, waterproof shell, warm hat, gloves, wool socks, and waterproof shoes for every family member. September averages about 18°C / 64°F by day and 1°C / 34°F at Yellowstone Lake; October falls to 11°C / 52°F and −2°C / 28°F. Carry bear spray and check roads daily.
At a glance
- 7-day vehicle entrance pass:
- $35; covers one private non-commercial vehicle
- Yellowstone Lake elevation:
- 2,372m / 7,782ft
- September at Yellowstone Lake:
- 18°C / 64°F high; 1°C / 34°F low
- October at Yellowstone Lake:
- 11°C / 52°F high; −2°C / 28°F low
- Fall road pinch point:
- Dunraven Pass scheduled to October 12, 2026; Beartooth typically mid-Oct
- Wildlife distance:
- 91m / 100yd bears and wolves; 23m / 25yd all other wildlife
Sample checklist preview
6 days · 2 adults · 2 childrenWhat the generator starts with for this trip type — you can edit everything in the next step.
- Jacket×1
- Coats×1
- Sweaters×1
- Gloves×1
- Dress Shirts×2
- Dresses×2
- T-shirts×3
- Pants×2
- Shorts×3
- Socks×6
- Underwear×6
- Sleepwear×2
The full generator adjusts these for weather, laundry, travelers, and destination.
What actually matters in Yellowstone in September and October
- •Build each child a 3-layer system: synthetic or merino base, fleece or light puffer, and waterproof shell. Yellowstone Lake sits at 2,372m / 7,782ft, where September averages 18°C / 64°F days but 1°C / 34°F nights.
- •Stage a spare-layer duffel in the car and keep gloves plus a neck buff in each jacket pocket: families may get out 15–20 times a day at pullouts and boardwalks, and September visitors report same-day swings of 25–28°C / 45–50°F.
- •Pack a warm hat and gloves for every person even in early September: Yellowstone can receive snow in any month, and October nights at Yellowstone Lake average −2°C / 28°F.
- •Carry bear spray on every trail and keep it accessible, not inside a backpack. Grizzly and black bears feed intensively through fall hyperphagia; NPS requires 91m / 100yd distance from bears and wolves.
- •Give September elk at least 23m / 25yd, especially during the rut around Mammoth Hot Springs and Grant Village; a bugling bull can charge people or cars that crowd it.
- •Download offline maps and fill the fuel tank before long loops: most campgrounds and lodges wind down from late September into early October, leaving fewer meals, toilets, and staffed desks.
- •Check NPS road status each morning. Dunraven Pass is scheduled through October 12 in 2026, Beartooth Highway usually closes around mid-October, and most park roads close to cars in early November.
- •Carry headlamps for the whole family: Yellowstone loses roughly 2 hours 45 minutes of daylight from September 1 to October 31, while wildlife drives often begin before sunrise.
- •Use waterproof boots with grippy soles around Old Faithful and Grand Prismatic: a 3.7in / 9.4cm average October snowfall can leave icy boardwalks even when the road is clear.
Typical weather by month
| Month | Avg high | Avg low | Rainy days |
|---|---|---|---|
| Jan | −4°C / 25°F | −16°C / 3°F | 13 |
| Feb | −3°C / 27°F | −17°C / 2°F | 12 |
| Mar | 2°C / 36°F | −12°C / 10°F | 12 |
| Apr | 6°C / 43°F | −7°C / 20°F | 11 |
| May | 11°C / 52°F | −2°C / 28°F | 12 |
| Jun | 17°C / 62°F | 2°C / 35°F | 11 |
| Jul | 22°C / 72°F | 4°C / 40°F | 8 |
| Aug | 22°C / 72°F | 4°C / 40°F | 7 |
| Sep | 18°C / 64°F | 1°C / 34°F | 7 |
| Oct | 11°C / 52°F | −2°C / 28°F | 8 |
| Nov | 1°C / 34°F | −9°C / 16°F | 12 |
| Dec | −4°C / 25°F | −14°C / 7°F | 14 |
Typical monthly averages for planning. Check a forecast closer to your trip.
Seasonal things to plan around
- Late Aug–early OctElk rut around Mammoth and Grant Village; stay 23m / 25yd away and never stand between a bull and cows.
- Sep–NovBlack and grizzly bears in hyperphagia; carry accessible bear spray and remain 91m / 100yd away.
- Sep–OctSnow and black ice can arrive at any time; Yellowstone Lake averages 1.5in snow in September and 6in in October.
- Late Sep–early OctMost campgrounds, lodges, and seasonal food counters close on staggered dates; confirm each overnight stop.
- Around mid-OctDunraven Pass and Beartooth Highway normally end their season around mid-month, weather permitting.
- Sep 1–Oct 31Daylight shrinks by about 2h 45m; carry a headlamp when a walk could extend beyond sunset.
Common Yellowstone fall packing mistakes
- •Treating a 20°C / 68°F September afternoon as the whole forecast; Yellowstone Lake nights average 1°C / 34°F and can fall below freezing.
- •Planning Dunraven Pass or Beartooth Highway after mid-October without a backup; snow can close either before its typical October window.
- •Leaving bear spray in the car: bears remain in fall hyperphagia, and the required bear distance is 91m / 100yd even at roadside sightings.
- •Approaching Mammoth elk for a photo during the September rut; NPS requires 23m / 25yd from elk, bison, and other large animals.
- •Assuming every summer meal stop remains open; many Yellowstone lodges, stores, and campgrounds close from late September through early October.
- •Starting a 4-hour hike at 3pm in October; sunset reaches roughly 6:15pm by mid-month, almost 2 hours earlier than in early September.
FAQ
Does it snow in Yellowstone in September?
Yes. Snow can fall in any month at Yellowstone elevations. Yellowstone Lake averages about 1.5in / 3.8cm in September, while a single fall storm elsewhere in the park can accumulate 12in / 30cm in 24 hours.
Is Yellowstone better in September or October?
September retains more roads, lodges, and campgrounds and averages 64°F / 34°F at Yellowstone Lake. October is quieter but averages 52°F / 28°F, brings more snow, and loses Dunraven Pass and Beartooth access around mid-month.
What roads close in Yellowstone in October?
Dunraven Pass is scheduled to close October 12 in 2026; Beartooth Highway typically closes around mid-October. Weather can move either date, and most interior roads close to regular vehicles in early November.
Are bears still active in Yellowstone in October?
Yes. Black and grizzly bears feed heavily during fall hyperphagia before denning. Carry bear spray on trails, hike in a group, make noise, and stay at least 100yd / 91m away.
What should kids wear in Yellowstone in September?
Use three removable layers: a moisture-wicking base, fleece or light puffer, and waterproof shell, plus a warm hat, gloves, wool socks, and waterproof shoes. A child may need all three at a 34°F dawn and one layer at a 64°F afternoon.
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