Best Time to Visit Yellowstone: What 55 Years of Weather Data Actually Shows
September is the best month for most visitors — 45% fewer crowds than July, elk bugling through the valleys, fall colors starting, and highs still in the 60s. Here's the month-by-month breakdown from actual NOAA station records.
September is the best time to visit Yellowstone for most people. Average highs hit 63°F, overnight lows drop to 30°F, and crowds thin out dramatically after Labor Day — roughly 45% fewer visitors than the July crush. Elk bugling season peaks mid-September, grizzlies are gorging before hibernation, and fall colors start appearing around September 15. All roads stay open through month's end.
But “best” depends on what you want. If you need guaranteed warm weather and every facility open, July is your month — just accept the million-person crowds. For baby wildlife, May is unmatched. For solitude and dramatic landscapes, October delivers if you can tolerate the weather gamble.
I looked at 55 years of NOAA weather station data from four stations around the park — West Yellowstone, Mammoth Hot Springs, Lake Yellowstone, and Old Faithful — plus NPS visitation records going back to the 1970s. Here's what actually shows up in the data for each month. You can also view our Yellowstone weather page for monthly averages and historical lookups.
Month-by-Month Yellowstone Weather & Visitor Guide
Temperature data from NOAA 1991-2020 climate normals for Yellowstone-area stations. Visitation levels based on NPS monthly data (2019-2024). Road status for the 2026 season.
| Month | Avg High | Avg Low | Crowds |
|---|---|---|---|
| January | 28°F | 1°F | Very Low |
| February | 32°F | 5°F | Very Low |
| March | 36°F | 11°F | Very Low |
| April | 46°F | 20°F | Low |
| May | 57°F | 29°F | Moderate |
| June | 66°F | 36°F | High |
| July | 76°F | 40°F | Extreme |
| August | 75°F | 38°F | Very High |
| September | 63°F | 30°F | Moderate |
| October | 49°F | 22°F | Low |
| November | 34°F | 12°F | Very Low |
| December | 27°F | 3°F | Very Low |
Temperature and precipitation: NOAA NCEI 1991-2020 normals. Crowd levels: NPS monthly visitation data 2019-2024.
January
Very Low crowdsRoads: Only North Entrance (Mammoth–Cooke City). Snowcoach/snowmobile access to Old Faithful.
Verdict: For winter adventurers only. Cold is extreme — single-digit lows are normal. But the solitude and wolf-watching are unbeatable.
February
Very Low crowdsRoads: Same as January. Snowcoach tours run through mid-March.
Verdict: Slightly warmer than January. Presidents' Day weekend brings a small bump in snowmobile traffic but nothing like summer.
March
Very Low crowdsRoads: North Entrance only. Winter season ends mid-March. Shoulder closure until April.
Verdict: Transition month. The park essentially closes to most visitors for 3-4 weeks between winter and spring seasons.
April
Low crowdsRoads: West Entrance and Mammoth–Old Faithful corridor open April 17 (2026). Other roads closed.
Verdict: Adventurous shoulder season. Roads are opening but conditions are unpredictable. Snow squalls one hour, sunshine the next. Few crowds.
May
Moderate crowdsRoads: Most roads open by May 8. Dunraven Pass and Beartooth Highway open May 22 (weather permitting).
Verdict: My pick for the best-kept-secret month. Crowds haven't arrived yet, baby animals are everywhere, and the rivers are full from snowmelt. Bring layers — morning lows in the 20s are normal.
June
High crowdsRoads: All roads open. All entrances operational.
Verdict: Everything is open, the weather is warm, and wildflowers cover the meadows. Early June has fewer crowds than late June. The tradeoff: afternoon thunderstorms are common.
July
Extreme crowdsRoads: All roads open.
Verdict: The warmest, driest month — and by far the most crowded. Nearly a million visitors in July 2024. Old Faithful boardwalks are packed by 10am. If you come in July, arrive at attractions before 7am.
August
Very High crowdsRoads: All roads open.
Verdict: Similar to July with slightly less insane crowds (868K visitors in 2024 vs. 992K in July). Late August sees families leave as school starts — the last week is noticeably quieter.
September
Moderate crowdsRoads: All roads open through at least September 30.
Verdict: The best month for most visitors. Crowds drop 40-50% from summer. Fall colors appear mid-month. Elk bugling echoes through the valleys. The one catch: first snow can hit by late September.
October
Low crowdsRoads: Roads begin closing mid-October. Most close first Monday of November.
Verdict: Golden aspens against snow-dusted peaks. Genuinely stunning if you catch good weather. But it's a gamble — some October days are 50°F and sunny, others bring 6 inches of snow.
November
Very Low crowdsRoads: Most roads close by early November. North Entrance stays open year-round.
Verdict: Transition to winter. Most of the park is inaccessible. Only worth it if you're specifically heading to Mammoth Hot Springs or Lamar Valley via the North Entrance.
December
Very Low crowdsRoads: North Entrance only until mid-December. Winter season (snowcoach/snowmobile) begins ~Dec 15.
Verdict: Winter wonderland if you're prepared. Snowcoach trips to Old Faithful start mid-December. Temperatures regularly drop below 0°F at night.
Which Month Is Best? It Depends on What You Want
There's no single “best month” because it depends entirely on your priorities. Here's how I'd rank it:
Best Overall
Perfect balance of weather (63°F highs), manageable crowds, elk bugling, fall colors, and all roads open. The only risk is early snow, but most September days are clear.
Best for Families
Warmest weather (66-76°F), all facilities open, predictable conditions. Avoid peak July if possible. Late August is ideal — families with school-age kids leave, crowds thin noticeably after August 20.
Best for Wildlife
May brings baby bison, bear cubs, and wolf pups — the park's nursery season. September has elk rut (bugling), grizzlies feeding aggressively, and wolves more active in cooler air.
Best for Solitude
Shoulder seasons. October has golden aspens and drama but unpredictable weather. Late April has opening-week energy and almost no crowds, but limited roads. Both require flexibility.
Best for Budget
Off-peak lodging prices, fewer people, but limited access. Gardiner and West Yellowstone hotels run 30-50% cheaper than July rates. Just know most park roads are closed.
Worst Overall
The park's dead zone. Winter season ends in mid-March. Spring roads don't open until mid-April. For 3-4 weeks, only the North Entrance is accessible and most facilities are closed.
2026 Yellowstone Road Opening Schedule
Yellowstone roads open in phases each spring, depending on snowpack and plowing progress. These are the 2026 dates — note that the April 17 opening was delayed from 8am to noon due to a late-season winter storm with heavy snow and strong winds.
Road dates are approximate and weather-dependent. Check NPS.gov road status before your trip.
Yellowstone Crowd Calendar: When to Avoid the Masses
Yellowstone received 4.7 million visitors in 2024, its second-busiest year ever. July alone drew 992,352 visitors — that's over 32,000 per day. Old Faithful parking lots fill by 9am on peak summer weekends.
The crowd sweet spots are clear in the data:
- •Late May (after Memorial Day weekend): Roads are mostly open, summer crowds haven't arrived. Baby animal season in full swing.
- •Early June (before summer break): Everything is open, wildflowers are blooming, and weekday visitation is 30-40% lower than late June.
- •After Labor Day (September): The single biggest crowd drop of the year. Families with school-age kids leave. The park feels different.
- •Last week of August: School starts in many states. Noticeably quieter than the first three weeks of August.
Dates to avoid: July 4th weekend is the single worst weekend of the year. Late July is the most crowded sustained period. Any Saturday in June-August will be significantly busier than a Tuesday or Wednesday.
Will El Niño Change Yellowstone's 2026 Weather?
El Niño is 85% likely to develop by late 2026, and it matters for Yellowstone trip planning. Here's what past El Niño events did to the Northern Rockies:
- •Warmer winter/spring: 2-4°F above normal. That means earlier snowmelt, earlier road openings (potentially), and warmer spring hiking conditions.
- •Drier than normal: The Northern Rockies typically see 15-20% less winter precipitation during El Niño. Lower snowpack could affect waterfall flows and river levels by July.
- •Higher wildfire risk: Reduced snowpack + warmer temps = earlier fire season. The park's fire management team watches El Niño patterns closely.
For summer visitors: the impact is modest. El Niño's influence fades during warm months. You might see slightly drier conditions and lower river flows, but day-to-day weather won't feel dramatically different. Our summer 2026 outlook has the full national picture.
Yellowstone Weather Records & Extremes
Yellowstone sits at 7,350 feet — higher than Denver — which means weather extremes that surprise people expecting a “summer vacation” destination.
Mammoth Hot Springs area. Rare — most July days peak in the mid-70s.
West Yellowstone station. One of the coldest non-Alaska readings in the Lower 48.
12+ feet of snow per year at higher elevations. Can snow any month.
Higher than Denver. UV intensity is fierce — sunscreen isn't optional.
The temperature swing in a single day can exceed 40°F. I've seen mornings at 25°F and afternoons at 68°F in September. Layers are non-negotiable. For temperature records by state, see our Wyoming records page and Montana records page.
Frequently Asked Questions
What is the best month to visit Yellowstone?
September is the best month to visit Yellowstone for most travelers. Crowds are 40-50% lower than the July peak, average high temperatures are a comfortable 63°F, elk bugling season is in full swing, and fall colors begin mid-month. All roads remain open through September. The only downside: first snow can arrive by late September, so pack layers.
What is the average temperature in Yellowstone in summer?
Summer temperatures in Yellowstone average highs of 66°F in June, 76°F in July (the warmest month), and 75°F in August based on NOAA 1991-2020 normals. Overnight lows drop to the mid-30s to low 40s even in summer — Yellowstone sits at 7,350 feet elevation, so mornings are cold year-round. Afternoon thunderstorms are common in June and early July.
Is September a good time to visit Yellowstone?
September is arguably the single best month to visit Yellowstone. Average highs reach 63°F with lows around 30°F. The summer crowds have cleared out — September sees roughly 45% fewer visitors than July. Elk rutting season peaks in mid-September with bulls bugling across Mammoth Hot Springs and the Madison River valley. Fall foliage begins around September 15-20. All park roads remain open. The main risk is early snow, but most September days are clear and crisp.
When do roads open in Yellowstone in 2026?
In 2026, Yellowstone roads open in phases: West Entrance and the Mammoth–Old Faithful corridor opened April 17 (delayed from 8am to noon due to a winter storm). Canyon to Fishing Bridge and the East Entrance open May 8. The South Entrance to Grant and West Thumb also opens May 8. Dunraven Pass and the Beartooth Highway are scheduled for May 22, weather permitting. Most roads close in early November, with the North Entrance (Mammoth to Cooke City) open year-round.
What is the worst time to visit Yellowstone?
The worst time to visit Yellowstone depends on what you want to avoid. For crowds: July 4th week and late July are the most packed, with nearly 1 million visitors in July 2024 alone — Old Faithful parking lots fill by 9am. For weather: March and early April are a dead zone when most of the park closes between winter and spring seasons. For cold: January averages a high of 28°F and a low of 1°F, with 34 inches of snow. That said, winter has incredible wolf-watching in Lamar Valley if you can handle the cold.
Data Sources & Methodology
Temperature and precipitation data from NOAA NCEI 1991-2020 US Climate Normals for Yellowstone-area stations (West Yellowstone, Mammoth Hot Springs, Lake Yellowstone, Old Faithful). Visitation data from the NPS Integrated Resource Management Applications (IRMA) portal. Road opening dates from NPS Yellowstone road status page. Our site's 139M+ historical weather observations used for gateway city climate context.
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