Yellowstone National Park experiences dramatic weather changes throughout the year. Because much of the park sits at elevations of 6,000 feet (1,829 meters) or higher, visitors can encounter sunshine, rain, snow, and large temperature swings—even during summer.
So, when is the best time to visit Yellowstone National Park?
For most travelers, late June through September offers the best combination of accessible roads, open facilities, pleasant daytime temperatures, hiking opportunities, and wildlife viewing. July and August are the warmest months, while September brings cooler temperatures, fall colors, and generally fewer crowds.
Yellowstone National Park Weather at a Glance
Yellowstone’s weather varies significantly depending on elevation and location. Summer days can be pleasantly warm, but nights can become cold, particularly at higher elevations. Spring and fall can bring snow, while winter is extremely cold and snowy.
| Season | Typical Weather | Best For |
|---|---|---|
| Spring | Cool, wet, possible snow | Wildlife, waterfalls, fewer crowds |
| Summer | Warm days, cool nights, thunderstorms | Hiking, sightseeing, road trips |
| Fall | Cool days, cold nights, possible snow | Wildlife, fall colors, fewer crowds |
| Winter | Very cold, snowy | Snow activities, wildlife, winter scenery |
Best Time to Visit Yellowstone for Good Weather
Late June to September
For a first Yellowstone trip, late June through September is generally the easiest period for exploring the park.
By late June, most roads and facilities are open, although weather can still be variable at higher elevations. July is the warmest month, while August remains warm and offers excellent conditions for hiking and sightseeing. September is cooler but can be especially appealing if you want fewer visitors and early fall scenery.
However, summer is also Yellowstone’s busiest period. The National Park Service recommends arriving at park entrances before 7 a.m. or after noon and avoiding major attractions during the busiest 10 a.m. to 4 p.m. period.
July: Warmest Weather
July is Yellowstone’s warmest month. At Mammoth Hot Springs, the average high is around 83°F (28°C), while Yellowstone Lake averages about 74°F (23°C) for daytime highs.
July is excellent for:
- Hiking and backpacking
- Scenic drives
- Wildlife watching
- Fishing
- Boating
- Guided tours
- Camping
The main disadvantage is that July is extremely busy, and afternoon thunderstorms are common.
August: Warm and Excellent for Sightseeing
August remains one of the best months for a Yellowstone road trip. Average highs are close to July levels, and snowfall is normally absent in the monthly averages shown by the National Park Service.
Expect:
- Warm afternoons
- Cool mornings and evenings
- Occasional thunderstorms
- Busy roads and attractions
- Excellent hiking conditions
If you visit in August, start sightseeing early in the morning to avoid the biggest crowds.
September: Best Balance of Weather and Crowds
September is one of the best months to visit Yellowstone if you want a balance between comfortable weather and fewer visitors.
Average September temperatures listed by the National Park Service are about 68°F (20°C) for highs and 37°F (3°C) for lows. Snow is possible, particularly later in the month and at higher elevations.
September is a great choice for:
- Wildlife watching
- Hiking
- Scenic drives
- Photography
- Early fall colors
- Cooler temperatures
- A quieter park experience
Yellowstone Weather by Season
Spring Weather: April to May
Spring in Yellowstone can be unpredictable. Lower elevations begin warming, but snow can remain at higher elevations.
May has average highs of about 60°F (16°C) at Mammoth Hot Springs and 52°F (11°C) around Yellowstone Lake. Snowfall is still possible, especially around the lake and other high-elevation areas.
Spring is particularly attractive for wildlife lovers. Visitors may see bison and other animals with young, along with wildflowers appearing as the landscape begins to green.
Best for: Wildlife viewing, waterfalls, fewer crowds and spring scenery.
Keep in mind: Road openings and weather conditions can vary, so check current park conditions before traveling.
Summer Weather: June to August
Summer provides the most convenient conditions for a traditional Yellowstone vacation.
Daytime temperatures are often around 70°F (21°C) and can occasionally reach 80°F (27°C) at lower elevations. Even during summer, higher elevations can experience freezing temperatures at night. Afternoon thunderstorms are also common.
June is still somewhat transitional. Snow can remain at high elevations, but most areas become accessible as the month progresses. July is typically the warmest month, while August continues to offer warm sightseeing conditions.
Best for: Hiking, camping, sightseeing, wildlife viewing, fishing and road trips.
Fall Weather: September to October
Fall brings cooler temperatures and changing scenery to Yellowstone.
September can still be comfortable during the day, while October becomes noticeably colder. The National Park Service reports an average October high of about 56°F (13°C) and an average low of 29°F (-1°C). Snowfall also increases during October.
Fall is an excellent time for photographers and wildlife enthusiasts. However, weather can change quickly, and some facilities and roads may have seasonal operating schedules.
Best for: Wildlife, photography, fall scenery and fewer crowds.
Winter Weather: November to March
Yellowstone winters are cold, snowy and dramatically different from summer.
Winter daytime temperatures commonly range from 0°F to 20°F (-18°C to -7°C), with sub-zero temperatures possible at night and at higher elevations. Yellowstone receives an average of around 150 inches (381 cm) of snow per year, with some higher elevations receiving twice that amount.
Winter visitors can enjoy:
- Snowshoeing
- Cross-country skiing
- Snowmobiling
- Snowcoach tours
- Winter wildlife viewing
- Snow-covered geysers and hot springs
- Dramatic winter photography
Winter travel requires considerably more planning. Most park roads are closed to regular vehicles during winter, with limited snowmobile and snowcoach access on certain routes. The road between Mammoth Hot Springs and the Northeast Entrance is generally the only park road open to regular traffic year-round, weather permitting.
Yellowstone National Park Monthly Weather
The following figures are based on National Park Service climate averages and provide a useful general guide. Actual conditions can vary considerably by elevation and location.
| Month | Avg. High | Avg. Low | Avg. Snowfall |
|---|---|---|---|
| January | 29°F (-2°C) | 10°F (-12°C) | 14.5 in |
| February | 34°F (1°C) | 13°F (-11°C) | 10.4 in |
| March | 40°F (4°C) | 17°F (-8°C) | 13.1 in |
| April | 49°F (10°C) | 26°F (-3°C) | 5.9 in |
| May | 60°F (16°C) | 34°F (1°C) | 1.5 in |
| June | 70°F (21°C) | 41°F (5°C) | 0.1 in |
| July | 80°F (26°C) | 47°F (8°C) | 0 in |
| August | 78°F (26°C) | 45°F (7°C) | 0 in |
| September | 68°F (20°C) | 37°F (3°C) | 0.5 in |
| October | 56°F (13°C) | 29°F (-1°C) | 3.7 in |
| November | 39°F (4°C) | 19°F (-7°C) | 9.0 in |
| December | 31°F (-1°C) | 12°F (-11°C) | 13.5 in |
Source: National Park Service monthly climate averages.
What Is the Best Month to Visit Yellowstone?
The best month depends on what you want to do.
Best Overall: September
September offers a strong combination of mild daytime temperatures, wildlife activity, beautiful scenery and fewer visitors than the peak summer months.
Best for Warm Weather: July
July is the warmest month and provides excellent conditions for hiking, camping, sightseeing and other outdoor activities. It is also one of the busiest months.
Best for Hiking: July and August
If your main goal is hiking, July and August generally provide the most reliable summer conditions, although thunderstorms and cool nights are still possible.
Best for Wildlife: Spring and Fall
Spring and fall can be excellent for wildlife watching. Yellowstone’s seasonal wildlife activity includes bison, elk, bears, wolves and other animals, depending on the time and location.
Best for Snow: December to February
For a true winter experience, December through February offers snowy landscapes, frozen scenery and opportunities for snow-based activities.
Does It Snow in Yellowstone in Summer?
Yes. Snow is possible even during summer, particularly at higher elevations.
Yellowstone’s high elevation means that weather can be very different from what travelers expect from a typical summer destination. The National Park Service notes that snow can occur during any month, while summer nights can fall below freezing at higher elevations.
That’s why packing layers is important even if your Yellowstone trip is scheduled for July or August.
What to Pack for Yellowstone Weather
Regardless of when you visit, prepare for changing conditions.
Summer Packing List
- Lightweight layers
- Warm jacket or fleece
- Rain jacket
- Comfortable hiking shoes
- Sun protection
- Hat and sunglasses
- Reusable water bottle
- Insect protection
Spring and Fall Packing List
- Insulated jacket
- Waterproof outer layer
- Warm layers
- Gloves
- Hat
- Waterproof hiking shoes
- Extra socks
Winter Packing List
- Insulated winter coat
- Thermal base layers
- Warm gloves
- Winter hat
- Insulated boots
- Warm socks
- Snow-ready clothing
- Hand and foot warmers
The National Park Service recommends bringing a warm jacket, rain gear and plenty of layers regardless of the season.
Tips for Dealing With Yellowstone Weather
1. Check the Forecast Before Leaving
Yellowstone weather can change quickly, so check current conditions and forecasts before heading out each day.
2. Dress in Layers
Layering makes it much easier to adjust to changing temperatures throughout the day.
3. Start Early in Summer
Summer mornings are generally cooler and can help you avoid the heaviest crowds around popular attractions.
4. Prepare for Afternoon Storms
Summer thunderstorms are common, so carry rain protection when hiking or sightseeing.
5. Don’t Assume One Area Has the Same Weather
Yellowstone covers a huge area with significant elevation differences. Weather around Yellowstone Lake can be considerably colder than conditions at lower-elevation locations such as Mammoth Hot Springs.
Final Verdict: When Should You Visit Yellowstone?
For most travelers, late June through September is the best time to visit Yellowstone National Park.
Choose July or August if warm weather and maximum access to park facilities are your priorities. Choose September if you prefer cooler temperatures, wildlife viewing and a quieter experience. May and October can be rewarding shoulder-season choices, but you should be prepared for snow and changing road or facility conditions.
If you love snow and don’t mind cold temperatures, winter offers a completely different Yellowstone experience, with snow-covered forests, frozen landscapes, wildlife and steaming geothermal features creating spectacular scenery.
Most importantly, don’t pack for just one type of weather. Yellowstone’s weather can change quickly in every season, so layers and rain protection are essential.
Quick Answer
Best overall time: September
Best for warm weather: July–August
Best for hiking: July–August
Best for wildlife: Spring and fall
Best for fewer crowds: May, September and October
Best for snow: December–February
Most unpredictable: Spring and fall
Also Check: Where Is Yellowstone? Location, Map & Travel Guide