Yellowstone National Park, America’s first national park, spans over two million acres of forests, rivers, geysers, and mountains. Its high elevation and varied terrain create a wide range of temperatures throughout the year. Understanding the average temperature by month can help visitors plan their trips, pack appropriately, and prepare for the park’s unpredictable weather. Yellowstone’s climate is influenced by its elevation, which ranges from roughly 5,282 feet at the Madison River to over 11,000 feet at Eagle Peak. As a result, even in summer, temperatures can drop sharply at night, and winter conditions bring snow and freezing weather.
Table of Contents
Quick Reference Table: Average Temperature in Yellowstone National Park by Month
| Month | Average Daytime Temperature (°F) | Average Nighttime Temperature (°F) | Notes |
|---|---|---|---|
| January | 15 – 30 | -5 or lower | Coldest month, heavy snow, limited access |
| February | 20 – 35 | -5 to -10 | Deep winter conditions, snow-covered roads |
| March | 25 – 40 | Below 10 | Snow begins to melt at lower elevations |
| April | 35 – 50 | Around 20 | Wet and slushy conditions, spring transition |
| May | 50 – 65 | Around 30 | Warmer, wildlife active, snow mostly gone in valleys |
| June | 65 – 75 | 35 – 45 | Summer approaching, pleasant conditions, occasional rain |
| July | 70 – 80 | 40 – 50 | Warmest month, peak tourist season, afternoon thunderstorms possible |
| August | 70 – 80 | 40 – 50 | Warm, lush landscapes, busy tourist season |
| September | 60 – 70 | 35 – 40 | Early fall, cooler, fewer crowds, wildlife preparing for winter |
| October | 50 – 60 | 20 – 30 | Crisp autumn, fall foliage, some snow at higher elevations |
| November | 35 – 45 | Below 20 | Approach of winter, roads starting to close, snow increases |
| December | 25 – 35 | Below 0 | Full winter conditions, most roads closed, snow and ice prevalent |
January: The Coldest Month
January is typically the coldest month in Yellowstone. Average daytime temperatures often range from 15°F to 30°F, while nighttime lows can drop to -5°F or lower in some areas. Snowfall is frequent, and snowpack accumulates across the park, creating ideal conditions for winter sports such as cross-country skiing and snowmobiling. Visitors in January must be prepared for extreme cold, icy roads, and limited accessibility, as most park roads are closed to standard vehicles during this month.
February: Deep Winter Conditions
February continues the frigid conditions of January, with average daytime temperatures between 20°F and 35°F. Nights remain bitterly cold, often falling to -5°F to -10°F. Snow accumulation can be significant, and some areas of the park may experience strong winds, increasing the chill factor. Wildlife remains largely concentrated in valleys where food is available, and many geothermal features produce dramatic steam plumes visible against the snowy landscape. Visitors traveling in February typically rely on snowcoaches or snowmobiles to explore the park.
March: Transition to Spring
March marks the gradual transition from deep winter to early spring. Average highs range from 25°F to 40°F, while nighttime lows often remain below 10°F. Snow begins to melt in lower elevations, creating wet and slushy conditions on trails and roads that remain open. Despite the lingering winter, the days start to lengthen, providing more daylight for sightseeing. Wildlife begins to move more freely, and visitors may catch early signs of spring in lower valleys. Roads remain limited, and most of the park is still inaccessible to standard vehicles.
April: Early Spring
April brings slightly milder temperatures, with daytime averages ranging from 35°F to 50°F and nighttime lows near 20°F. Snow continues to melt in lower regions, but higher elevations remain snow-covered. Rain and melting snow can make roads and trails slippery, and some areas may experience flooding from snowmelt. This month is a transitional period, with increasing wildlife activity as animals emerge from winter habitats. Visitors should dress in layers and be prepared for rapidly changing weather.
May: Spring Awakening
May is considered the beginning of Yellowstone’s peak visiting season due to milder temperatures and the return of most park facilities. Daytime highs typically range from 50°F to 65°F, while nighttime lows can still drop to 30°F or lower in some areas. Snow may still be present at higher elevations, but valleys and lower elevations are usually clear. Wildflowers begin to bloom, rivers swell with snowmelt, and wildlife becomes more active. Spring rains are common, so waterproof gear is recommended for visitors during this month.
June: Summer Approaches
By June, Yellowstone experiences warmer weather and more stable conditions. Daytime temperatures generally range from 65°F to 75°F, with nighttime lows between 35°F and 45°F. Snow is mostly confined to the highest peaks, and most park roads and hiking trails are open. June is a popular time for visitors because the weather is pleasant, the landscape is lush and green, and wildlife sightings are frequent. Rain showers and thunderstorms can occur, particularly in the afternoon, so visitors should remain prepared for sudden weather changes.
July: Peak Summer
July is the warmest month in Yellowstone, making it ideal for outdoor exploration. Average daytime temperatures typically range from 70°F to 80°F, with nighttime lows around 40°F to 50°F. Snow is limited to the highest elevations, and most park services, lodges, and roads are fully operational. This month attracts the largest number of visitors, and popular sites like Old Faithful and the Grand Prismatic Spring area can become crowded. Thunderstorms are common in the afternoons, so carrying rain gear is advised.
August: Warm and Busy
August continues the warm summer pattern, with daytime temperatures averaging between 70°F and 80°F and nighttime lows from 40°F to 50°F. Wildlife is active, and the park is vibrant with lush greenery and flowing rivers. Afternoon thunderstorms remain a possibility, and visitors should plan outdoor activities accordingly. August is still considered part of the peak tourist season, so early arrival at popular locations is recommended to avoid crowds.
September: Early Fall
September marks the transition to fall, with cooler temperatures and fewer visitors. Daytime highs usually range from 60°F to 70°F, while nighttime lows can drop to 35°F to 40°F. Fall colors begin to appear in the park’s forests, creating stunning scenery for photographers and hikers. Wildlife activity increases as animals prepare for winter. Weather is generally stable, but occasional early snowstorms at higher elevations can occur. September offers a quieter and more comfortable experience for visitors willing to explore Yellowstone before the winter season.
October: Crisp Autumn
October brings cooler weather and shorter days. Average daytime temperatures range from 50°F to 60°F, with nighttime lows dropping into the 20°F to 30°F range. Snow can appear at higher elevations, and roads may begin to close for winter maintenance. Wildlife such as elk and deer are active during rutting season, providing opportunities for observation. Visitors should dress in layers and be prepared for cold mornings and evenings. The fall foliage combined with smaller crowds makes October an appealing time for a Yellowstone visit.
November: Preparing for Winter
November marks the approach of winter, with daytime temperatures generally between 35°F and 45°F and nighttime lows often below 20°F. Snowfall becomes frequent, particularly at higher elevations, and most park roads start closing to regular vehicles. Winter storms can create challenging driving conditions and limit accessibility to popular sites. Visitors planning a late fall trip should check road status updates and prepare for potential winter travel challenges.
December: Winter Wonderland
December brings full winter conditions to Yellowstone, with average daytime temperatures between 25°F and 35°F and nighttime lows often dropping below 0°F. Snow covers much of the park, creating a serene and quiet environment. Most roads are closed to standard vehicles, and snowcoaches or snowmobiles are necessary for travel beyond the park entrances. Despite the cold, the winter landscape offers unique beauty, with steaming geysers and wildlife adapted to snowy conditions. Proper preparation and winter gear are essential for safe and enjoyable exploration.
Conclusion
Yellowstone National Park experiences a wide range of temperatures throughout the year, from bitterly cold winters to warm summer days. Average temperatures vary significantly by month, and elevation differences within the park can create local variations.
Winter months from December through March bring frigid temperatures, heavy snow, and limited road access. Spring offers gradually warming temperatures and increasing wildlife activity, though snow can linger at higher elevations. Summer months provide the warmest and most stable weather, ideal for exploring geothermal features, hiking trails, and scenic drives. Fall brings cooler temperatures, fewer crowds, and stunning foliage.
Understanding Yellowstone’s average temperature by month allows visitors to plan trips that match their preferred weather conditions and activities. Dressing appropriately, checking road and weather updates, and being prepared for rapidly changing conditions ensure a safe and enjoyable visit to one of America’s most iconic national parks.