Weather in Yellowstone National Park

March and April can still feel like winter in Yellowstone since the park doesn't fully thaw until late spring, which can make for some muddy trails – but it's all part of the adventure! Spring is the season for baby animals and if you're lucky, you might see bears emerging from hibernation and bison calves ('red dogs') running around the fields. Just make sure you bring a rain jacket – it's the wettest season.  

Summer brings warm, long days and plenty of sunshine to the park. It's the busiest time of year, but that's because of the great hiking conditions and full access to the park. The best part? Peak wildlife activity with large herds of bison gathering in the valleys, bears exploring open meadows and the best chance to see wolves in Lamar Valley. Occasional thunderstorms may roll through, but they're typically short-lived. 

Cooler temps return as the landscape turns colours with golden aspens. Crowds begin to thin out and animals start prepping for winter with some retreating to lower ground. The weather can be a bit all over the place as the season transitions to winter, so it's best to prepare for all elements. Expect generally pleasant days, cooler nights and the chance of snow dusting the ground by the end of the season.  

A magical time in the park when mountain peaks are snowcapped and the crowds are gone. You might be lucky to see geyser rain – this is when boiling water from a geyser erupts and transforms into ice crystals when it hits the freezing air. It's chilly during the day and even colder at night, so layer up. Keep in mind most roads close and the only areas with facilities open to the public are Mammoth Hot Springs and Old Faithful.