Grand Teton National Park Weather & Seasons

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Since Grand Teton weather can be unpredictable at any time of year, it’s recommended that you are always prepared with a warm jacket, layers of clothing and rain gear. The heart of the summer typically spans from July through August with average temperatures of 70 to 80 in lower elevations. Fall is pleasant and quiet but be prepared for early winter weather. Winter months bring cold temperatures, often in the single digits with epic amounts of snow. Spring is unpredictable. Depending on the year, winter can drag on until June.

Summer

Dates: June - August

Weather: Summers often bring afternoon thundershowers, and lightning storms are common. The mild temperatures make it ideal for touring Grand Teton’s higher elevations. Average summer daytime temperatures range in the 70s with lows at nights in the upper 30s and lower 40s.

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Fall

Dates: September - October

Weather: Fall brings cold nights and sunny pleasant days, though you will find snowstorms increasing in frequency and intensity as winter approaches. Daytime temperatures in September are in the upper 60s, falling to the mid-50s by October and even lower (the upper 30s) by November. Nighttime lows are in the 30s in September, the 20s in October and the teens by November.

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Winter

Dates: November - early April

Weather: Days are beautifully sunny (between the storms) and nights are extremely cold and frigid. Winter travel in Grand Teton will necessitate four-wheel drive or all-weather tires. Daytime temperatures average in the 20s during the winter months of December and January, warming to the 30s by February and reaching as high as 40 by March. Nights hover close to zero until March when it may only reach 11 degrees F.

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Spring

Dates: April - May

Weather: Spring offers mild days with cool nights, but trails will be covered with snow until late May. Rain and even occasional snow is common. Temperatures during the spring begin to warm up in May, with the highs reaching in the low 60s; lows are usually in the 30s. By June the daytime highs get into the lower 70s for pleasant walking and hiking temperatures.

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