Bitterroot Valley Weather

The Bitterroot Valley is known as the “Banana Belt” of Montana as the weather is far less severe than in other parts of the state. Bitterroot Valley weather is known for ideal summer conditions with daytime high’s normally in the 80’s and cool, crisp evenings that dip into the 40’s and 50’s.

Spring and fall are also mild and tend to be drier and warmer than the rest of Montana, and are excellent times to visit the area.

Winter brings cold temperatures and snow in December, January and February, although not as severe as in most parts of the state. The valley floor generally receives less than a foot of measurable snow each year, but the Lost Trail Ski Area commonly receives in excess of 200″ of snow per year only an hour’s drive from Hamilton.

Microclimates can be found throughout the valley due to the variety of elevations and bodies of water. Although generally pleasant, Bitterroot Valley weather can change quickly and we always recommend taking along a jacket or coat whenever you are outdoors.

Nights are cool throughout the year, creating pleasant sleeping conditions. Temperatures can reach 100 in late July and early August, and sub-zero temperatures are possible from late November into April, so plan accordingly with lots of layers.

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Bitterroot Valley Weather Statistics

Average Rainfall: 12-15 inches per year.

Average Annual Snowfall at Lost Trail Ski Area: 200+ inches

Average Annual Snowfall on Valley Floor: 6 inches

Average Annual Sunny Days: 270

Average Annual Growing Days: 130-150

Daylight Hours – June 21: 16.5

Altitude: 3,200 – 3,890 feet

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Bitterroot Valley Average Monthly Temperatures (ºF)

Month	High	Low
January	34	16
February	41	21
March	48	25
April	57	31
May	66	38
June	74	45
July	83	49
August	81	47
September	70	39
October	59	31
November	43	23
December	34	17