Montana Planting Zones & Schedule

Montana’s USDA growing zones range from Zone 3 to Zone 6. Most of the state falls into Zones 3 and 4, where cold-hardy plants may thrive but warm-season crops should be started early indoors.

Some areas along the western border of Montana, like Hamilton and Missoula, fall into Zones 5 and 6. The climate gets a little warmer in these areas, making them suitable for cool-season crops like carrots, peas, spinach, and kale.

Montana Last & First Frost Dates

City	Last Frost Date	First Frost Date
Billings	5/11	10/1
Bozeman	6/1	9/21
Four Corners	6/1	9/11
Great Falls	5/21	9/21
Helena	5/21	9/21
Livingston	6/1	9/11
Lockwood	5/11	10/1
Missoula	5/21	9/21
Sidney	5/21	9/21
Whitefish	6/1	9/11

*Keep in mind that frost can occur before or after these dates. Watch your local weather to determine the best time to plant.

The growing season in Montana lasts an average of about 135 days statewide, ranging from less than 90 frost-free days in some areas to over 150 in others. Refer to the planting schedules below to determine the best timing for your zone.