Idaho Planting Zones & Schedule

Stretching across rugged mountains and fertile valleys, Idaho’s USDA growing zones range from Zone 3 in the north and higher elevations to Zone 7 in the warmer southern areas. The cooler regions of northern Idaho and the mountain ranges fall within Zones 3 to 5, where hardy vegetables like potatoes, kale, and carrots perform best.

Meanwhile, southern areas such as Boise and Twin Falls sit in Zones 6 and 7, offering longer, warmer growing seasons suitable for crops like tomatoes, peppers, and squash.

Idaho Last & First Frost Dates

City	Last Frost Date	First Frost Date
Boise	5/1	10/11
Coeur d'Alene	5/11	10/1
Eagle	5/1	10/11
Garden City	5/1	10/11
Idaho Falls	6/1	9/11
Lewiston	4/11	10/21
Meridian	5/1	10/11
Moscow	5/21	9/11
Nampa	5/1	10/11
Twin Falls	5/11	10/1

*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 Idaho averages about 145 days statewide but can be as low as 30 days in high-elevation areas. Refer to the planting schedules below to determine the best timing for your zone.