When to Plant Garlic in Idaho

Growing Garlic in Idaho: Complete Guide

Garlic (Allium sativum) is a fall-planted crop — it goes in the ground a few weeks before the first fall frost and overwinters for harvest the following summer. Depending on your zone, Idaho gardeners plant between September 10, 2026 (Zone 4a) and October 25, 2026 (Zone 7b).

Because Idaho stretches across 8 USDA hardiness zones (4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.

With 240 days to maturity, Garlic fits comfortably within Idaho's growing season in most zones. In the warmest parts of the state, a second planting later in the season may be possible.

Garlic requires full sun (6+ hours) and low to moderate moisture. Mountain-state gardens contend with short seasons and intense UV at elevation — cold nights can persist well into June at higher altitudes.

For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Idaho.