When to Plant Rosemary in Alaska

Growing Rosemary in Alaska: Complete Guide

Rosemary (Salvia rosmarinus) is a warm-season crop that needs a head start indoors before Alaska's last frost. Depending on your zone, Alaska gardeners start seeds indoors between January 4, 2027 (Zone 8b) and April 6, 2027 (Zone 1a), then move transplants outside once their zone's last frost has passed — the zone table above has your exact dates.

Because Alaska stretches across 16 USDA hardiness zones (1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b), 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 120 days to maturity, Rosemary needs the indoor head start that Alaska's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Rosemary requires full sun (6+ hours) and low (drought tolerant) moisture. Alaska's long summer days accelerate growth, but frost can arrive early in August — season extension with row covers is essential.

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 Alaska.