When to Plant Thyme in Wyoming

Growing Thyme in Wyoming: Complete Guide

Thyme (Thymus vulgaris) is a warm-season crop that needs a head start indoors before Wyoming's last frost. Most Wyoming gardeners begin seeds indoors around Saturday, February 28, 2026 and move transplants outside around Saturday, May 9, 2026, after the risk of frost has passed.

Because Wyoming stretches across 4 USDA hardiness zones (4a, 4b, 5a, 5b), planting windows can shift by as much as two to four 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 90 days to maturity, Thyme needs the indoor head start that Wyoming's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Thyme requires full sun (6+ hours) and low (drought tolerant) moisture. Most of Wyoming receives adequate sunlight during the growing season, though gardeners in humid eastern regions should watch for fungal issues and ensure good air circulation.

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 Wyoming.