When to Plant Thyme in Zone 4
In USDA zone 4a, start seeds indoors around March 6, transplant or plant outdoors May 29 to August 12, and expect your first harvest around August 12. (4a shown here — see 4a and 4b dates separately below.)
Thyme planting calendar for USDA Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Start seeds indoors
Mar 6
Transplant outdoors
May 29
Projected first harvest
Aug 12
Thyme is ready to harvest in about 75 days, needing roughly 128 frost-free days in zone 4a.
Thyme planting calendar for USDA Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Start seeds indoors
Mar 1
Transplant outdoors
May 24
Projected first harvest
Aug 7
Thyme is ready to harvest in about 75 days, needing roughly 138 frost-free days in zone 4b.
Not sure whether you're in 4a or 4b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
1 variety of thyme in the HomeSown library. Tap any for its full grow guide.
Common problems with thyme
What to watch for, with identification and treatment for each
🌱 Grow thyme with a calendar built for your exact yard
HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.
Start your free garden →