When to Plant Thyme in Wisconsin
Wisconsin spans USDA hardiness 4a to 6a (zones 4a to 6a on this page). Plant thyme by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 4a · Zone 4b · Zone 5a · Zone 5b · Zone 6a
Thyme planting calendar for Wisconsin, 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. Full zone 4 guide (both 4a and 4b) →
Thyme planting calendar for Wisconsin, 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. Full zone 4 guide (both 4a and 4b) →
Thyme planting calendar for Wisconsin, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Start seeds indoors
Feb 24
Transplant outdoors
May 19
Projected first harvest
Aug 2
Thyme is ready to harvest in about 75 days. Full zone 5 guide (both 5a and 5b) →
Thyme planting calendar for Wisconsin, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Start seeds indoors
Feb 19
Transplant outdoors
May 14
Projected first harvest
Jul 28
Thyme is ready to harvest in about 75 days. Full zone 5 guide (both 5a and 5b) →
Thyme planting calendar for Wisconsin, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Start seeds indoors
Feb 14
Transplant outdoors
May 9
Projected first harvest
Jul 23
Thyme is ready to harvest in about 75 days. Full zone 6 guide (both 6a and 6b) →
Not sure which half-zone you're in? 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
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