When to Plant St. John's Wort in Minnesota
Minnesota spans USDA hardiness 3a to 5a (zones 3a to 5a on this page). Plant st. john's wort by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 3a · Zone 3b · Zone 4a · Zone 4b · Zone 5a
St. John's Wort planting calendar for Minnesota, Zone 3a
Average last spring frost
May 30
Average first fall frost
September 10
Start seeds indoors
Apr 4
Transplant outdoors
Jun 13
Projected first harvest
Oct 11
St. John's Wort is ready to harvest in about 120 days. Full zone 3 guide (both 3a and 3b) →
St. John's Wort planting calendar for Minnesota, Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
Start seeds indoors
Mar 25
Transplant outdoors
Jun 3
Projected first harvest
Oct 1
St. John's Wort is ready to harvest in about 120 days. Full zone 3 guide (both 3a and 3b) →
St. John's Wort planting calendar for Minnesota, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Start seeds indoors
Mar 20
Transplant outdoors
May 29
Projected first harvest
Sep 26
St. John's Wort is ready to harvest in about 120 days. Full zone 4 guide (both 4a and 4b) →
St. John's Wort planting calendar for Minnesota, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Start seeds indoors
Mar 15
Transplant outdoors
May 24
Projected first harvest
Sep 21
St. John's Wort is ready to harvest in about 120 days. Full zone 4 guide (both 4a and 4b) →
St. John's Wort planting calendar for Minnesota, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Start seeds indoors
Mar 10
Transplant outdoors
May 19
Projected first harvest
Sep 16
St. John's Wort is ready to harvest in about 120 days. Full zone 5 guide (both 5a and 5b) →
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 st. john's wort in the HomeSown library. Tap any for its full grow guide.
Common problems with st. john's wort
What to watch for, with identification and treatment for each
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