When to Plant Borage in Wisconsin
Wisconsin spans USDA hardiness 4a to 6a (zones 4a to 6a on this page). Plant borage 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
Borage planting calendar for Wisconsin, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Direct sow
May 1
Projected first harvest
Jun 30
Borage is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Borage planting calendar for Wisconsin, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Direct sow
Apr 26
Projected first harvest
Jun 25
Borage is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Borage planting calendar for Wisconsin, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Direct sow
Apr 21
Projected first harvest
Jun 20
Borage is ready to harvest in about 60 days. Full zone 5 guide (both 5a and 5b) →
Borage planting calendar for Wisconsin, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Direct sow
Apr 16
Projected first harvest
Jun 15
Borage is ready to harvest in about 60 days. Full zone 5 guide (both 5a and 5b) →
Borage planting calendar for Wisconsin, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Direct sow
Apr 11
Projected first harvest
Jun 10
Borage is ready to harvest in about 60 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 borage in the HomeSown library. Tap any for its full grow guide.
Common problems with borage
What to watch for, with identification and treatment for each
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