When to Plant Borage in Zone 4
In USDA zone 4a, plant outdoors May 1 to June 30, and expect your first harvest around June 30. (4a shown here — see 4a and 4b dates separately below.)
Borage planting calendar for USDA 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, needing roughly 128 frost-free days in zone 4a.
Borage planting calendar for USDA 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, 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 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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