When to Plant Flax in Zone 3
In USDA zone 3a, plant outdoors June 13 to September 10. (3a shown here — see 3a and 3b dates separately below.)
Flax planting calendar for USDA Zone 3a
Average last spring frost
May 30
Average first fall frost
September 10
Direct sow
Jun 13
Flax needs about 100 days to mature — longer than zone 3atypically stays frost-free, so it likely won't reliably ripen there outdoors without a head start indoors or season extension.
Flax planting calendar for USDA Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
Direct sow
Jun 3
Projected first harvest
Sep 11
Flax is ready to harvest in about 100 days, needing roughly 118 frost-free days in zone 3b.
Not sure whether you're in 3a or 3b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
1 variety of flax in the HomeSown library. Tap any for its full grow guide.
Common problems with flax
What to watch for, with identification and treatment for each
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