When to Plant Spinach in Zone 3
In USDA zone 3a, start seeds indoors around March 28, transplant or plant outdoors May 2 to June 13, and expect your first harvest around June 13. Zone 3 also has a fall planting window opening around August 6. (3a shown here — see 3a and 3b dates separately below.)
Spinach planting calendar for USDA Zone 3a
Average last spring frost
May 30
Average first fall frost
September 10
spring planting
Start seeds indoors
Mar 28
Transplant outdoors
May 2
Projected first harvest
Jun 13
fall planting
Direct sow
Aug 6
Projected first harvest
Sep 17
spring planting
fall planting
Most spinach mature in about 41 to 45 days depending on the variety, needing roughly 103 frost-free days in zone 3a.
Spinach planting calendar for USDA Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
spring planting
Start seeds indoors
Mar 18
Transplant outdoors
Apr 22
Projected first harvest
Jun 3
fall planting
Direct sow
Aug 11
Projected first harvest
Sep 22
spring planting
fall planting
Most spinach mature in about 41 to 45 days depending on the variety, 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
3 varieties of spinach in the HomeSown library. Tap any for its full grow guide.
Common problems with spinach
What to watch for, with identification and treatment for each
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