When to Plant Summer Squash in Zone 6
In USDA zone 6a, start seeds indoors around April 4, transplant or plant outdoors May 9 to June 28, and expect your first harvest around June 28. (6a shown here — see 6a and 6b dates separately below.)
Summer Squash planting calendar for USDA Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Start seeds indoors
Apr 4
Transplant outdoors
May 9
Projected first harvest
Jun 28
Most summer squash mature in about 50 days, needing roughly 168 frost-free days in zone 6a.
Summer Squash planting calendar for USDA Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Start seeds indoors
Mar 30
Transplant outdoors
May 4
Projected first harvest
Jun 23
Most summer squash mature in about 50 days, needing roughly 178 frost-free days in zone 6b.
Not sure whether you're in 6a or 6b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
3 varieties of summer squash in the HomeSown library. Tap any for its full grow guide.
Common problems with summer squash
What to watch for, with identification and treatment for each
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