When to Plant Summer Squash in Zone 4
In USDA zone 4a, start seeds indoors around April 24, transplant or plant outdoors May 29 to July 18, and expect your first harvest around July 18. (4a shown here — see 4a and 4b dates separately below.)
Summer Squash planting calendar for USDA Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Start seeds indoors
Apr 24
Transplant outdoors
May 29
Projected first harvest
Jul 18
Most summer squash mature in about 50 days, needing roughly 128 frost-free days in zone 4a.
Summer Squash planting calendar for USDA Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Start seeds indoors
Apr 19
Transplant outdoors
May 24
Projected first harvest
Jul 13
Most summer squash mature in about 50 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
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
🌱 Grow summer squash with a calendar built for your exact yard
HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.
Start your free garden →