When to plant summer squash / zucchini in Cleveland
Summer squash / Zucchini is frost-tender, so every date keys off Cleveland's last spring frost of Apr 5.
Step 1 · Sow
Start seeds indoors
Apr 3 – Apr 24
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 28 – Jun 18
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 12 – Jul 27
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Cleveland's 227-day season leaves this much room.
Summer squash / Zucchini on Cleveland's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
APR 5
NOV 16
Common questions
When can I sow summer squash / zucchini outdoors in Cleveland?
Direct-sow around late May (May 28–Jun 18) in Cleveland, based on its local frost dates. Confidence 81%.
When will summer squash / zucchini be ready to harvest in Cleveland?
Expect to harvest from around mid July (Jul 12–Jul 27) in Cleveland, based on its local frost dates. Confidence 76%.
When should I start summer squash / zucchini seeds indoors in Cleveland?
Start seeds indoors around early April (Apr 3–Apr 24) in Cleveland, based on its local frost dates. Confidence 80%.
When can I transplant summer squash / zucchini outdoors in Cleveland?
Transplant outdoors around late May (May 28–Jun 18) in Cleveland, based on its local frost dates. Confidence 81%.
How long is the growing season in Cleveland?
Cleveland has roughly 227 frost-free days, which is enough time to grow summer squash / zucchini to maturity outdoors.
The rule of thumb
Sow summer squash / zucchini 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and Cleveland's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.