When to plant summer squash / zucchini in Frankfurt
Summer squash / Zucchini is frost-tender, so every date keys off Frankfurt's last spring frost of Apr 24.
Step 1 · Sow
Start seeds indoors
Apr 10 – May 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 1 – May 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 15 – Jun 30
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Frankfurt's 175-day season leaves this much room.
Summer squash / Zucchini on Frankfurt'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 24
OCT 16
Common questions
When can I sow summer squash / zucchini outdoors in Frankfurt?
Direct-sow around early May (May 1–May 22) in Frankfurt, based on its local frost dates. Confidence 72%.
When will summer squash / zucchini be ready to harvest in Frankfurt?
Expect to harvest from around mid June (Jun 15–Jun 30) in Frankfurt, based on its local frost dates. Confidence 65%.
When should I start summer squash / zucchini seeds indoors in Frankfurt?
Start seeds indoors around early April (Apr 10–May 1) in Frankfurt, based on its local frost dates. Confidence 68%.
When can I transplant summer squash / zucchini outdoors in Frankfurt?
Transplant outdoors around early May (May 1–May 22) in Frankfurt, based on its local frost dates. Confidence 72%.
How long is the growing season in Frankfurt?
Frankfurt has roughly 175 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 Frankfurt's frost dates.
Confidence 72/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.