When to plant summer squash / zucchini in Berlin
Summer squash / Zucchini is frost-tender, so every date keys off Berlin's last spring frost of Apr 25.
Step 1 · Sow
Start seeds indoors
Apr 11 – May 2
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 2 – May 23
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 16 – Jul 1
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Berlin's 168-day season leaves this much room.
Summer squash / Zucchini on Berlin'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 25
OCT 10
Common questions
When can I sow summer squash / zucchini outdoors in Berlin?
Direct-sow around early May (May 2–May 23) in Berlin, based on its local frost dates. Confidence 86%.
When will summer squash / zucchini be ready to harvest in Berlin?
Expect to harvest from around mid June (Jun 16–Jul 1) in Berlin, based on its local frost dates. Confidence 77%.
When should I start summer squash / zucchini seeds indoors in Berlin?
Start seeds indoors around mid April (Apr 11–May 2) in Berlin, based on its local frost dates. Confidence 82%.
When can I transplant summer squash / zucchini outdoors in Berlin?
Transplant outdoors around early May (May 2–May 23) in Berlin, based on its local frost dates. Confidence 86%.
How long is the growing season in Berlin?
Berlin has roughly 168 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 Berlin's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.