When to plant summer squash / zucchini in Glasgow
Summer squash / Zucchini is frost-tender, so every date keys off Glasgow's last spring frost of May 5.
Step 1 · Sow
Start seeds indoors
Apr 21 – May 12
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 12 – Jun 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 26 – Jul 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Glasgow's 163-day season leaves this much room.
Summer squash / Zucchini on Glasgow'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
MAY 5
OCT 15
Common questions
When can I sow summer squash / zucchini outdoors in Glasgow?
Direct-sow around mid May (May 12–Jun 2) in Glasgow, based on its local frost dates. Confidence 70%.
When will summer squash / zucchini be ready to harvest in Glasgow?
Expect to harvest from around late June (Jun 26–Jul 11) in Glasgow, based on its local frost dates. Confidence 63%.
When should I start summer squash / zucchini seeds indoors in Glasgow?
Start seeds indoors around late April (Apr 21–May 12) in Glasgow, based on its local frost dates. Confidence 67%.
When can I transplant summer squash / zucchini outdoors in Glasgow?
Transplant outdoors around mid May (May 12–Jun 2) in Glasgow, based on its local frost dates. Confidence 70%.
How long is the growing season in Glasgow?
Glasgow has roughly 163 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 Glasgow's frost dates.
Confidence 70/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.