When to plant summer squash / zucchini in Winnipeg
Summer squash / Zucchini is frost-tender, so every date keys off Winnipeg's last spring frost of May 8.
Step 1 · Sow
Start seeds indoors
May 2 – May 23
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 13 – Jul 4
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 28 – Aug 12
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Winnipeg's 154-day season leaves this much room.
Summer squash / Zucchini on Winnipeg'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 8
OCT 10
Common questions
When can I sow summer squash / zucchini outdoors in Winnipeg?
Direct-sow around mid June (Jun 13–Jul 4) in Winnipeg, based on its local frost dates. Confidence 81%.
When will summer squash / zucchini be ready to harvest in Winnipeg?
Expect to harvest from around late July (Jul 28–Aug 12) in Winnipeg, based on its local frost dates. Confidence 76%.
When should I start summer squash / zucchini seeds indoors in Winnipeg?
Start seeds indoors around early May (May 2–May 23) in Winnipeg, based on its local frost dates. Confidence 80%.
When can I transplant summer squash / zucchini outdoors in Winnipeg?
Transplant outdoors around mid June (Jun 13–Jul 4) in Winnipeg, based on its local frost dates. Confidence 81%.
How long is the growing season in Winnipeg?
Winnipeg has roughly 154 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 Winnipeg's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.