When to plant summer squash / zucchini in Spokane
Summer squash / Zucchini is frost-tender, so every date keys off Spokane's last spring frost of Apr 30.
Step 1 · Sow
Start seeds indoors
Apr 28 – May 19
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 11 – Jul 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 26 – Aug 10
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Spokane's 162-day season leaves this much room.
Summer squash / Zucchini on Spokane'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 30
OCT 9
Common questions
When can I sow summer squash / zucchini outdoors in Spokane?
Direct-sow around mid June (Jun 11–Jul 2) in Spokane, based on its local frost dates. Confidence 83%.
When will summer squash / zucchini be ready to harvest in Spokane?
Expect to harvest from around late July (Jul 26–Aug 10) in Spokane, based on its local frost dates. Confidence 77%.
When should I start summer squash / zucchini seeds indoors in Spokane?
Start seeds indoors around late April (Apr 28–May 19) in Spokane, based on its local frost dates. Confidence 82%.
When can I transplant summer squash / zucchini outdoors in Spokane?
Transplant outdoors around mid June (Jun 11–Jul 2) in Spokane, based on its local frost dates. Confidence 83%.
How long is the growing season in Spokane?
Spokane has roughly 162 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 Spokane's frost dates.
Confidence 86/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.