When to plant summer squash / zucchini in Tacoma
Summer squash / Zucchini is frost-tender, so every date keys off Tacoma's last spring frost of Mar 8.
Step 1 · Sow
Start seeds indoors
Mar 15 – Apr 5
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 12 – Jul 3
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 27 – Aug 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Tacoma's 246-day season leaves this much room.
Summer squash / Zucchini on Tacoma'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
MAR 8
NOV 13
Common questions
When can I sow summer squash / zucchini outdoors in Tacoma?
Direct-sow around mid June (Jun 12–Jul 3) in Tacoma, based on its local frost dates. Confidence 82%.
When will summer squash / zucchini be ready to harvest in Tacoma?
Expect to harvest from around late July (Jul 27–Aug 11) in Tacoma, based on its local frost dates. Confidence 76%.
When should I start summer squash / zucchini seeds indoors in Tacoma?
Start seeds indoors around mid March (Mar 15–Apr 5) in Tacoma, based on its local frost dates. Confidence 81%.
When can I transplant summer squash / zucchini outdoors in Tacoma?
Transplant outdoors around mid June (Jun 12–Jul 3) in Tacoma, based on its local frost dates. Confidence 82%.
How long is the growing season in Tacoma?
Tacoma has roughly 246 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 Tacoma's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.