When to plant summer squash / zucchini in Boise
Summer squash / Zucchini is frost-tender, so every date keys off Boise's last spring frost of May 2.
Step 1 · Sow
Start seeds indoors
May 1 – May 22
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 24 – Jun 14
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 8 – Jul 23
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Boise's 168-day season leaves this much room.
Summer squash / Zucchini on Boise'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 2
OCT 17
Common questions
When can I sow summer squash / zucchini outdoors in Boise?
Direct-sow around late May (May 24–Jun 14) in Boise, based on its local frost dates. Confidence 86%.
When will summer squash / zucchini be ready to harvest in Boise?
Expect to harvest from around early July (Jul 8–Jul 23) in Boise, based on its local frost dates. Confidence 80%.
When should I start summer squash / zucchini seeds indoors in Boise?
Start seeds indoors around early May (May 1–May 22) in Boise, based on its local frost dates. Confidence 85%.
When can I transplant summer squash / zucchini outdoors in Boise?
Transplant outdoors around late May (May 24–Jun 14) in Boise, based on its local frost dates. Confidence 86%.
How long is the growing season in Boise?
Boise 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 Boise's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.