When to plant summer squash / zucchini in Billings
Summer squash / Zucchini is frost-tender, so every date keys off Billings's last spring frost of May 8.
Step 1 · Sow
Start seeds indoors
May 6 – May 27
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 10 – Jul 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 25 – Aug 9
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Billings's 150-day season leaves this much room.
Summer squash / Zucchini on Billings'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 4
Common questions
When can I sow summer squash / zucchini outdoors in Billings?
Direct-sow around early June (Jun 10–Jul 1) in Billings, based on its local frost dates. Confidence 87%.
When will summer squash / zucchini be ready to harvest in Billings?
Expect to harvest from around late July (Jul 25–Aug 9) in Billings, based on its local frost dates. Confidence 81%.
When should I start summer squash / zucchini seeds indoors in Billings?
Start seeds indoors around early May (May 6–May 27) in Billings, based on its local frost dates. Confidence 86%.
When can I transplant summer squash / zucchini outdoors in Billings?
Transplant outdoors around early June (Jun 10–Jul 1) in Billings, based on its local frost dates. Confidence 87%.
How long is the growing season in Billings?
Billings has roughly 150 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 Billings's frost dates.
Confidence 90/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.