When to plant summer squash / zucchini in Salt Lake City

Summer squash / Zucchini is frost-tender, so every date keys off Salt Lake City's last spring frost of Apr 13.
Step 1 · Sow
Start seeds indoors
Apr 19 – May 10
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
Salt Lake City's 194-day season leaves this much room.
Summer squash / Zucchini on Salt Lake City'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
APR 13
OCT 26

Common questions

When can I sow summer squash / zucchini outdoors in Salt Lake City?

Direct-sow around late May (May 24–Jun 14) in Salt Lake City, based on its local frost dates. Confidence 86%.

When will summer squash / zucchini be ready to harvest in Salt Lake City?

Expect to harvest from around early July (Jul 8–Jul 23) in Salt Lake City, based on its local frost dates. Confidence 80%.

When should I start summer squash / zucchini seeds indoors in Salt Lake City?

Start seeds indoors around mid April (Apr 19–May 10) in Salt Lake City, based on its local frost dates. Confidence 85%.

When can I transplant summer squash / zucchini outdoors in Salt Lake City?

Transplant outdoors around late May (May 24–Jun 14) in Salt Lake City, based on its local frost dates. Confidence 86%.

How long is the growing season in Salt Lake City?

Salt Lake City has roughly 194 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 Salt Lake City's frost dates.

Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.