When to plant winter squash / pumpkin in Pittsburgh
Winter squash / Pumpkin is frost-tender, so every date keys off Pittsburgh's last spring frost of Apr 17.
Step 1 · Sow
Start seeds indoors
Apr 8 – Apr 29
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 11 – Jun 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Aug 4 – Sep 8
Picking runs until conditions turn against the crop.
Window
Days to maturity
85 – 120 d
Pittsburgh's 188-day season leaves this much room.
Winter squash / Pumpkin on Pittsburgh'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
HARVEST
APR 17
OCT 25
Common questions
When can I sow winter squash / pumpkin outdoors in Pittsburgh?
Direct-sow around mid May (May 11–Jun 1) in Pittsburgh, based on its local frost dates. Confidence 79%.
When will winter squash / pumpkin be ready to harvest in Pittsburgh?
Expect to harvest from around early August (Aug 4–Sep 8) in Pittsburgh, based on its local frost dates. Confidence 73%.
When should I start winter squash / pumpkin seeds indoors in Pittsburgh?
Start seeds indoors around early April (Apr 8–Apr 29) in Pittsburgh, based on its local frost dates. Confidence 77%.
When can I transplant winter squash / pumpkin outdoors in Pittsburgh?
Transplant outdoors around mid May (May 11–Jun 1) in Pittsburgh, based on its local frost dates. Confidence 79%.
How long is the growing season in Pittsburgh?
Pittsburgh has roughly 188 frost-free days, which is enough time to grow winter squash / pumpkin to maturity outdoors.
The rule of thumb
Sow winter squash / pumpkin 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 Pittsburgh's frost dates.
Confidence 81/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.