When to plant winter squash / pumpkin in Tulsa
Winter squash / Pumpkin is frost-tender, so every date keys off Tulsa's last spring frost of Mar 31.
Step 1 · Sow
Start seeds indoors
Mar 25 – Apr 15
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 26 – May 17
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 20 – Aug 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
85 – 120 d
Tulsa's 214-day season leaves this much room.
Winter squash / Pumpkin on Tulsa'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
MAR 31
NOV 3
Common questions
When can I sow winter squash / pumpkin outdoors in Tulsa?
Direct-sow around late April (Apr 26–May 17) in Tulsa, based on its local frost dates. Confidence 85%.
When will winter squash / pumpkin be ready to harvest in Tulsa?
Expect to harvest from around mid July (Jul 20–Aug 24) in Tulsa, based on its local frost dates. Confidence 79%.
When should I start winter squash / pumpkin seeds indoors in Tulsa?
Start seeds indoors around late March (Mar 25–Apr 15) in Tulsa, based on its local frost dates. Confidence 84%.
When can I transplant winter squash / pumpkin outdoors in Tulsa?
Transplant outdoors around late April (Apr 26–May 17) in Tulsa, based on its local frost dates. Confidence 85%.
How long is the growing season in Tulsa?
Tulsa has roughly 214 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 Tulsa's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.