When to plant cucumber in Charleston
Cucumber is frost-tender, so every date keys off Charleston's last spring frost of Feb 8.
Step 1 · Sow
Start seeds indoors
Feb 11 – Mar 4
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 30 – Apr 20
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 19 – Jun 8
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 70 d
Charleston's 310-day season leaves this much room.
Cucumber on Charleston'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
FEB 8
DEC 15
Common questions
When can I sow cucumber outdoors in Charleston?
Direct-sow around late March (Mar 30–Apr 20) in Charleston, based on its local frost dates. Confidence 86%.
When will cucumber be ready to harvest in Charleston?
Expect to harvest from around mid May (May 19–Jun 8) in Charleston, based on its local frost dates. Confidence 80%.
When should I start cucumber seeds indoors in Charleston?
Start seeds indoors around mid February (Feb 11–Mar 4) in Charleston, based on its local frost dates. Confidence 85%.
When can I transplant cucumber outdoors in Charleston?
Transplant outdoors around late March (Mar 30–Apr 20) in Charleston, based on its local frost dates. Confidence 86%.
How long is the growing season in Charleston?
Charleston has roughly 310 frost-free days, which is enough time to grow cucumber to maturity outdoors.
The rule of thumb
Sow cucumber 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 Charleston's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.