When to plant cucumber in San Bernardino
Cucumber is frost-tender, so every date keys off San Bernardino's last spring frost of Feb 23.
Step 1 · Sow
Start seeds indoors
Mar 1 – Mar 22
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 10 – May 1
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 30 – Jun 19
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 70 d
San Bernardino's 284-day season leaves this much room.
Cucumber on San Bernardino'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 23
DEC 9
Common questions
When can I sow cucumber outdoors in San Bernardino?
Direct-sow around early April (Apr 10–May 1) in San Bernardino, based on its local frost dates. Confidence 76%.
When will cucumber be ready to harvest in San Bernardino?
Expect to harvest from around late May (May 30–Jun 19) in San Bernardino, based on its local frost dates. Confidence 70%.
When should I start cucumber seeds indoors in San Bernardino?
Start seeds indoors around early March (Mar 1–Mar 22) in San Bernardino, based on its local frost dates. Confidence 74%.
When can I transplant cucumber outdoors in San Bernardino?
Transplant outdoors around early April (Apr 10–May 1) in San Bernardino, based on its local frost dates. Confidence 76%.
How long is the growing season in San Bernardino?
San Bernardino has roughly 284 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 San Bernardino's frost dates.
Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.