When to plant cucumber in Riverside
Cucumber is frost-tender, so every date keys off Riverside's last spring frost of Feb 16.
Step 1 · Sow
Start seeds indoors
Mar 12 – Apr 2
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 9 – Apr 30
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 29 – Jun 18
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 70 d
Riverside's 293-day season leaves this much room.
Cucumber on Riverside'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 16
DEC 6
Common questions
When can I sow cucumber outdoors in Riverside?
Direct-sow around early April (Apr 9–Apr 30) in Riverside, based on its local frost dates. Confidence 78%.
When will cucumber be ready to harvest in Riverside?
Expect to harvest from around late May (May 29–Jun 18) in Riverside, based on its local frost dates. Confidence 70%.
When should I start cucumber seeds indoors in Riverside?
Start seeds indoors around mid March (Mar 12–Apr 2) in Riverside, based on its local frost dates. Confidence 74%.
When can I transplant cucumber outdoors in Riverside?
Transplant outdoors around early April (Apr 9–Apr 30) in Riverside, based on its local frost dates. Confidence 78%.
How long is the growing season in Riverside?
Riverside has roughly 293 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 Riverside's frost dates.
Confidence 78/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.