When to plant leek in Riverside
Leek is cold-hardy, so every date keys off Riverside's frost dates of Feb 16.
Step 1 · Sow
Start seeds indoors
Dec 8 – Dec 29
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Feb 2 – Feb 23
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 13 – Jun 2
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Riverside's 293-day season leaves this much room.
Leek 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 will leek be ready to harvest in Riverside?
Expect to harvest from around mid May (May 13–Jun 2) in Riverside, based on its local frost dates. Confidence 70%.
When should I start leek seeds indoors in Riverside?
Start seeds indoors around early December (Dec 8–Dec 29) in Riverside, based on its local frost dates. Confidence 74%.
When can I transplant leek outdoors in Riverside?
Transplant outdoors around early February (Feb 2–Feb 23) 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 leek to maturity outdoors.
The rule of thumb
Sow leek as soon as the soil is workable — it tolerates cool weather and light frost. 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.