When to plant leek in San Jose
Leek is cold-hardy, so every date keys off San Jose's frost dates of Feb 12.
Step 1 · Sow
Start seeds indoors
Dec 4 – Dec 25
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Dec 25 – Jan 15
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 4 – Apr 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
San Jose's 294-day season leaves this much room.
Leek on San Jose'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 12
DEC 3
Common questions
When will leek be ready to harvest in San Jose?
Expect to harvest from around early April (Apr 4–Apr 24) in San Jose, based on its local frost dates. Confidence 74%.
When should I start leek seeds indoors in San Jose?
Start seeds indoors around early December (Dec 4–Dec 25) in San Jose, based on its local frost dates. Confidence 78%.
When can I transplant leek outdoors in San Jose?
Transplant outdoors around late December (Dec 25–Jan 15) in San Jose, based on its local frost dates. Confidence 80%.
How long is the growing season in San Jose?
San Jose has roughly 294 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 San Jose's frost dates.
Confidence 82/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.