When to plant potato in San Jose
Potato is cold-hardy, so every date keys off San Jose's frost dates of Feb 12.
Step 1 · Sow
Direct sow outdoors
Dec 25 – Jan 15
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Mar 5 – Apr 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
San Jose's 294-day season leaves this much room.
Potato 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
HARVEST
FEB 12
DEC 3
Common questions
When can I sow potato outdoors in San Jose?
Direct-sow around late December (Dec 25–Jan 15) in San Jose, based on its local frost dates. Confidence 80%.
When will potato be ready to harvest in San Jose?
Expect to harvest from around early March (Mar 5–Apr 24) in San Jose, based on its local frost dates. Confidence 74%.
How long is the growing season in San Jose?
San Jose has roughly 294 frost-free days, which is enough time to grow potato to maturity outdoors.
The rule of thumb
Sow potato 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.