When to plant potato in Tokyo
Potato is cold-hardy, so every date keys off Tokyo's frost dates of Mar 25.
Step 1 · Sow
Direct sow outdoors
Mar 11 – Apr 1
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 20 – Jul 9
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
Tokyo's 255-day season leaves this much room.
Potato on Tokyo'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
MAR 25
DEC 5
Common questions
When can I sow potato outdoors in Tokyo?
Direct-sow around mid March (Mar 11–Apr 1) in Tokyo, based on its local frost dates. Confidence 88%.
When will potato be ready to harvest in Tokyo?
Expect to harvest from around mid May (May 20–Jul 9) in Tokyo, based on its local frost dates. Confidence 79%.
How long is the growing season in Tokyo?
Tokyo has roughly 255 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 Tokyo's frost dates.
Confidence 88/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.