When to plant potato in Seattle
Potato is cold-hardy, so every date keys off Seattle's frost dates of Mar 17.
Step 1 · Sow
Direct sow outdoors
Mar 3 – Mar 24
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 12 – Jul 1
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
Seattle's 237-day season leaves this much room.
Potato on Seattle'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
FROST
HARVEST
MAR 17
NOV 13
Common questions
When can I sow potato outdoors in Seattle?
Direct-sow around early March (Mar 3–Mar 24) in Seattle, based on its local frost dates. Confidence 83%.
When will potato be ready to harvest in Seattle?
Expect to harvest from around mid May (May 12–Jul 1) in Seattle, based on its local frost dates. Confidence 75%.
How long is the growing season in Seattle?
Seattle has roughly 237 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 Seattle's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.