When to plant potato in Missoula
Potato is cold-hardy, so every date keys off Missoula's frost dates of May 15.
Step 1 · Sow
Direct sow outdoors
May 1 – May 22
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jul 10 – Aug 29
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
Missoula's 138-day season leaves this much room.
Potato on Missoula'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
MAY 15
OCT 4
Common questions
When can I sow potato outdoors in Missoula?
Direct-sow around early May (May 1–May 22) in Missoula, based on its local frost dates. Confidence 83%.
When will potato be ready to harvest in Missoula?
Expect to harvest from around early July (Jul 10–Aug 29) in Missoula, based on its local frost dates. Confidence 75%.
How long is the growing season in Missoula?
Missoula has roughly 138 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 Missoula's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.