When to plant potato in St. Louis
Potato is cold-hardy, so every date keys off St. Louis's frost dates of Mar 30.
Step 1 · Sow
Direct sow outdoors
Mar 17 – Apr 7
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 26 – Jul 15
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 120 d
St. Louis's 218-day season leaves this much room.
Potato on St. Louis'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 30
NOV 5
Common questions
When can I sow potato outdoors in St. Louis?
Direct-sow around mid March (Mar 17–Apr 7) in St. Louis, based on its local frost dates. Confidence 81%.
When will potato be ready to harvest in St. Louis?
Expect to harvest from around late May (May 26–Jul 15) in St. Louis, based on its local frost dates. Confidence 76%.
How long is the growing season in St. Louis?
St. Louis has roughly 218 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 St. Louis's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.