When to plant leek in Sioux Falls
Leek is cold-hardy, so every date keys off Sioux Falls's frost dates of May 1.
Step 1 · Sow
Start seeds indoors
Feb 20 – Mar 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 17 – May 8
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 26 – Aug 15
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Sioux Falls's 153-day season leaves this much room.
Leek on Sioux Falls'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
MAY 1
OCT 2
Common questions
When will leek be ready to harvest in Sioux Falls?
Expect to harvest from around late July (Jul 26–Aug 15) in Sioux Falls, based on its local frost dates. Confidence 80%.
When should I start leek seeds indoors in Sioux Falls?
Start seeds indoors around mid February (Feb 20–Mar 13) in Sioux Falls, based on its local frost dates. Confidence 85%.
When can I transplant leek outdoors in Sioux Falls?
Transplant outdoors around mid April (Apr 17–May 8) in Sioux Falls, based on its local frost dates. Confidence 89%.
How long is the growing season in Sioux Falls?
Sioux Falls has roughly 153 frost-free days, which is enough time to grow leek to maturity outdoors.
The rule of thumb
Sow leek 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 Sioux Falls's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.