When to plant lettuce in Winnipeg
Lettuce is cold-hardy, so every date keys off Winnipeg's frost dates of May 25.
Step 1 · Sow
Start seeds indoors
Apr 27 – May 18
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 4 – May 25
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 18 – Jul 3
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Winnipeg's 118-day season leaves this much room.
Lettuce on Winnipeg'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 25
SEP 20
Common questions
When can I sow lettuce outdoors in Winnipeg?
Direct-sow around late April (Apr 27–May 18) in Winnipeg, based on its local frost dates. Confidence 72%.
When will lettuce be ready to harvest in Winnipeg?
Expect to harvest from around mid June (Jun 18–Jul 3) in Winnipeg, based on its local frost dates. Confidence 65%.
When should I start lettuce seeds indoors in Winnipeg?
Start seeds indoors around late April (Apr 27–May 18) in Winnipeg, based on its local frost dates. Confidence 68%.
When can I transplant lettuce outdoors in Winnipeg?
Transplant outdoors around early May (May 4–May 25) in Winnipeg, based on its local frost dates. Confidence 72%.
How long is the growing season in Winnipeg?
Winnipeg has roughly 118 frost-free days, which is enough time to grow lettuce to maturity outdoors.
The rule of thumb
Sow lettuce 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 Winnipeg's frost dates.
Confidence 72/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.