When to plant swiss chard in Winnipeg

Swiss chard is cold-hardy, so every date keys off Winnipeg's frost dates of May 8.
Step 1 · Sow
Start seeds indoors
Apr 10 – May 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 30 – May 21
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 19 – Jun 29
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 9 – Jul 23
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 4 – Sep 14
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Winnipeg's 154-day season leaves this much room.
Swiss chard 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
MAY 8
OCT 10

Common questions

When can I sow swiss chard outdoors in Winnipeg?

Direct-sow around late April (Apr 30–May 21) in Winnipeg, based on its local frost dates. Confidence 81%.

When will swiss chard be ready to harvest in Winnipeg?

Expect to harvest from around mid June (Jun 19–Jun 29) in Winnipeg, based on its local frost dates. Confidence 76%.

When should I start swiss chard seeds indoors in Winnipeg?

Start seeds indoors around early April (Apr 10–May 1) in Winnipeg, based on its local frost dates. Confidence 80%.

When can I transplant swiss chard outdoors in Winnipeg?

Transplant outdoors around late April (Apr 30–May 21) in Winnipeg, based on its local frost dates. Confidence 81%.

Can I plant swiss chard in autumn in Winnipeg?

Yes — Winnipeg supports a second, autumn sowing of swiss chard around early July (Jul 9–Jul 23), timed to mature before the first fall frost.

How long is the growing season in Winnipeg?

Winnipeg has roughly 154 frost-free days, which is enough time to grow swiss chard to maturity outdoors.

The rule of thumb

Sow swiss chard 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 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.