When to plant swiss chard in Strasbourg
Swiss chard is cold-hardy, so every date keys off Strasbourg's frost dates of Apr 25.
Step 1 · Sow
Start seeds indoors
Mar 28 – Apr 18
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 11 – May 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 31 – Jun 10
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Strasbourg's 172-day season leaves this much room.
Swiss chard on Strasbourg'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
APR 25
OCT 14
Common questions
When can I sow swiss chard outdoors in Strasbourg?
Direct-sow around mid April (Apr 11–May 2) in Strasbourg, based on its local frost dates. Confidence 70%.
When will swiss chard be ready to harvest in Strasbourg?
Expect to harvest from around late May (May 31–Jun 10) in Strasbourg, based on its local frost dates. Confidence 63%.
When should I start swiss chard seeds indoors in Strasbourg?
Start seeds indoors around late March (Mar 28–Apr 18) in Strasbourg, based on its local frost dates. Confidence 67%.
When can I transplant swiss chard outdoors in Strasbourg?
Transplant outdoors around mid April (Apr 11–May 2) in Strasbourg, based on its local frost dates. Confidence 70%.
How long is the growing season in Strasbourg?
Strasbourg has roughly 172 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 Strasbourg's frost dates.
Confidence 70/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.