When to plant swiss chard in Lyon
Swiss chard is cold-hardy, so every date keys off Lyon's frost dates of Apr 15.
Step 1 · Sow
Start seeds indoors
Mar 18 – Apr 8
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 1 – Apr 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 21 – May 31
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Lyon's 193-day season leaves this much room.
Swiss chard on Lyon'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 15
OCT 25
Common questions
When can I sow swiss chard outdoors in Lyon?
Direct-sow around early April (Apr 1–Apr 22) in Lyon, based on its local frost dates. Confidence 86%.
When will swiss chard be ready to harvest in Lyon?
Expect to harvest from around late May (May 21–May 31) in Lyon, based on its local frost dates. Confidence 77%.
When should I start swiss chard seeds indoors in Lyon?
Start seeds indoors around mid March (Mar 18–Apr 8) in Lyon, based on its local frost dates. Confidence 82%.
When can I transplant swiss chard outdoors in Lyon?
Transplant outdoors around early April (Apr 1–Apr 22) in Lyon, based on its local frost dates. Confidence 86%.
How long is the growing season in Lyon?
Lyon has roughly 193 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 Lyon's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.