When to plant swiss chard in Marseille
Swiss chard is cold-hardy, so every date keys off Marseille's frost dates of Mar 15.
Step 1 · Sow
Start seeds indoors
Feb 15 – Mar 8
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 1 – Mar 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 20 – Apr 30
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Marseille's 261-day season leaves this much room.
Swiss chard on Marseille'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
MAR 15
DEC 1
Common questions
When can I sow swiss chard outdoors in Marseille?
Direct-sow around early March (Mar 1–Mar 22) in Marseille, based on its local frost dates. Confidence 84%.
When will swiss chard be ready to harvest in Marseille?
Expect to harvest from around mid April (Apr 20–Apr 30) in Marseille, based on its local frost dates. Confidence 76%.
When should I start swiss chard seeds indoors in Marseille?
Start seeds indoors around mid February (Feb 15–Mar 8) in Marseille, based on its local frost dates. Confidence 80%.
When can I transplant swiss chard outdoors in Marseille?
Transplant outdoors around early March (Mar 1–Mar 22) in Marseille, based on its local frost dates. Confidence 84%.
How long is the growing season in Marseille?
Marseille has roughly 261 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 Marseille's frost dates.
Confidence 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.