When to plant swiss chard in Boise

Swiss chard is cold-hardy, so every date keys off Boise's frost dates of May 2.
Step 1 · Sow
Start seeds indoors
Apr 4 – Apr 25
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 18 – May 9
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 7 – Jun 17
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 8 – Jul 22
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 3 – Sep 13
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Boise's 168-day season leaves this much room.
Swiss chard on Boise'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 2
OCT 17

Common questions

When can I sow swiss chard outdoors in Boise?

Direct-sow around mid April (Apr 18–May 9) in Boise, based on its local frost dates. Confidence 89%.

When will swiss chard be ready to harvest in Boise?

Expect to harvest from around early June (Jun 7–Jun 17) in Boise, based on its local frost dates. Confidence 80%.

When should I start swiss chard seeds indoors in Boise?

Start seeds indoors around early April (Apr 4–Apr 25) in Boise, based on its local frost dates. Confidence 85%.

When can I transplant swiss chard outdoors in Boise?

Transplant outdoors around mid April (Apr 18–May 9) in Boise, based on its local frost dates. Confidence 89%.

Can I plant swiss chard in autumn in Boise?

Yes — Boise supports a second, autumn sowing of swiss chard around early July (Jul 8–Jul 22), timed to mature before the first fall frost.

How long is the growing season in Boise?

Boise has roughly 168 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 Boise's frost dates.

Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.