When to plant carrot in Boise
Carrot is cold-hardy, so every date keys off Boise's frost dates of May 2.
Step 1 · Sow
Direct sow outdoors
Apr 11 – May 2
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jun 10 – Jun 30
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jun 18 – Jul 2
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Aug 24 – Sep 13
Maturity window for the second sowing.
Window
Days to maturity
60 – 80 d
Boise's 168-day season leaves this much room.
Carrot 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
FROST
FROST
MAY 2
OCT 17
Common questions
When can I sow carrot outdoors in Boise?
Direct-sow around mid April (Apr 11–May 2) in Boise, based on its local frost dates. Confidence 89%.
When will carrot be ready to harvest in Boise?
Expect to harvest from around early June (Jun 10–Jun 30) in Boise, based on its local frost dates. Confidence 80%.
Can I plant carrot in autumn in Boise?
Yes — Boise supports a second, autumn sowing of carrot around mid June (Jun 18–Jul 2), 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 carrot to maturity outdoors.
The rule of thumb
Sow carrot 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.