When to plant brussels sprouts in Idaho

Plant out in Boise City

Apr 10–Apr 24

Across Idaho the window opens between March 23 and April 28. Find your city below; the dates follow each town's own average last frost.

Start indoors, Boise City: Feb 27–Mar 13
Plant out, Boise City: Apr 10–Apr 24
Fall planting, Boise City: Jul 1–Jul 15
Last frost, Boise City: Apr 24

Start seeds indoors 6–8 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 14–16 weeks before the first frost. Sprouts taste best after a few frosts. Plan the harvest for late fall.

Brussels sprouts planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost

JanFebMarAprMayJunJulAugSepOctNovDec

Boise CityApr 10–Apr 24

MeridianApr 10–Apr 24

NampaApr 15–Apr 29

CaldwellApr 15–Apr 29

Idaho FallsApr 25–May 9

PocatelloApr 18–May 2

Coeur d'AleneApr 8–Apr 22

Twin FallsApr 16–Apr 30

Post FallsApr 8–Apr 22

RexburgApr 28–May 12

LewistonMar 23–Apr 6

EagleApr 15–Apr 29

KunaApr 10–Apr 24

StarApr 15–Apr 29

AmmonApr 25–May 9

Questions

When should I plant brussels sprouts in Idaho?

In Boise City, plant out from April 10 to April 24. Across Idaho the window opens between March 23 and April 28, depending on the local last frost.

How is this date worked out?

Start seeds indoors 6–8 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 14–16 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Idaho

Brussels sprouts in other states

Frost dates for every city in Idaho