When to plant brussels sprouts in Montana

Brussels sprouts
Plant out in Billings
Apr 20–May 4

Across Montana the window opens between April 20 and May 30. Find your city below; the dates follow each town's own average last frost.

Start indoors, Billings
Mar 9–Mar 23
Plant out, Billings
Apr 20–May 4
Fall planting, Billings
Jun 17–Jul 1
Last frost, Billings
May 4

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
BillingsApr 20–May 4
MissoulaApr 26–May 10
Great FallsApr 22–May 6
BozemanMay 12–May 26
Butte-Silver BowMay 30–Jun 13
HelenaApr 25–May 9
KalispellMay 17–May 31

Questions

When should I plant brussels sprouts in Montana?

In Billings, plant out from April 20 to May 4. Across Montana the window opens between April 20 and May 30, 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 Montana

Brussels sprouts in other states

Frost dates for every city in Montana