When to plant leeks in Montana

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: Feb 9–Feb 23
Plant out, Billings: Apr 20–May 4
Last frost, Billings: May 4

Start seeds indoors 10–12 weeks before the last frost; plant out up to 2 weeks before the last frost. Plant leeks deep in a trench and fill it in as they grow to get long white stems.

Leeks 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 leeks 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 10–12 weeks before the last frost; plant out up to 2 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Montana

Leeks in other states

Frost dates for every city in Montana