FrostCal

When to Plant Broccoli in Montana

In a typical Montana location, start seeds indoors Mar 26 – Apr 9, then transplant outdoors Apr 23 – Apr 30. Across the state, the outdoor planting window starts as early as Apr 14 in Laurel and as late as May 23 in Butte. For a fall crop, plant around Jul 27 – Aug 3.

Method Start indoors, then transplant
Days to maturity 55–80 days

Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost).

Broccoli Planting Dates by City

CityStart indoorsTransplantFall planting
BillingsMar 22 – Apr 5Apr 19 – Apr 26Jul 30 – Aug 6
MissoulaMar 22 – Apr 5Apr 19 – Apr 26Jul 30 – Aug 6
Great FallsMar 18 – Apr 1Apr 15 – Apr 22Jul 30 – Aug 6
BozemanApr 7 – Apr 21May 5 – May 12Jul 21 – Jul 28
ButteApr 25 – May 9May 23 – May 30Jul 4 – Jul 11
HelenaMar 21 – Apr 4Apr 18 – Apr 25Jul 29 – Aug 5
KalispellApr 12 – Apr 26May 10 – May 17Jul 9 – Jul 16
HavreMar 27 – Apr 10Apr 24 – May 1Jul 22 – Jul 29
AnacondaApr 13 – Apr 27May 11 – May 18Jul 13 – Jul 20
Miles CityMar 20 – Apr 3Apr 17 – Apr 24Jul 29 – Aug 5
Helena Valley SoutheastMar 21 – Apr 4Apr 18 – Apr 25Jul 29 – Aug 5
BelgradeApr 7 – Apr 21May 5 – May 12Jul 15 – Jul 22
Helena Valley West CentralMar 21 – Apr 4Apr 18 – Apr 25Jul 29 – Aug 5
EvergreenApr 12 – Apr 26May 10 – May 17Jul 9 – Jul 16
LivingstonApr 8 – Apr 22May 6 – May 13Jul 13 – Jul 20
WhitefishMar 28 – Apr 11Apr 25 – May 2Jul 24 – Jul 31
LaurelMar 17 – Mar 31Apr 14 – Apr 21Aug 1 – Aug 8
SidneyMar 23 – Apr 6Apr 20 – Apr 27Jul 26 – Aug 2
LockwoodMar 22 – Apr 5Apr 19 – Apr 26Jul 30 – Aug 6
LewistownMar 26 – Apr 9Apr 23 – Apr 30Jul 27 – Aug 3

Showing the 20 most populous of 20 Montana cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Montana cities.

Frequently Asked Questions

When should I plant broccoli in Montana?

In a typical Montana location, start seeds indoors Mar 26 – Apr 9, then transplant outdoors Apr 23 – Apr 30. Across the state, the outdoor planting window starts as early as Apr 14 in Laurel and as late as May 23 in Butte. For a fall crop, plant around Jul 27 – Aug 3.

When is the last frost in Montana?

The average last spring frost in Montana ranges from May 5 in Laurel to June 13 in Butte, based on NOAA 1991–2020 climate normals.

How long do broccoli take to grow?

Broccoli typically take 55–80 days from planting to harvest. Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost).

Other Crops in Montana

When to plant broccoli in other states

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