FrostCal

When to Plant Broccoli in Idaho

In a typical Idaho location, start seeds indoors Mar 12 – Mar 26, then transplant outdoors Apr 9 – Apr 16. Across the state, the outdoor planting window starts as early as Mar 16 in Lewiston and as late as Apr 26 in Eagle. For a fall crop, plant around Aug 12 – Aug 19. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

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
BoiseMar 6 – Mar 20Apr 3 – Apr 10Aug 19 – Aug 26
MeridianMar 6 – Mar 20Apr 3 – Apr 10Aug 19 – Aug 26
NampaMar 11 – Mar 25Apr 8 – Apr 15Aug 11 – Aug 18
Idaho FallsMar 21 – Apr 4Apr 18 – Apr 25Jul 30 – Aug 6
PocatelloMar 14 – Mar 28Apr 11 – Apr 18Aug 9 – Aug 16
CaldwellMar 5 – Mar 19Apr 2 – Apr 9Aug 16 – Aug 23
Coeur d'AleneMar 4 – Mar 18Apr 1 – Apr 8Aug 16 – Aug 23
Twin FallsMar 12 – Mar 26Apr 9 – Apr 16Aug 7 – Aug 14
LewistonFeb 16 – Mar 2Mar 16 – Mar 23Aug 24 – Aug 31
Lewiston OrchardsFeb 16 – Mar 2Mar 16 – Mar 23Aug 24 – Aug 31
Post FallsMar 4 – Mar 18Apr 1 – Apr 8Aug 16 – Aug 23
RexburgMar 27 – Apr 10Apr 24 – May 1Jul 22 – Jul 29
MoscowFrost-free: year-round planting
EagleMar 29 – Apr 12Apr 26 – May 3Aug 10 – Aug 17
CondaFrost-free: year-round planting
KunaMar 6 – Mar 20Apr 3 – Apr 10Aug 19 – Aug 26
AmmonMar 21 – Apr 4Apr 18 – Apr 25Jul 30 – Aug 6
ChubbuckMar 14 – Mar 28Apr 11 – Apr 18Aug 9 – Aug 16
HaydenMar 4 – Mar 18Apr 1 – Apr 8Aug 16 – Aug 23
Mountain HomeMar 14 – Mar 28Apr 11 – Apr 18Aug 6 – Aug 13
BlackfootMar 17 – Mar 31Apr 14 – Apr 21Aug 1 – Aug 8
Garden CityMar 6 – Mar 20Apr 3 – Apr 10Aug 19 – Aug 26
JeromeMar 14 – Mar 28Apr 11 – Apr 18Aug 12 – Aug 19
BurleyMar 19 – Apr 2Apr 16 – Apr 23Aug 2 – Aug 9

Showing the 24 most populous of 24 Idaho cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Idaho cities.

Frequently Asked Questions

When should I plant broccoli in Idaho?

In a typical Idaho location, start seeds indoors Mar 12 – Mar 26, then transplant outdoors Apr 9 – Apr 16. Across the state, the outdoor planting window starts as early as Mar 16 in Lewiston and as late as Apr 26 in Eagle. For a fall crop, plant around Aug 12 – Aug 19. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

When is the last frost in Idaho?

The average last spring frost in Idaho ranges from April 6 in Lewiston to May 17 in Eagle, 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 Idaho

When to plant broccoli in other states

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