FrostCal

When to Plant Cauliflower in Idaho

In a typical Idaho location, start seeds indoors Mar 12 – Mar 26, then transplant outdoors Apr 16 – Apr 23. Across the state, the outdoor planting window starts as early as Mar 23 in Lewiston and as late as May 3 in Eagle. For a fall crop, plant around Aug 5 – Aug 12. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

Method Start indoors, then transplant
Days to maturity 55–85 days

Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.

Cauliflower Planting Dates by City

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

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 cauliflower in Idaho?

In a typical Idaho location, start seeds indoors Mar 12 – Mar 26, then transplant outdoors Apr 16 – Apr 23. Across the state, the outdoor planting window starts as early as Mar 23 in Lewiston and as late as May 3 in Eagle. For a fall crop, plant around Aug 5 – Aug 12. 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 cauliflower take to grow?

Cauliflower typically take 55–85 days from planting to harvest. Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.

Other Crops in Idaho

When to plant cauliflower in other states

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