Cool-Season Vegetable

When to Plant Cauliflower in Minnesota

The diva of the brassica family. More temperamental than broccoli but worth the extra attention.

The Short Answer

Cauliflower are cold-tolerant and do well in Minnesota's varied climate. Minnesota gardeners can also plant a fall crop. Rich prairie soils in south and west. Rocky and thin soils in north. Generally excellent for...

Minnesota Frost Dates

Your planting dates depend on which part of Minnesota you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Minnesota 3a, 3b May 15 - Jun 1 Sep 5 - Sep 20
Central Minnesota 3b, 4a May 5 - May 20 Sep 15 - Oct 1
Southern Minnesota 4a, 4b Apr 25 - May 10 Sep 25 - Oct 10

Cauliflower Planting Schedule for Minnesota

Northern Minnesota (Zones 3a, 3b)

Average last frost: May 15 - Jun 1 · Average first frost: Sep 5 - Sep 20

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks before frost
Fall Planting
10 wks before first frost

Central Minnesota (Zones 3b, 4a)

Average last frost: May 5 - May 20 · Average first frost: Sep 15 - Oct 1

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks before frost
Fall Planting
10 wks before first frost

Southern Minnesota (Zones 4a, 4b)

Average last frost: Apr 25 - May 10 · Average first frost: Sep 25 - Oct 10

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks before frost
Fall Planting
10 wks before first frost

Growing Cauliflower in Minnesota

Cauliflower in Minnesota's Climate

Cauliflower is more demanding than broccoli — it needs steady 60-70°F temperatures during heading, which your unpredictable spring weather may not provide. Fall is the better season: start indoors in mid-June, transplant in mid-July, and let the gradual autumn cool-down produce tight, clean heads. Temperature swings cause buttoning (premature tiny heads).

Soil Considerations for Minnesota

Rich prairie soils in south and west. Rocky and thin soils in north. Generally excellent for gardening in southern half.

Minnesota Climate & Growing Season

Long, cold winters. Warm summers. Short but productive growing season with long summer days. Hardy varieties essential.

Growing season length varies across Minnesota: Northern Minnesota (3a, 3b) has a last frost around May 15 - Jun 1, while Southern Minnesota (4a, 4b) sees frost end around Apr 25 - May 10. This difference matters for cauliflower — adjust your planting dates to match your specific region.

Growing Tips

Blanch white varieties by tying outer leaves over the head when it reaches 2 inches. Temperature swings cause buttoning.

Companion Planting

Plant cauliflower alongside these companions for better growth:

Beets Celery Onions

Keep cauliflower away from:

Strawberries Tomatoes

The Bottom Line

Cauliflower can be grown successfully across Minnesota, but your exact planting dates depend on which region you're in. Northern Minnesota gardeners should plan around a May 15 - Jun 1 last frost, while those in Southern Minnesota can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Cauliflower Growing Guide National planting guide with all states Minnesota Planting Calendar All plants for Minnesota Cauliflower in Alabama Alabama planting dates Cauliflower in Alaska Alaska planting dates Cauliflower in Arizona Arizona planting dates Cauliflower in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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