Cool-Season Vegetable

When to Plant Broccoli in Michigan

A nutrition powerhouse that thrives in cool weather. Harvest the main head, then enjoy weeks of side shoots.

The Short Answer

Michigan's cool climate is actually broccoli's sweet spot. The state's moderate summers — especially in the northern half — can support broccoli production through a longer window than most of the Midwest. Fall broccoli in Michigan is particularly rewarding: the gradually cooling temperatures produce sweet, dense heads, and the crop can continue producing side shoots well into October.

Michigan Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Upper Peninsula 4a, 4b, 5a May 15 - Jun 5 Sep 10 - Sep 25
Northern Lower Michigan 5a, 5b May 10 - May 25 Sep 20 - Oct 5
Southern Michigan 5b, 6a, 6b Apr 25 - May 10 Oct 1 - Oct 15

Broccoli Planting Schedule for Michigan

Upper Peninsula (Zones 4a, 4b, 5a)

Average last frost: May 15 - Jun 5 · Average first frost: Sep 10 - Sep 25

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

Northern Lower Michigan (Zones 5a, 5b)

Average last frost: May 10 - May 25 · Average first frost: Sep 20 - Oct 5

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

Southern Michigan (Zones 5b, 6a, 6b)

Average last frost: Apr 25 - May 10 · Average first frost: Oct 1 - Oct 15

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

Growing Broccoli in Michigan

State-Specific Growing Tips

Spring: start seeds indoors in early April, transplant in late April to early May. Broccoli handles light frost. Summer: northern Michigan's cool conditions can support summer broccoli production — unusual for anywhere south of Canada. Fall: start seeds indoors in late June, transplant in late July for September-October harvest. Michigan's sandy western soils need compost for moisture retention. Southeast Michigan's clay works fine for broccoli with standard amendment.

Recommended Varieties for Michigan

Green Comet for spring. Marathon and Belstar for fall. DeCicco for extended side-shoot production. In northern Michigan, try direct-sowing in July for a fall crop — the cool summers make this approach more viable than in southern regions. MSU Extension provides brassica variety trial data.

Common Challenges in Michigan

Cabbage worms — use Bt or floating row cover. Clubroot in acidic soils — add lime if pH is below 6.5. Flea beetles on young transplants. Aphids inside developing heads — a particular nuisance at harvest. In southern Michigan, summer heat can cause buttoning (small, premature heads) in spring plantings.

Growing Tips

Harvest main head while buds are tight. Side shoots will continue producing for weeks after the main harvest.

Companion Planting

Plant broccoli alongside these companions for better growth:

Beets Celery Onions Potatoes

Keep broccoli away from:

Tomatoes Peppers Strawberries

The Bottom Line

Broccoli can be grown successfully in Michigan with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Upper Peninsula gardeners work with a last frost around May 15 - Jun 5, while Southern Michigan sees frost end around Apr 25 - May 10. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Broccoli Growing Guide National planting guide with all states Michigan Planting Calendar All plants for Michigan Broccoli in Alabama Alabama planting dates Broccoli in Alaska Alaska planting dates Broccoli in Arizona Arizona planting dates Broccoli 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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