Cool-Season Vegetable

When to Plant Broccoli in South Dakota

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

The Short Answer

Broccoli are cold-tolerant and do well in South Dakota's varied climate. You can direct sow 4 weeks before your last frost — that's as early as May 10 - May 30 in Western South Dakota. South Dakota gardeners can also plant a fall crop. Prairie soils in east — excellent fertility. Thin, alkaline soils in Black Hills. Clay in some...

South Dakota Frost Dates

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

Region	Zones	Last Frost (Spring)	First Frost (Fall)
Western South Dakota	3b, 4a, 4b	May 10 - May 30	Sep 10 - Sep 25
Eastern South Dakota	4a, 4b, 5a	May 5 - May 20	Sep 20 - Oct 5

Broccoli Planting Schedule for South Dakota

Western South Dakota (Zones 3b, 4a, 4b)

Average last frost: May 10 - May 30 · 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

Eastern South Dakota (Zones 4a, 4b, 5a)

Average last frost: May 5 - May 20 · 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

Growing Broccoli in South Dakota

Broccoli in South Dakota's Climate

Broccoli thrives in your cool climate. Spring planting works well — transplant 2-3 weeks before last frost. Unlike warmer regions where heat causes premature bolting, your moderate summer temperatures often allow extended broccoli harvests. Fall broccoli is equally productive. Northern Michigan, Minnesota, and Wisconsin can even grow broccoli through summer in cooler years.

Soil Considerations for South Dakota

Prairie soils in east — excellent fertility. Thin, alkaline soils in Black Hills. Clay in some areas.

South Dakota Climate & Growing Season

Cold, windy climate. Short growing season. Warm summers with long days help compensate. Wind protection important. Broccoli can handle frost well, which is an advantage in South Dakota's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across South Dakota: Western South Dakota (3b, 4a, 4b) has a last frost around May 10 - May 30, while Eastern South Dakota (4a, 4b, 5a) sees frost end around May 5 - May 20. This difference matters for broccoli — but broccoli handle frost well, so the timing difference is less critical.

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 across South Dakota, but your exact planting dates depend on which region you're in. Western South Dakota gardeners should plan around a May 10 - May 30 last frost, while those in Eastern South Dakota can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

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