Cool-Season Vegetable

When to Plant Broccoli in Wyoming

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 Wyoming's humid climate. You can direct sow 4 weeks before your last frost — that's as early as May 10 - May 30 in Eastern Wyoming. Wyoming gardeners can also plant a fall crop. Alkaline, thin soils. Dry climate means little organic matter naturally. Wind erosion a significant...

Wyoming Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Eastern Wyoming 4a, 4b, 5a May 10 - May 30 Sep 10 - Sep 25
Western Wyoming 3a, 3b, 4a May 25 - Jun 15 Aug 25 - Sep 15
Southern Wyoming 4b, 5a, 5b May 15 - Jun 1 Sep 5 - Sep 20

Broccoli Planting Schedule for Wyoming

Eastern Wyoming (Zones 4a, 4b, 5a)

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

Western Wyoming (Zones 3a, 3b, 4a)

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

Southern Wyoming (Zones 4b, 5a, 5b)

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
Direct Sow
4 wks before frost
Fall Planting
10 wks before first frost

Growing Broccoli in Wyoming

Broccoli in Wyoming'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 Wyoming

Alkaline, thin soils. Dry climate means little organic matter naturally. Wind erosion a significant challenge. Heavy amendment needed.

Wyoming Climate & Growing Season

Short growing season. Very windy — wind protection essential for gardens. Low humidity. Cool nights even in summer at elevation. Broccoli can handle frost well, which is an advantage in Wyoming's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Wyoming: Eastern Wyoming (4a, 4b, 5a) has a last frost around May 10 - May 30, while Southern Wyoming (4b, 5a, 5b) sees frost end around May 15 - Jun 1. 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 Wyoming, but your exact planting dates depend on which region you're in. Eastern Wyoming gardeners should plan around a May 10 - May 30 last frost, while those in Southern Wyoming can typically plant later. 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 Wyoming Planting Calendar All plants for Wyoming 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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