Wyoming Planting Calendar

Frost dates, growing zones, and planting dates for Wyoming gardeners.

Zone 3a Zone 3b Zone 4a Zone 4b Zone 5a Zone 5b

The Short Answer

Wyoming spans USDA zones 3a through 5b, which means planting dates vary significantly across the state. Eastern Wyoming has an average last frost around May 10 - May 30, while Southern Wyoming sees its last frost around May 15 - Jun 1. Use our homepage tool with your zip code for dates specific to your exact location.

Wyoming Frost Dates by Region

Short growing season. Very windy — wind protection essential for gardens. Low humidity. Cool nights even in summer at elevation.

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

Soil & Growing Conditions

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

What to Plant in Wyoming

Wyoming's short growing season rewards strategic planning. Cold-hardy crops are your strength, and warm-season crops need indoor starting. These are the best performers for Wyoming's climate:

Top Picks for Wyoming

Kale Garlic Potatoes Peas Carrots Lettuce Broccoli Beets Radishes Spinach Beans (Green/Snap)Cabbage Daffodils

Worth the Effort

With indoor starting and season extension, Wyoming gardeners also grow excellent tomatoes, peppers, cucumbers, and sunflowers. The long summer daylight hours drive faster growth than you'd expect:

Tomatoes Peppers Cucumbers Squash (Summer)Basil Sunflowers Zinnias Corn (Sweet)

Browse all 100 plants — or enter your zip code for personalized planting dates.

Neighboring States

Gardeners near state borders may find useful information in neighboring state guides:

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin

Note: Frost dates are based on NOAA 30-year Climate Normals and represent historical averages. Actual frost dates can vary significantly year to year. Zone data is from the USDA Plant Hardiness Zone Map.

Last reviewed: March 29, 2026