Planting zones by state

Wyoming Planting Zones

Wyoming runs from zone 4a to zone 5b on the 2023 USDA map. Zone 5a is the most common, covering 57% of the state's ZIP codes. Cheyenne is 5b, Casper is 5a and Jackson is 4b.

Zones across Wyoming

ZoneAverage coldest nightShare of Wyoming ZIP codes
4a−30 to −25°F5%
4b−25 to −20°F23%
5a−20 to −15°F57%
5b−15 to −10°F15%

Planting zone for every city and town in Wyoming

Each Wyoming town uses the ZIP code at its center. Big towns can cross into the next half-zone, so look up your own ZIP if you're near a line.

CityZoneAverage coldest night
Afton5b−15 to −10°F
Albin5b−15 to −10°F
Alpine5b−15 to −10°F
Baggs4b−25 to −20°F
Bairoil5b−15 to −10°F
Bar Nunn5a−20 to −15°F
Basin4b−25 to −20°F
Bear River5b−15 to −10°F
Big Piney4a−30 to −25°F
Buffalo5a−20 to −15°F
Burlington5a−20 to −15°F
Burns5a−20 to −15°F
Byron5a−20 to −15°F
Casper5a−20 to −15°F
Cheyenne5b−15 to −10°F
Chugwater5a−20 to −15°F
Clearmont5a−20 to −15°F
Cody5a−20 to −15°F
Cokeville4a−30 to −25°F
Cowley5a−20 to −15°F
Dayton5a−20 to −15°F
Deaver5a−20 to −15°F
Diamondville4b−25 to −20°F
Dixon4b−25 to −20°F
Douglas5a−20 to −15°F
Dubois4b−25 to −20°F
East Thermopolis4b−25 to −20°F
Edgerton5a−20 to −15°F
Elk Mountain5a−20 to −15°F
Encampment5a−20 to −15°F
Evanston5a−20 to −15°F
Evansville5a−20 to −15°F
Fort Laramie5a−20 to −15°F
Frannie5a−20 to −15°F
Gillette4b−25 to −20°F
Glendo5a−20 to −15°F
Glenrock5a−20 to −15°F
Granger4b−25 to −20°F
Green River5a−20 to −15°F
Greybull4b−25 to −20°F
Guernsey5a−20 to −15°F
Hanna5a−20 to −15°F
Hartville5a−20 to −15°F
Hudson5a−20 to −15°F
Hulett5a−20 to −15°F
Jackson4b−25 to −20°F
Kaycee5a−20 to −15°F
Kemmerer4b−25 to −20°F
Kirby4b−25 to −20°F
La Barge4a−30 to −25°F
LaGrange5a−20 to −15°F
Lander5a−20 to −15°F
Laramie5b−15 to −10°F
Lingle5a−20 to −15°F
Lost Springs5a−20 to −15°F
Lovell5a−20 to −15°F
Lusk5a−20 to −15°F
Lyman5a−20 to −15°F
Manderson4b−25 to −20°F
Manville5a−20 to −15°F
Marbleton4a−30 to −25°F
Medicine Bow4a−30 to −25°F
Meeteetse4b−25 to −20°F
Midwest5a−20 to −15°F
Mills5a−20 to −15°F
Moorcroft4b−25 to −20°F
Mountain View5b−15 to −10°F
Newcastle4b−25 to −20°F
Opal4b−25 to −20°F
Pavillion5a−20 to −15°F
Pine Bluffs5a−20 to −15°F
Pine Haven4b−25 to −20°F
Pinedale4b−25 to −20°F
Powell5a−20 to −15°F
Ranchester5a−20 to −15°F
Rawlins5a−20 to −15°F
Riverside5a−20 to −15°F
Riverton5a−20 to −15°F
Rock River4b−25 to −20°F
Rock Springs5a−20 to −15°F
Rolling Hills5a−20 to −15°F
Saratoga5a−20 to −15°F
Sheridan5a−20 to −15°F
Shoshoni4b−25 to −20°F
Sinclair5a−20 to −15°F
Star Valley Ranch5b−15 to −10°F
Sundance4b−25 to −20°F
Superior5a−20 to −15°F
Ten Sleep5a−20 to −15°F
Thayne5b−15 to −10°F
Thermopolis4b−25 to −20°F
Torrington5a−20 to −15°F
Upton4b−25 to −20°F
Van Tassell5a−20 to −15°F
Wamsutter4b−25 to −20°F
Wheatland5a−20 to −15°F
Worland4b−25 to −20°F
Wright5a−20 to −15°F
Yoder5a−20 to −15°F

Source: USDA Plant Hardiness Zone Map, 2023, Agricultural Research Service, U.S. Department of Agriculture; ZIP code table from the PRISM Group, Oregon State University (accessed Oct 2026). This list is our own summary, not the official USDA map. See how we calculate.

Frequently asked questions

What planting zone is Wyoming?

Wyoming spans zones 4a to 5b on the 2023 USDA map, and zone 5a is the most common. Look up your ZIP code for your exact zone.

What zone is Cheyenne, WY?

Cheyenne is zone 5b, where the coldest night of an average winter falls from −15 to −10°F. Plants rated hardy to zone 5 or colder should survive a typical winter there.

More for Wyoming: Wyoming climate zones (insulation) · Last frost dates in Wyoming · Frost line depth by state