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Wyoming Planting Zones

Wyoming covers USDA hardiness zones 4a to 5b on the 2023 map. The most common zone is 5a (58% of ZIP codes), where the coldest winter night averages -20 to -15 °F. Cheyenne is zone 5b, Casper is zone 5a and Gillette is zone 5a.

Zones in Wyoming

Share of the state’s ZIP codes in each zone.

4a 5% -30 to -25 °F
4b 22% -25 to -20 °F
5a 58% -20 to -15 °F
5b 15% -15 to -10 °F

Major cities

Cheyenne 5b
Casper 5a
Gillette 5a
Laramie 4a–5b
Evanston 5a
Jackson 4b
Rock Springs 5a–5b
Afton 5b
Aladdin 5a
Albin 5b
Alcova 5a
Alpine 5b

Every city and town in Wyoming

Afton 83110 5b
Aladdin 82710 5a
Albin 82050 5b
Alcova 82620 5a
Alpine 83128 5b
Alta 83414 5a
Alva 82711 5a
Arapahoe 82510 5a
Arminto 82630 5a
Arvada 82831 4b
Auburn 83111 4b
Baggs 82321 4b
Bairoil 82322 5b
Banner 82832 5a
Basin 82410 4b
Bedford 83112 5b
Beulah 82712 5a
Big Horn 82833 5a
Big Piney 83113 4a
Bondurant 82922 4b
Bosler 82051 4a
Boulder 82923 4a
Buffalo 82834 5a
Buford 82052 5b
Burlington 82411 5a
Burns 82053 5a
Byron 82412 5a
Carpenter 82054 5b
Casper 82601+ 5a
Centennial 82055 5a
Cheyenne 82001+ 5b
Chugwater 82210 5a
Clearmont 82835 5a
Cody 82414 5a
Cokeville 83114 4a
Cora 82925 4b
Cowley 82420 5a
Crowheart 82512 5a
Daniel 83115 4a
Dayton 82836 4b
Deaver 82421 5a
Devils Tower 82714 4b
Diamondville 83116 4b
Dixon 82323 4b
Douglas 82633 5a
Dubois 82513 4b
Edgerton 82635 5a
Elk Mountain 82324 5a
Emblem 82422 5a
Encampment 82325 5a
Etna 83118 5b
Evanston 82930+ 5a
Evansville 82636 5a
Fairview 83119 5a
Farson 82932 4a
Fe Warren Afb 82005 5b
Fort Bridger 82933 5b
Fort Laramie 82212 5a
Fort Washakie 82514 5a
Frannie 82423 5a
Freedom 83120 5a
Frontier 83121 4b
Garrett 82058 5a
Gillette 82716+ 5a
Glendo 82213 5a
Glenrock 82637 5a
Granger 82934 4b
Granite Canon 82059 5b
Green River 82935 5a
Greybull 82426 4b
Grover 83122 4b
Guernsey 82214 5a
Hanna 82327 5a
Hartville 82215 5a
Hawk Springs 82217 5a
Hiland 82638 5a
Hillsdale 82060 5a
Horse Creek 82061 5b
Hudson 82515 5a
Hulett 82720 4b
Huntley 82218 5a
Hyattville 82428 5a
Jackson 83001+ 4b
Jay Em 82219 5a
Jeffrey City 82310 4b
Jelm 82063 5a
Kaycee 82639 5a
Kelly 83011 5a
Kemmerer 83101 5a
Kinnear 82516 5a
Kirby 82430 4b
La Barge 83123 4a
Lagrange 82221 5a
Lance Creek 82222 4b
Lander 82520 5a
Laramie 82070+ 4a–5b
Leiter 82837 4b
Linch 82640 5a
Lingle 82223 5a
Little America 82929 5a
Lonetree 82936 5b
Lost Springs 82224 5a
Lovell 82431 5a
Lusk 82225 5a
Lyman 82937 5a
Lysite 82642 5a
Manderson 82432 4b
Manville 82227 5a
Mc Kinnon 82938 5b
Medicine Bow 82329 4a
Meeteetse 82433 4b
Meriden 82081 5a
Midwest 82643 5a
Mills 82644 5a
Moorcroft 82721 4b
Moose 83012 4a
Moran 83013 5a
Mountain View 82939 5b
Natrona 82646 5a
Newcastle 82701 4b
Opal 83124 4b
Osage 82723 4b
Otto 82434 4b
Parkman 82838 5a
Pavillion 82523 5a
Pine Bluffs 82082 5a
Pinedale 82941 4b
Point Of Rocks 82942 5a
Powder River 82648 5a
Powell 82435 5a
Ralston 82440 5a
Ranchester 82839 5a
Rawlins 82301 5a
Recluse 82725 5a
Reliance 82943 5a
Riverton 82501 5a
Robertson 82944 5a
Rock River 82083 4b
Rock Springs 82901+ 5a–5b
Rozet 82727 4b
Saddlestring 82840 5a
Saint Stephens 82524 4b
Saratoga 82331 5a
Savery 82332 5b
Shawnee 82229 5a
Shell 82441 5a
Sheridan 82801 5a
Shirley Basin 82615 4b
Shoshoni 82649 4b
Sinclair 82334 5a
Smoot 83126 5a
Story 82842 5a
Sundance 82729 4b
Superior 82945 5a
Ten Sleep 82442 5a
Teton Village 83025 4b
Thayne 83127 5b
Thermopolis 82443 5a
Tie Siding 82084 5b
Torrington 82240 5a
Upton 82730 4b
Van Tassell 82242 5a
Veteran 82243 5a
Walcott 82335 5a
Wamsutter 82336 4b
Wapiti 82450 5a
Weston 82731 4b
Wheatland 82201 5a
Wilson 83014 5b
Wolf 82844 5a
Worland 82401 4b
Wright 82732 5a
Wyarno 82845 5a
Yellowstone National Park 82190 4b
Yoder 82244 5a

Other states

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia 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 Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin

Zones: 2023 USDA Plant Hardiness Zone Map ZIP code data, USDA Agricultural Research Service and the PRISM Climate Group, Oregon State University (official map). Place names: GeoNames (CC BY 4.0). Each ZIP code gets one zone, but a ZIP code can cross a zone line, and hills, valleys and towns can be warmer or colder than the zone shown.

About the Hardiness Zone Map

The Hardiness Zone Map finds your USDA plant hardiness zone, also called your planting or growing zone, from your ZIP code. Zones are based on the average coldest winter night of the year: each zone is 10 °F wide and split into a and b halves of 5 °F, from zone 1a in Alaska to 13b in Puerto Rico. Plant labels and seed packets give the coldest zone a plant can survive, so knowing your zone tells you which perennials, shrubs and trees can stay outside all winter. Zones come from the official 2023 USDA map ZIP code data for all 50 states, Washington DC and Puerto Rico.

How to use it

1 Enter your 5-digit ZIP code and press Find my zone.
2 Read your zone and the average coldest winter temperature it stands for.
3 Open your state to see its zones and the zone of every city.
4 Choose plants rated for your zone number or a colder (lower) one.

Frequently asked questions

What growing zone is Wyoming?

Wyoming spans zones 4a–5b. Zone 5a is the most common, covering 58% of the state's ZIP codes. Enter your ZIP code above for your exact zone.

What planting zone is Cheyenne, WY?

Cheyenne is in USDA zone 5b. Its average coldest winter night is -15 to -10 °F.

What planting zone is Casper, WY?

Casper is in USDA zone 5a. Its average coldest winter night is -20 to -15 °F.

What planting zone is Gillette, WY?

Gillette is in USDA zone 5a. Its average coldest winter night is -20 to -15 °F.

What is the coldest zone in Wyoming?

The coldest part of Wyoming is zone 4a, with winter lows of -30 to -25 °F. The warmest is zone 5b, at -15 to -10 °F.

How are planting zones worked out?

Each zone is a 10 °F band of the average coldest winter night over 1991–2020, split into a and b halves of 5 °F. The map does not show summer heat, rainfall or frost dates, so check local advice before planting.

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