Wyoming has 6 USDA hardiness zones from 3b to 6a, with average winter lows from -35°F in Sublette and Teton Counties’ high valleys to -5°F in Sweetwater and Uinta Counties, per the 2023 USDA Plant Hardiness Zone Map.
Wyoming’s coldest zones 3b–4a appear in high mountain valleys of western Sublette, Teton, and Lincoln Counties with -35°F to -25°F lows: Pinedale at zone 4a, Boulder at zones 3b–4a, La Barge at zone 3b, and Big Piney at zone 4a.
Central and eastern plains span zones 4b–5b: Casper at zone 5a in Natrona County, Cheyenne at zones 5a–5b in Laramie County, Sheridan at zones 4b–5a, Cody at zones 5a–5b, Gillette at zone 5a, and Laramie at zones 4a–4b in Albany County.
Southwestern Sweetwater, Uinta, and Lincoln Counties hold the warmest zone 6a with -10°F to -5°F lows. Green River reaches zones 5a–6a in Sweetwater County, and Wilson and Hoback at zones 4b–6a in Teton County mark warm sheltered pockets.
Wyoming’s hardiness zones are also called growing zones, planting zones, plant zones, gardening zones, USDA zones, or climate zones.
Use the county and city lists below, search by ZIP code, or open the interactive Wyoming planting zones map for precise USDA zone locations.
Wyoming Planting Zones by ZIP Code
Wyoming Planting Zones Map
Planting Zones
Planting Zones
USDA Hardiness Zones for Wyoming Counties
| Wyoming Counties | USDA Hardiness Zones (2023) |
|---|---|
| Albany County | Zone 3b, 4a, 4b, 5a and 5b |
| Big Horn County | Zone 3b, 4a, 4b, 5a and 5b |
| Campbell County | Zone 4b, 5a, 5b and 6a |
| Carbon County | Zone 4a, 4b, 5a, 5b and 6a |
| Converse County | Zone 4a, 4b, 5a and 5b |
| Crook County | Zone 4a, 4b, 5a and 5b |
| Fremont County | Zone 4a, 4b, 5a and 5b |
| Goshen County | Zone 4b, 5a and 5b |
| Hot Springs County | Zone 4a, 4b, 5a and 5b |
| Johnson County | Zone 3b, 4a, 4b, 5a and 5b |
| Laramie County | Zone 5a and 5b |
| Lincoln County | Zone 3b, 4a, 4b, 5a, 5b and 6a |
| Natrona County | Zone 4a, 4b, 5a, 5b and 6a |
| Niobrara County | Zone 4a, 4b and 5a |
| Park County | Zone 3b, 4a, 4b, 5a and 5b |
| Platte County | Zone 4b, 5a and 5b |
| Sheridan County | Zone 4a, 4b, 5a and 5b |
| Sublette County | Zone 3b, 4a, 4b, 5a and 5b |
| Sweetwater County | Zone 4a, 4b, 5a, 5b and 6a |
| Teton County | Zone 3b, 4a, 4b, 5a, 5b and 6a |
| Uinta County | Zone 4a, 4b, 5a, 5b and 6a |
| Washakie County | Zone 4a, 4b, 5a and 5b |
| Weston County | Zone 4a, 4b, 5a and 5b |
USDA Hardiness Zones for Wyoming Cities and Towns
| Wyoming City/Town | 2023 USDA Hardiness Zone(s) |
|---|---|
| Afton | Zone 4b and 5a |
| Albany | Zone 4b and 5a |
| Albin | Zone 5b |
| Alcova | Zone 5a and 5b |
| Alpine | Zone 5a |
| Alpine Northeast | Zone 5a, 5b and 6a |
| Alpine Northwest | Zone 5a |
| Alta | Zone 4b and 5a |
| Antelope Hills | Zone 5a |
| Arapahoe | Zone 4b and 5a |
| Arlington | Zone 5a |
| Arrowhead Springs | Zone 5a and 5b |
| Arvada | Zone 4b |
| Atlantic City | Zone 5a |
| Auburn | Zone 4b and 5a |
| Baggs | Zone 4b |
| Bairoil | Zone 5a |
| Bar Nunn | Zone 5a |
| Basin | Zone 4b |
| Bear River | Zone 4b, 5a and 5b |
| Bedford | Zone 4b, 5a and 5b |
| Bessemer Bend | Zone 5a |
| Beulah | Zone 5a |
| Big Horn | Zone 5a |
| Big Piney | Zone 4a |
| Bondurant | Zone 4a, 4b, 5a and 5b |
| Boulder | Zone 3b and 4a |
| Boulder Flats | Zone 5a |
| Brookhurst | Zone 5a |
| Buffalo | Zone 5a and 5b |
| Burlington | Zone 5a |
| Burns | Zone 5a |
| Byron | Zone 5a |
| Carter | Zone 4b and 5a |
| Casper | Zone 5a |
| Casper Mountain | Zone 5a and 5b |
| Centennial | Zone 4b and 5a |
| Cheyenne | Zone 5a and 5b |
| Chugcreek | Zone 5a |
| Chugwater | Zone 5a |
| Clearmont | Zone 4b |
| Clearview Acres | Zone 5a |
| Cody | Zone 5a and 5b |
| Cokeville | Zone 4a |
| Cora | Zone 4a |
| Cowley | Zone 4b and 5a |
| Crowheart | Zone 4b and 5a |
| Daniel | Zone 4a |
| Dayton | Zone 4b and 5a |
| Deaver | Zone 4b |
| Diamondville | Zone 4b and 5a |
| Dixon | Zone 4b |
| Douglas | Zone 4b and 5a |
| Dubois | Zone 4b |
| East Thermopolis | Zone 5a |
| Eden | Zone 4a |
| Edgerton | Zone 5a |
| Elk Mountain | Zone 5a |
| Encampment | Zone 5a |
| Esterbrook | Zone 5a and 5b |
| Ethete | Zone 4b and 5a |
| Etna | Zone 5a |
| Evanston | Zone 5a and 5b |
| Evansville | Zone 5a |
| Fairview | Zone 4b |
| Farson | Zone 4a |
| Fontenelle | Zone 4a |
| Fort Bridger | Zone 5a |
| Fort Washakie | Zone 5a |
| Fox Farm-College | Zone 5b |
| Fox Park | Zone 4b |
| Frannie | Zone 5a |
| Freedom | Zone 5a |
| Garland | Zone 5a |
| Gillette | Zone 5a |
| Glendo | Zone 5a |
| Glenrock | Zone 5a |
| Granger | Zone 4b |
| Green River | Zone 5a, 5b and 6a |
| Greybull | Zone 4b |
| Grover | Zone 4b, 5a and 5b |
| Guernsey | Zone 5a |
| Hanna | Zone 4b and 5a |
| Hartrandt | Zone 5a |
| Hartville | Zone 5a |
| Hawk Springs | Zone 5a |
| Hill View Heights | Zone 5a |
| Hillsdale | Zone 5a |
| Hoback | Zone 4b, 5a, 5b and 6a |
| Homa Hills | Zone 5a |
| Hudson | Zone 4b and 5a |
| Hulett | Zone 4b |
| Huntley | Zone 5a |
| Hyattville | Zone 4b and 5a |
| Jackson | Zone 4b, 5a and 5b |
| James Town | Zone 5a |
| Jeffrey City | Zone 4b and 5a |
| Johnstown | Zone 5a |
| Kaycee | Zone 4b |
| Kelly | Zone 4a |
| Kemmerer | Zone 4b and 5a |
| La Barge | Zone 3b |
| La Grange | Zone 5a |
| Lakeview North | Zone 5a |
| Lance Creek | Zone 4b and 5a |
| Lander | Zone 4b and 5a |
| Laramie | Zone 4a and 4b |
| Lingle | Zone 5a |
| Little America | Zone 5a |
| Lonetree | Zone 5a and 5b |
| Lost Springs | Zone 4b |
| Lovell | Zone 5a |
| Lucerne | Zone 4b and 5a |
| Lusk | Zone 5a |
| Lyman | Zone 5a |
| Mammoth | Zone 5a |
| Manderson | Zone 4b |
| Manville | Zone 5a |
| Marbleton | Zone 4a |
| McKinnon | Zone 5b |
| Meadow Acres | Zone 5a |
| Medicine Bow | Zone 4a and 4b |
| Meeteetse | Zone 4b |
| Midwest | Zone 5a |
| Mills | Zone 5a |
| Moorcroft | Zone 4b |
| Moose Wilson Road | Zone 4b |
| Mountain View | Zone 5a |
| Mountain View | Zone 5a and 5b |
| Newcastle | Zone 5a |
| Nordic | Zone 5a, 5b and 6a |
| North Rock Springs | Zone 5a, 5b and 6a |
| Oakley | Zone 4b and 5a |
| Opal | Zone 4b |
| Osage | Zone 4b and 5a |
| Osmond | Zone 4b |
| Owl Creek | Zone 4b and 5a |
| Parkman | Zone 5a |
| Pavillion | Zone 5a |
| Pine Bluffs | Zone 5a |
| Pine Haven | Zone 4b |
| Pinedale | Zone 4a |
| Point of Rocks | Zone 4b and 5a |
| Powder River | Zone 5a |
| Powell | Zone 5a |
| Purple Sage | Zone 5a |
| Rafter J Ranch | Zone 4b |
| Ralston | Zone 5a |
| Ranchester | Zone 4b |
| Ranchettes | Zone 5b |
| Rawlins | Zone 5a |
| Red Butte | Zone 5a |
| Reliance | Zone 5a and 5b |
| Riverside | Zone 5a |
| Riverton | Zone 4b and 5a |
| Robertson | Zone 5b |
| Rock River | Zone 4a and 4b |
| Rock Springs | Zone 5a and 5b |
| Rolling Hills | Zone 5a |
| Ryan Park | Zone 5a |
| Saratoga | Zone 4b |
| Shell | Zone 4b and 5a |
| Sheridan | Zone 4b and 5a |
| Shoshoni | Zone 4b |
| Sinclair | Zone 4b and 5a |
| Slater | Zone 5a and 5b |
| Sleepy Hollow | Zone 5a |
| Smoot | Zone 4b, 5a and 5b |
| South Park | Zone 4b |
| Star Valley Ranch | Zone 4b, 5a and 5b |
| Story | Zone 5a |
| Sundance | Zone 4b and 5a |
| Superior | Zone 5a and 5b |
| Table Rock | Zone 4b |
| Taylor | Zone 4a, 4b, 5a and 5b |
| Ten Sleep | Zone 4b and 5a |
| Teton Village | Zone 4b, 5a and 5b |
| Thayne | Zone 5a |
| Thermopolis | Zone 5a |
| Torrington | Zone 5a |
| Turnerville | Zone 4b, 5a and 5b |
| Upton | Zone 4b |
| Urie | Zone 5a and 5b |
| Van Tassell | Zone 5a |
| Veteran | Zone 5a |
| Vista West | Zone 5a |
| Wamsutter | Zone 4b |
| Warren AFB | Zone 5b |
| Washam | Zone 5b |
| Westview Circle | Zone 5a |
| Wheatland | Zone 5a |
| Whiting | Zone 5a |
| Wilson | Zone 4b, 5a, 5b and 6a |
| Woods Landing-Jelm | Zone 4a, 4b and 5a |
| Worland | Zone 4b |
| Wright | Zone 5a |
| Y-O Ranch | Zone 5a |
| Yoder | Zone 5a |