Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Wyoming planting zones

Wyoming spans USDA zones 4a to 5b on the 2023 map; the most common is 5a. The typical last spring frost is around May 22 and the first fall frost around Sep 23.

Zone map of Wyoming

Outside Wyoming is dimmed · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

ZIP codes per zone

4a−30 to −25 °F104b−25 to −20 °F435a−20 to −15 °F1115b−15 to −10 °F28

At a glance

ZIP codes192
Zones4a–5b
Typical last frostMay 22
Typical first frostSep 23

Largest cities in Wyoming

Cheyenne5b
Last frost May 14 · first Oct 1 · 7 ZIPs
Casper5a
Last frost May 26 · first Sep 22 · 5 ZIPs
Gillette5a
Last frost May 21 · first Sep 23 · 3 ZIPs
Laramie4a 4b 5b
Last frost Jun 2 · first Sep 15 · 3 ZIPs
Evanston5a
Last frost Jun 14 · first Sep 9 · 2 ZIPs
Jackson4b
Last frost Jun 20 · first Aug 31 · 2 ZIPs
Rock Springs5a 5b
Last frost May 22 · first Sep 28 · 2 ZIPs

Wyoming extremes

From the 2023 zone data and NOAA 1991–2020 normals of the nearest station. One entry per town.

Mildest winters

highest zone

  1. Cheyenne 820015b
  2. Fe Warren Afb 820055b
  3. Albin 820505b
  4. Buford 820525b
  5. Carpenter 820545b
  6. Granite Canon 820595b

Coldest winters

lowest zone

  1. Bosler 820514a
  2. Laramie 820724a
  3. Medicine Bow 823294a
  4. Boulder 829234a
  5. Farson 829324a
  6. Moose 830124a

Longest growing season

median frost-free days

  1. Basin 82410164 d
  2. Manderson 82432164 d
  3. Guernsey 82214152 d
  4. Worland 82401149 d
  5. Glendo 82213148 d
  6. Byron 82412148 d

Shortest growing season

median frost-free days

  1. Moose 8301263 d
  2. Moran 8301363 d
  3. Jackson 8300170 d
  4. Kelly 8301170 d
  5. Wilson 8301470 d
  6. Teton Village 8302570 d

Wettest

precipitation per year

  1. Alta 8341449.7 in
  2. Encampment 8232544.9 in
  3. Wilson 8301441.8 in
  4. Teton Village 8302541.8 in
  5. Cody 8241438 in
  6. Centennial 8205535.4 in

Snowiest

snowfall per year

  1. Yellowstone National Park 82190197 in
  2. Kelly 83011166 in
  3. Bondurant 82922141 in
  4. Afton 8311088 in
  5. Fairview 8311988 in
  6. Mills 8264482 in

Hottest summers

days at 90 °F or more

  1. Huntley 8221853 d
  2. Torrington 8224053 d
  3. Worland 8240151 d
  4. Basin 8241049 d
  5. Greybull 8242649 d
  6. Manderson 8243249 d

All places in Wyoming

A

Afton · Aladdin · Albin · Alcova · Alpine · Alta · Alva · Arapahoe · Arminto · Arvada · Auburn

B

Baggs · Bairoil · Banner · Basin · Bedford · Beulah · Big Horn · Big Piney · Bondurant · Bosler · Boulder · Buffalo · Buford · Burlington · Burns · Byron

C

Carpenter · Casper · Centennial · Cheyenne · Chugwater · Clearmont · Cody · Cokeville · Cora · Cowley · Crowheart

D

Daniel · Dayton · Deaver · Devils Tower · Diamondville · Dixon · Douglas · Dubois

E

Edgerton · Elk Mountain · Emblem · Encampment · Etna · Evanston · Evansville

F

Fairview · Farson · Fe Warren Afb · Fort Bridger · Fort Laramie · Fort Washakie · Frannie · Freedom · Frontier

G

Garrett · Gillette · Glendo · Glenrock · Granger · Granite Canon · Green River · Greybull · Grover · Guernsey

H

Hanna · Hartville · Hawk Springs · Hiland · Hillsdale · Horse Creek · Hudson · Hulett · Huntley · Hyattville

J

Jackson · Jay Em · Jeffrey City · Jelm

K

Kaycee · Kelly · Kemmerer · Kinnear · Kirby

L

La Barge · Lagrange · Lance Creek · Lander · Laramie · Leiter · Linch · Lingle · Little America · Lonetree · Lost Springs · Lovell · Lusk · Lyman · Lysite

M

Manderson · Manville · Mc Kinnon · Medicine Bow · Meeteetse · Meriden · Midwest · Mills · Moorcroft · Moose · Moran · Mountain View

N

Natrona · Newcastle

O

Opal · Osage · Otto

P

Parkman · Pavillion · Pine Bluffs · Pinedale · Point Of Rocks · Powder River · Powell

R

Ralston · Ranchester · Rawlins · Recluse · Reliance · Riverton · Robertson · Rock River · Rock Springs · Rozet

S

Saddlestring · Saint Stephens · Saratoga · Savery · Shawnee · Shell · Sheridan · Shirley Basin · Shoshoni · Sinclair · Smoot · Story · Sundance · Superior

T

Ten Sleep · Teton Village · Thayne · Thermopolis · Tie Siding · Torrington

U

Upton

V

Van Tassell · Veteran

W

Walcott · Wamsutter · Wapiti · Weston · Wheatland · Wilson · Wolf · Worland · Wright · Wyarno

Y

Yellowstone National Park · Yoder

Questions

What planting zones are in Wyoming?

Wyoming spans USDA hardiness zones 4a to 5b on the 2023 map. The most common zone is 5a (111 of 192 ZIP codes).

When is the last frost in Wyoming?

Across Wyoming, the median last spring frost ranges from about Apr 28 to Jun 24 depending on location; the typical ZIP code sees it around May 22. Look up your ZIP code for a local date.