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

Planting zone for 82003 — Cheyenne, WY

ZIP code 82003 (Cheyenne, Laramie County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 21 and the first fall frost September 24.

Where ZIP 82003 is

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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 21
First frostSep 24
2012 zone5b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Cheyenne, WY…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Cheyenne, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 21median — 50% chance of a later frost
Safe for tender plantsJune 6only 10% chance of frost after
First fall frostSeptember 24median — 10% chance by Sep 8
Growing season124 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 9 and returns around October 1.

From the NOAA station Archer, WY — 5 miles away, elevation 6,011 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 82003

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 9 – Apr 23
SpinachSow outdoors · Apr 9 – Apr 30
Broccoli, cabbageStart indoors · Mar 12 – Mar 26
Broccoli, cabbageTransplant · Apr 30 – May 14
Onion setsPlant outdoors · Apr 23 – May 7
PotatoesPlant outdoors · Apr 30 – May 14
LettuceSow outdoors · Apr 23 – May 7
Carrots, beetsSow outdoors · Apr 30 – May 14
TomatoesStart indoors · Mar 26 – Apr 9
TomatoesTransplant · May 28 – Jun 11
Peppers, eggplantStart indoors · Mar 12 – Mar 26
Peppers, eggplantTransplant · Jun 4 – Jun 18
BeansSow outdoors · May 28 – Jun 11
Sweet cornSow outdoors · May 28 – Jun 11
Cucumbers, squashSow outdoors · May 28 – Jun 11
Fall lettuce, spinachSow outdoors · Jul 30 – Aug 13
GarlicPlant cloves · Sep 10 – Oct 15
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 21) and first fall frost (Sep 24) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 82003 came on Mar 4 — 33 days earlier than the 1991–2020 average (Apr 6).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 5b in Wyoming

549 plants native to the lower 48 states, recorded in Wyoming, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 22

American elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 99

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °F

Wildflowers & perennials 254

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °F

Grasses 162

Alaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAlpine Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 3

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Cheyenne, WY.

Soil in Cheyenne, WY

The soil mapped at the center of ZIP 82003 is Ipson — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Ipson-Evanston complex, 6 to 30 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 82003; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cheyenne, WY

Summer high88 °Faverage high, July
Winter low14 °Faverage low, December
Hot days26days a year at 90 °F or more
Freezing nights196nights a year at 32 °F or less
Growing degree days2,137base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 12 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation18.2 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 15 °F 42°15° JanFebruary: average high 43 °F, low 15 °F 43°15° FebMarch: average high 52 °F, low 22 °F 52°22° MarApril: average high 58 °F, low 28 °F 58°28° AprMay: average high 67 °F, low 38 °F 67°38° MayJune: average high 79 °F, low 46 °F 79°46° JunJuly: average high 88 °F, low 52 °F 88°52° JulAugust: average high 85 °F, low 50 °F 85°50° AugSeptember: average high 77 °F, low 42 °F 77°42° SepOctober: average high 63 °F, low 30 °F 63°30° OctNovember: average high 51 °F, low 21 °F 51°21° NovDecember: average high 42 °F, low 14 °F 42°14° Dec

Precipitation by month inches

0″1″2″3″January: 0.53 in precipitation 0.5 JanFebruary: 1.00 in precipitation 1.0 FebMarch: 1.19 in precipitation 1.2 MarApril: 2.14 in precipitation 2.1 AprMay: 2.58 in precipitation 2.6 MayJune: 2.36 in precipitation 2.4 JunJuly: 2.33 in precipitation 2.3 JulAugust: 1.58 in precipitation 1.6 AugSeptember: 1.55 in precipitation 1.6 SepOctober: 1.38 in precipitation 1.4 OctNovember: 0.81 in precipitation 0.8 NovDecember: 0.76 in precipitation 0.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Archer, WY (5 mi away); precipitation: Cheyenne 7ne, WY (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

820075b
Cheyenne, WY · 9 mi
820605a
Hillsdale, WY · 10 mi
820025b
Cheyenne, WY · 10 mi
820065b
Cheyenne, WY · 10 mi
820105b
Cheyenne, WY · 10 mi
820055b
Fe Warren Afb, WY · 12 mi
820095b
Cheyenne, WY · 15 mi
820015b
Cheyenne, WY · 16 mi

All 7 ZIP codes in Cheyenne → · Wyoming planting zones →

Questions about 82003

What planting zone is ZIP code 82003?

ZIP code 82003 (Cheyenne, WY) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Cheyenne, WY?

The median last spring frost (32 °F) near 82003 is May 21; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Archer station.

When is the first frost in Cheyenne, WY?

The median first fall frost near 82003 is September 24, giving a median frost-free growing season of 124 days.

When should I plant tomatoes in 82003?

Start tomato seeds indoors around Mar 26 – Apr 9 and set transplants outside around May 28 – Jun 11, one to three weeks after the median last frost.

How much rain and snow does 82003 get?

About 18.2 inches of precipitation a year (NOAA 1991–2020 normals, Cheyenne 7ne station).

How hot do summers get in Cheyenne, WY?

The average high peaks at 88 °F in July, with about 26 days a year at 90 °F or more.

What kind of soil does 82003 have?

The USDA soil survey maps Ipson at the center of ZIP 82003: gravelly loam, well drained, pH about 7.2 (neutral).

Did spring come early in Cheyenne, WY in 2026?

Spring leaf-out near 82003 came on Mar 4 in 2026, 33 days earlier than the 1991–2020 average (Apr 6), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Cheyenne, WY?

Long-day onions: the longest day near 82003 is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).