Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 82450 — Wapiti, WY

ZIP code 82450 (Wapiti, Park County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 27 and the first fall frost September 25.

Where ZIP 82450 is

Outlined: the ZIP code area · 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.

Zone5a−20 to −15 °F

Coldest night−28.9 to −26.1 °C

Last frostMay 27

First frostSep 25

2012 zone5a

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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Wapiti, 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 Wapiti, WY

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 27median — 50% chance of a later frost

Safe for tender plantsJune 12only 10% chance of frost after

First fall frostSeptember 25median — 10% chance by Sep 7

Growing season121 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 11 and returns around October 5.

From the NOAA station Wapiti 1wsw, WY — 3 miles away, elevation 5,558 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 82450

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 15 – Apr 29

SpinachSow outdoors · Apr 15 – May 6

Broccoli, cabbageStart indoors · Mar 18 – Apr 1

Broccoli, cabbageTransplant · May 6 – May 20

Onion setsPlant outdoors · Apr 29 – May 13

PotatoesPlant outdoors · May 6 – May 20

LettuceSow outdoors · Apr 29 – May 13

Carrots, beetsSow outdoors · May 6 – May 20

TomatoesStart indoors · Apr 1 – Apr 15

TomatoesTransplant · Jun 3 – Jun 17

Peppers, eggplantStart indoors · Mar 18 – Apr 1

Peppers, eggplantTransplant · Jun 10 – Jun 24

BeansSow outdoors · Jun 3 – Jun 17

Sweet cornSow outdoors · Jun 3 – Jun 17

Cucumbers, squashSow outdoors · Jun 3 – Jun 17

Fall lettuce, spinachSow outdoors · Jul 31 – Aug 14

GarlicPlant cloves · Sep 11 – Oct 16

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 27) and first fall frost (Sep 25) 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 82450 came on Apr 7 — 19 days earlier than the 1991–2020 average (Apr 26).

average
Apr 262026
Apr 7

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 5a in Wyoming

542 plants native to the lower 48 states, recorded in Wyoming, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. Each links to its USDA PLANTS profile.

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 Wapiti, WY.

Soil in Wapiti, WY

The soil mapped at the center of ZIP 82450 is Spudbar-like — very cobbly coarse sandy loam, well drained.

TextureVery cobbly coarse sandy loamdrains and warms fast; dries out and needs more feeding

pH7.2neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Spudbar-like, very stony-Mantlemine-like, stony-Foreleft, stony complex, 6 to 40 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 82450; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Wapiti, WY

Summer high83 °Faverage high, July

Winter low17 °Faverage low, February

Hot days8days a year at 90 °F or more

Freezing nights174nights a year at 32 °F or less

Growing degree days1,684base 50 °F — the season’s usable heat

Longest day15 h 33 mindaylight on June 21

Shortest day8 h 49 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation10.3 inper year, rain and melted snow

Snowfall31 inper year; 35 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Wapiti 1wsw, WY (3 mi away); precipitation: Wapiti 1wsw, WY (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Meeteetse, WY · 35 mi

590685a

Red Lodge, MT · 41 mi

590085a

Belfry, MT · 43 mi

590814a

Silver Gate, MT · 45 mi

590075a

Bearcreek, MT · 48 mi

Wyoming planting zones →

Questions about 82450

What planting zone is ZIP code 82450?

ZIP code 82450 (Wapiti, WY) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Wapiti, WY?

The median last spring frost (32 °F) near 82450 is May 27; after June 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wapiti 1wsw station.

When is the first frost in Wapiti, WY?

The median first fall frost near 82450 is September 25, giving a median frost-free growing season of 121 days.

When should I plant tomatoes in 82450?

Start tomato seeds indoors around Apr 1 – Apr 15 and set transplants outside around Jun 3 – Jun 17, one to three weeks after the median last frost.

How much rain and snow does 82450 get?

About 10.3 inches of precipitation a year and 31 inches of snowfall (NOAA 1991–2020 normals, Wapiti 1wsw station).

How hot do summers get in Wapiti, WY?

The average high peaks at 83 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 82450 have?

The USDA soil survey maps Spudbar-like at the center of ZIP 82450: very cobbly coarse sandy loam, well drained, pH about 7.2 (neutral).

Did spring come early in Wapiti, WY in 2026?

Spring leaf-out near 82450 came on Apr 7 in 2026, 19 days earlier than the 1991–2020 average (Apr 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Wapiti, WY?

Long-day onions: the longest day near 82450 is 15 h 33 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).