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

Planting zone for 82512 — Crowheart, WY

ZIP code 82512 (Crowheart, Fremont County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 21 and the first fall frost September 20.

Where ZIP 82512 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 21

First frostSep 20

2012 zone4b

Was 4b on the 2012 map — half a zone warmer now. 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 Crowheart, 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 Crowheart, 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 20median — 10% chance by Sep 5

Growing season119 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around October 1.

From the NOAA station Diversion Dam, WY — 22 miles away, elevation 5,578 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 82512

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 26 – Aug 9

GarlicPlant cloves · Sep 6 – Oct 11

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 21) and first fall frost (Sep 20) 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 82512 came on May 19 — 10 days earlier than the 1991–2020 average (May 29).

average
May 292026
May 19

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 Crowheart, WY.

Soil in Crowheart, WY

The soil mapped at the center of ZIP 82512 is Oxyaquic Cryochrepts — slightly decomposed plant material, somewhat poorly drained.

TextureSlightly decomposed plant materialtop layer

DrainageSomewhat poorly drainedconsider raised beds

Organic matter85%high

Hydrologic groupB/Dmoderate when drained; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Alpine Ridges, Rubble land-Tundra Complex, 0 to 70 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 82512; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Crowheart, WY

Summer high85 °Faverage high, July

Winter low8 °Faverage low, January

Hot days14days a year at 90 °F or more

Freezing nights200nights a year at 32 °F or less

Growing degree days1,771base 50 °F — the season’s usable heat

Longest day15 h 22 mindaylight on June 21

Shortest day9 h 00 mindaylight on December 21

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

Precipitation20 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Diversion Dam, WY (22 mi away); precipitation: St. Lawrence Alt, WY (4 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.

825145a

Fort Washakie, WY · 11 mi

Pavillion, WY · 33 mi

Wyoming planting zones →

Questions about 82512

What planting zone is ZIP code 82512?

ZIP code 82512 (Crowheart, 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 Crowheart, WY?

The median last spring frost (32 °F) near 82512 is May 21; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Diversion Dam station.

When is the first frost in Crowheart, WY?

The median first fall frost near 82512 is September 20, giving a median frost-free growing season of 119 days.

When should I plant tomatoes in 82512?

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 82512 get?

About 20 inches of precipitation a year (NOAA 1991–2020 normals, St. Lawrence Alt station).

How hot do summers get in Crowheart, WY?

The average high peaks at 85 °F in July, with about 14 days a year at 90 °F or more.

What kind of soil does 82512 have?

The USDA soil survey maps Oxyaquic Cryochrepts at the center of ZIP 82512: slightly decomposed plant material, somewhat poorly drained.

Did spring come early in Crowheart, WY in 2026?

Spring leaf-out near 82512 came on May 19 in 2026, 10 days earlier than the 1991–2020 average (May 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Crowheart, WY?

Long-day onions: the longest day near 82512 is 15 h 22 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 82512 change?

Yes. The 2012 USDA map put 82512 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.