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

Planting zone for 83012 — Moose, WY

ZIP code 83012 (Moose, Teton County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is June 24 and the first fall frost August 28.

Where ZIP 83012 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.

Zone4a−30 to −25 °F

Coldest night−34.4 to −31.7 °C

Last frostJun 24

First frostAug 28

2012 zone4a

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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Moose, 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 Moose, WY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostJune 24median — 50% chance of a later frost

Safe for tender plantsJuly 11only 10% chance of frost after

First fall frostAugust 28median — 10% chance by Aug 8

Growing season63 daysfrost-free, median

A hard freeze (28 °F) usually ends around June 7 and returns around September 12.

From the NOAA station Moose 1 Nne, WY — 6 miles away, elevation 6,467 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 83012

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · May 13 – May 27

SpinachSow outdoors · May 13 – Jun 3

Broccoli, cabbageStart indoors · Apr 15 – Apr 29

Broccoli, cabbageTransplant · Jun 3 – Jun 17

Onion setsPlant outdoors · May 27 – Jun 10

PotatoesPlant outdoors · Jun 3 – Jun 17

LettuceSow outdoors · May 27 – Jun 10

Carrots, beetsSow outdoors · Jun 3 – Jun 17

TomatoesStart indoors · Apr 29 – May 13

TomatoesTransplant · Jul 1 – Jul 15

Peppers, eggplantStart indoors · Apr 15 – Apr 29

Peppers, eggplantTransplant · Jul 8 – Jul 22

BeansSow outdoors · Jul 1 – Jul 15

Sweet cornSow outdoors · Jul 1 – Jul 15

Cucumbers, squashSow outdoors · Jul 1 – Jul 15

Fall lettuce, spinachSow outdoors · Jul 3 – Jul 17

GarlicPlant cloves · Aug 14 – Sep 18

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 24) and first fall frost (Aug 28) 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 83012 came on May 12 — 11 days earlier than the 1991–2020 average (May 23).

average
May 232026
May 12

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 4a in Wyoming

431 plants native to the lower 48 states, recorded in Wyoming, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. 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 Moose, WY.

Soil in Moose, WY

The center of ZIP 83012 is mapped as Rock outcrop *: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 83012; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Moose, WY

Summer high79 °Faverage high, July

Winter low2 °Faverage low, January

Hot days1days a year at 90 °F or more

Freezing nights235nights a year at 32 °F or less

Growing degree days902base 50 °F — the season’s usable heat

Longest day15 h 27 mindaylight on June 21

Shortest day8 h 55 mindaylight on December 21

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

Precipitation24.1 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: Moose 1 Nne, WY (6 mi away); precipitation: Moose 1 Nne, WY (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

830254b

Teton Village, WY · 9 mi

Wyoming planting zones →

Questions about 83012

What planting zone is ZIP code 83012?

ZIP code 83012 (Moose, WY) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Moose, WY?

The median last spring frost (32 °F) near 83012 is June 24; after July 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Moose 1 Nne station.

When is the first frost in Moose, WY?

The median first fall frost near 83012 is August 28, giving a median frost-free growing season of 63 days.

When should I plant tomatoes in 83012?

Start tomato seeds indoors around Apr 29 – May 13 and set transplants outside around Jul 1 – Jul 15, one to three weeks after the median last frost.

How much rain and snow does 83012 get?

About 24.1 inches of precipitation a year (NOAA 1991–2020 normals, Moose 1 Nne station).

How hot do summers get in Moose, WY?

The average high peaks at 79 °F in July, with about 1 days a year at 90 °F or more.

Did spring come early in Moose, WY in 2026?

Spring leaf-out near 83012 came on May 12 in 2026, 11 days earlier than the 1991–2020 average (May 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Moose, WY?

Long-day onions: the longest day near 83012 is 15 h 27 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).