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

Planting zone for 82837 — Leiter, WY

ZIP code 82837 (Leiter, Sheridan County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 14 and the first fall frost September 30.

Where ZIP 82837 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.

Zone4b−25 to −20 °F
Coldest night−31.7 to −28.9 °C
Last frostMay 14
First frostSep 30
2012 zone4a

Was 4a 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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Leiter, 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 Leiter, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 14median — 50% chance of a later frost
Safe for tender plantsMay 29only 10% chance of frost after
First fall frostSeptember 30median — 10% chance by Sep 17
Growing season137 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 2 and returns around October 8.

From the NOAA station Leiter 9n, WY — 9 miles away, elevation 4,160 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 82837

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 2 – Apr 16
SpinachSow outdoors · Apr 2 – Apr 23
Broccoli, cabbageStart indoors · Mar 5 – Mar 19
Broccoli, cabbageTransplant · Apr 23 – May 7
Onion setsPlant outdoors · Apr 16 – Apr 30
PotatoesPlant outdoors · Apr 23 – May 7
LettuceSow outdoors · Apr 16 – Apr 30
Carrots, beetsSow outdoors · Apr 23 – May 7
TomatoesStart indoors · Mar 19 – Apr 2
TomatoesTransplant · May 21 – Jun 4
Peppers, eggplantStart indoors · Mar 5 – Mar 19
Peppers, eggplantTransplant · May 28 – Jun 11
BeansSow outdoors · May 21 – Jun 4
Sweet cornSow outdoors · May 21 – Jun 4
Cucumbers, squashSow outdoors · May 21 – Jun 4
Fall lettuce, spinachSow outdoors · Aug 5 – Aug 19
GarlicPlant cloves · Sep 16 – Oct 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 14) and first fall frost (Sep 30) 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 82837 came on Mar 21 — 18 days earlier than the 1991–2020 average (Apr 8).

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 4b in Wyoming

495 plants native to the lower 48 states, recorded in Wyoming, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. 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 83

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 226

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 152

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 Leiter, WY.

Soil in Leiter, WY

The soil mapped at the center of ZIP 82837 is Kishona — loam, well drained.

TextureLoama good balance for most vegetables
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importance, if irrigatedUSDA classification

Map unit: Kishona-Cambria complex, 0 to 3 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 82837; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Leiter, WY

Summer high89 °Faverage high, July
Winter low14 °Faverage low, January
Hot days39days a year at 90 °F or more
Freezing nights168nights a year at 32 °F or less
Growing degree days2,492base 50 °F — the season’s usable heat
Longest day15 h 35 mindaylight on June 21
Shortest day8 h 48 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation15 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 35 °F, low 14 °F 35°14° JanFebruary: average high 37 °F, low 16 °F 37°16° FebMarch: average high 49 °F, low 24 °F 49°24° MarApril: average high 57 °F, low 32 °F 57°32° AprMay: average high 67 °F, low 41 °F 67°41° MayJune: average high 78 °F, low 50 °F 78°50° JunJuly: average high 89 °F, low 57 °F 89°57° JulAugust: average high 88 °F, low 56 °F 88°56° AugSeptember: average high 77 °F, low 46 °F 77°46° SepOctober: average high 60 °F, low 34 °F 60°34° OctNovember: average high 46 °F, low 23 °F 46°23° NovDecember: average high 35 °F, low 14 °F 35°14° Dec

Precipitation by month inches

0″1″2″3″January: 0.57 in precipitation 0.6 JanFebruary: 0.81 in precipitation 0.8 FebMarch: 0.79 in precipitation 0.8 MarApril: 1.67 in precipitation 1.7 AprMay: 2.66 in precipitation 2.7 MayJune: 1.94 in precipitation 1.9 JunJuly: 1.65 in precipitation 1.6 JulAugust: 0.77 in precipitation 0.8 AugSeptember: 1.21 in precipitation 1.2 SepOctober: 1.53 in precipitation 1.5 OctNovember: 0.76 in precipitation 0.8 NovDecember: 0.63 in precipitation 0.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Leiter 9n, WY (9 mi away); precipitation: Clearmont 5.1 Nne, WY (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

828355a
Clearmont, WY · 4 mi
828314b
Arvada, WY · 12 mi
828455a
Wyarno, WY · 22 mi
828325a
Banner, WY · 25 mi
590625a
Otter, MT · 29 mi
828015a
Sheridan, WY · 31 mi
590255a
Decker, MT · 32 mi
828405a
Saddlestring, WY · 33 mi

Wyoming planting zones →

Questions about 82837

What planting zone is ZIP code 82837?

ZIP code 82837 (Leiter, WY) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Leiter, WY?

The median last spring frost (32 °F) near 82837 is May 14; after May 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Leiter 9n station.

When is the first frost in Leiter, WY?

The median first fall frost near 82837 is September 30, giving a median frost-free growing season of 137 days.

When should I plant tomatoes in 82837?

Start tomato seeds indoors around Mar 19 – Apr 2 and set transplants outside around May 21 – Jun 4, one to three weeks after the median last frost.

How much rain and snow does 82837 get?

About 15 inches of precipitation a year (NOAA 1991–2020 normals, Clearmont 5.1 Nne station).

How hot do summers get in Leiter, WY?

The average high peaks at 89 °F in July, with about 39 days a year at 90 °F or more.

What kind of soil does 82837 have?

The USDA soil survey maps Kishona at the center of ZIP 82837: loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Leiter, WY in 2026?

Spring leaf-out near 82837 came on Mar 21 in 2026, 18 days earlier than the 1991–2020 average (Apr 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Leiter, WY?

Long-day onions: the longest day near 82837 is 15 h 35 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 82837 change?

Yes. The 2012 USDA map put 82837 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.