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

Planting zone for 82649 — Shoshoni, WY

ZIP code 82649 (Shoshoni, Fremont County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 7 and the first fall frost October 3.

Where ZIP 82649 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 7
First frostOct 3
2012 zone4b

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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Shoshoni, 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 Shoshoni, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 7median — 50% chance of a later frost
Safe for tender plantsMay 18only 10% chance of frost after
First fall frostOctober 3median — 10% chance by Sep 23
Growing season145 daysfrost-free, median

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

From the NOAA station Shoshoni, WY — 6 miles away, elevation 4,836 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 82649

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 26 – Apr 9
SpinachSow outdoors · Mar 26 – Apr 16
Broccoli, cabbageStart indoors · Feb 26 – Mar 12
Broccoli, cabbageTransplant · Apr 16 – Apr 30
Onion setsPlant outdoors · Apr 9 – Apr 23
PotatoesPlant outdoors · Apr 16 – Apr 30
LettuceSow outdoors · Apr 9 – Apr 23
Carrots, beetsSow outdoors · Apr 16 – Apr 30
TomatoesStart indoors · Mar 12 – Mar 26
TomatoesTransplant · May 14 – May 28
Peppers, eggplantStart indoors · Feb 26 – Mar 12
Peppers, eggplantTransplant · May 21 – Jun 4
BeansSow outdoors · May 14 – May 28
Sweet cornSow outdoors · May 14 – May 28
Cucumbers, squashSow outdoors · May 14 – May 28
Fall lettuce, spinachSow outdoors · Aug 8 – Aug 22
GarlicPlant cloves · Sep 19 – Oct 24
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 3) 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 82649 came on Mar 19 — 22 days earlier than the 1991–2020 average (Apr 10).

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 Shoshoni, WY.

Soil in Shoshoni, WY

The soil mapped at the center of ZIP 82649 is Worland — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH8.2alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Worland-Oceanet-Persayo association, rolling.

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 82649; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Shoshoni, WY

Summer high90 °Faverage high, July
Winter low1 °Faverage low, January
Hot days46days a year at 90 °F or more
Freezing nights176nights a year at 32 °F or less
Growing degree days2,592base 50 °F — the season’s usable heat
Longest day15 h 24 mindaylight on June 21
Shortest day8 h 58 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation8 inper year, rain and melted snow
Snowfall18 inper year; 37 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 28 °F, low 1 °F 28°1° JanFebruary: average high 36 °F, low 11 °F 36°11° FebMarch: average high 53 °F, low 24 °F 53°24° MarApril: average high 62 °F, low 33 °F 62°33° AprMay: average high 70 °F, low 42 °F 70°42° MayJune: average high 82 °F, low 50 °F 82°50° JunJuly: average high 90 °F, low 58 °F 90°58° JulAugust: average high 88 °F, low 55 °F 88°55° AugSeptember: average high 77 °F, low 46 °F 77°46° SepOctober: average high 61 °F, low 32 °F 61°32° OctNovember: average high 43 °F, low 20 °F 43°20° NovDecember: average high 29 °F, low 5 °F 29°5° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.23 in precipitation, 3.2 in snowfall 0.2❄3 JanFebruary: 0.37 in precipitation, 3.5 in snowfall 0.4❄4 FebMarch: 0.34 in precipitation, 2.5 in snowfall 0.3❄3 MarApril: 1.03 in precipitation, 1.7 in snowfall 1.0❄2 AprMay: 1.84 in precipitation, 0.4 in snowfall 1.8 MayJune: 1.01 in precipitation 1.0 JunJuly: 0.76 in precipitation 0.8 JulAugust: 0.48 in precipitation 0.5 AugSeptember: 0.86 in precipitation, 0.1 in snowfall 0.9 SepOctober: 0.59 in precipitation, 1 in snowfall 0.6❄1 OctNovember: 0.30 in precipitation, 2.2 in snowfall 0.3❄2 NovDecember: 0.18 in precipitation, 2.9 in snowfall 0.2❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Shoshoni, WY (6 mi away); precipitation: Shoshoni, WY (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

826425a
Lysite, WY · 18 mi
825015a
Riverton, WY · 21 mi
825244b
Saint Stephens, WY · 29 mi
826305a
Arminto, WY · 36 mi
825105a
Arapahoe, WY · 36 mi
824304b
Kirby, WY · 37 mi
824435a
Thermopolis, WY · 38 mi
825155a
Hudson, WY · 38 mi

Wyoming planting zones →

Questions about 82649

What planting zone is ZIP code 82649?

ZIP code 82649 (Shoshoni, 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 Shoshoni, WY?

The median last spring frost (32 °F) near 82649 is May 7; after May 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Shoshoni station.

When is the first frost in Shoshoni, WY?

The median first fall frost near 82649 is October 3, giving a median frost-free growing season of 145 days.

When should I plant tomatoes in 82649?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 82649 get?

About 8 inches of precipitation a year and 18 inches of snowfall (NOAA 1991–2020 normals, Shoshoni station).

How hot do summers get in Shoshoni, WY?

The average high peaks at 90 °F in July, with about 46 days a year at 90 °F or more.

What kind of soil does 82649 have?

The USDA soil survey maps Worland at the center of ZIP 82649: sandy loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Shoshoni, WY in 2026?

Spring leaf-out near 82649 came on Mar 19 in 2026, 22 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Shoshoni, WY?

Long-day onions: the longest day near 82649 is 15 h 24 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).