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

Planting zone for 83123 — La Barge, WY

ZIP code 83123 (La Barge, Lincoln County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is June 9 and the first fall frost September 4.

Where ZIP 83123 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 9
First frostSep 4
2012 zone3b

Was 3b 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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for La Barge, 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 La Barge, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 9median — 50% chance of a later frost
Safe for tender plantsJune 27only 10% chance of frost after
First fall frostSeptember 4median — 10% chance by Aug 21
Growing season84 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 24 and returns around September 15.

From the NOAA station La Barge, WY — 4 miles away, elevation 6,598 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 83123

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 28 – May 12
SpinachSow outdoors · Apr 28 – May 19
Broccoli, cabbageStart indoors · Mar 31 – Apr 14
Broccoli, cabbageTransplant · May 19 – Jun 2
Onion setsPlant outdoors · May 12 – May 26
PotatoesPlant outdoors · May 19 – Jun 2
LettuceSow outdoors · May 12 – May 26
Carrots, beetsSow outdoors · May 19 – Jun 2
TomatoesStart indoors · Apr 14 – Apr 28
TomatoesTransplant · Jun 16 – Jun 30
Peppers, eggplantStart indoors · Mar 31 – Apr 14
Peppers, eggplantTransplant · Jun 23 – Jul 7
BeansSow outdoors · Jun 16 – Jun 30
Sweet cornSow outdoors · Jun 16 – Jun 30
Cucumbers, squashSow outdoors · Jun 16 – Jun 30
Fall lettuce, spinachSow outdoors · Jul 10 – Jul 24
GarlicPlant cloves · Aug 21 – Sep 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 9) and first fall frost (Sep 4) 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 83123 came on Apr 15 — 18 days earlier than the 1991–2020 average (May 3).

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.

Trees 20

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 75

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °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 °FBarclay's willow15 ft · high shade tolerance · to −43 °F

Wildflowers & perennials 187

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 bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 138

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 La Barge, WY.

Soil in La Barge, WY

The soil mapped at the center of ZIP 83123 is Poposhia — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables
pH7.8slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Badland-Rock outcrop complex.

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 83123; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in La Barge, WY

Summer high83 °Faverage high, July
Winter low−2 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights240nights a year at 32 °F or less
Growing degree days1,305base 50 °F — the season’s usable heat
Longest day15 h 16 mindaylight on June 21
Shortest day9 h 05 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation8.6 inper year, rain and melted snow
Snowfall34 inper year; 73 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 30 °F, low -2 °F 30°−2° JanFebruary: average high 33 °F, low 2 °F 33°2° FebMarch: average high 45 °F, low 17 °F 45°17° MarApril: average high 54 °F, low 24 °F 54°24° AprMay: average high 64 °F, low 33 °F 64°33° MayJune: average high 74 °F, low 40 °F 74°40° JunJuly: average high 83 °F, low 46 °F 83°46° JulAugust: average high 82 °F, low 44 °F 82°44° AugSeptember: average high 72 °F, low 34 °F 72°34° SepOctober: average high 58 °F, low 24 °F 58°24° OctNovember: average high 42 °F, low 11 °F 42°11° NovDecember: average high 30 °F, low 0 °F 30°0° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.40 in precipitation, 5.2 in snowfall 0.4❄5 JanFebruary: 0.42 in precipitation, 6 in snowfall 0.4❄6 FebMarch: 0.45 in precipitation, 4.2 in snowfall 0.5❄4 MarApril: 0.71 in precipitation, 4.8 in snowfall 0.7❄5 AprMay: 1.26 in precipitation, 1.2 in snowfall 1.3❄1 MayJune: 0.95 in precipitation 0.9 JunJuly: 0.85 in precipitation 0.8 JulAugust: 0.85 in precipitation 0.8 AugSeptember: 0.96 in precipitation, 1.2 in snowfall 1.0❄1 SepOctober: 0.89 in precipitation, 3.3 in snowfall 0.9❄3 OctNovember: 0.34 in precipitation, 2.4 in snowfall 0.3❄2 NovDecember: 0.47 in precipitation, 5.5 in snowfall 0.5❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: La Barge, WY (4 mi away); precipitation: La Barge, WY (4 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.

831134a
Big Piney, WY · 22 mi
831015a
Kemmerer, WY · 23 mi
831214b
Frontier, WY · 30 mi
831244b
Opal, WY · 33 mi
831164b
Diamondville, WY · 36 mi
831144a
Cokeville, WY · 37 mi
831265a
Smoot, WY · 40 mi
831105b
Afton, WY · 45 mi

Wyoming planting zones →

Questions about 83123

What planting zone is ZIP code 83123?

ZIP code 83123 (La Barge, 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 La Barge, WY?

The median last spring frost (32 °F) near 83123 is June 9; after June 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, La Barge station.

When is the first frost in La Barge, WY?

The median first fall frost near 83123 is September 4, giving a median frost-free growing season of 84 days.

When should I plant tomatoes in 83123?

Start tomato seeds indoors around Apr 14 – Apr 28 and set transplants outside around Jun 16 – Jun 30, one to three weeks after the median last frost.

How much rain and snow does 83123 get?

About 8.6 inches of precipitation a year and 34 inches of snowfall (NOAA 1991–2020 normals, La Barge station).

How hot do summers get in La Barge, WY?

The average high peaks at 83 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 83123 have?

The USDA soil survey maps Poposhia at the center of ZIP 83123: gravelly loam, well drained, pH about 7.8 (slightly alkaline).

Did spring come early in La Barge, WY in 2026?

Spring leaf-out near 83123 came on Apr 15 in 2026, 18 days earlier than the 1991–2020 average (May 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in La Barge, WY?

Long-day onions: the longest day near 83123 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 83123 change?

Yes. The 2012 USDA map put 83123 in zone 3b; the 2023 map puts it in zone 4a. The newer map uses 1991–2020 data and more weather stations.