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

Planting zone for 82442 — Ten Sleep, WY

ZIP code 82442 (Ten Sleep, Washakie County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 22 and the first fall frost September 18.

Where ZIP 82442 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 22
First frostSep 18
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 Ten Sleep, 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 Ten Sleep, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 22median — 50% chance of a later frost
Safe for tender plantsJune 7only 10% chance of frost after
First fall frostSeptember 18median — 10% chance by Sep 4
Growing season117 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 9 and returns around September 28.

From the NOAA station Tensleep 16sse, WY — 7 miles away, elevation 4,682 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 82442

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 10 – Apr 24
SpinachSow outdoors · Apr 10 – May 1
Broccoli, cabbageStart indoors · Mar 13 – Mar 27
Broccoli, cabbageTransplant · May 1 – May 15
Onion setsPlant outdoors · Apr 24 – May 8
PotatoesPlant outdoors · May 1 – May 15
LettuceSow outdoors · Apr 24 – May 8
Carrots, beetsSow outdoors · May 1 – May 15
TomatoesStart indoors · Mar 27 – Apr 10
TomatoesTransplant · May 29 – Jun 12
Peppers, eggplantStart indoors · Mar 13 – Mar 27
Peppers, eggplantTransplant · Jun 5 – Jun 19
BeansSow outdoors · May 29 – Jun 12
Sweet cornSow outdoors · May 29 – Jun 12
Cucumbers, squashSow outdoors · May 29 – Jun 12
Fall lettuce, spinachSow outdoors · Jul 24 – Aug 7
GarlicPlant cloves · Sep 4 – Oct 9
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 22) and first fall frost (Sep 18) 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 82442 came on Mar 18 — 25 days earlier than the 1991–2020 average (Apr 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 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.

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 98

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 249

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 161

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 Ten Sleep, WY.

Soil in Ten Sleep, WY

The soil mapped at the center of ZIP 82442 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 matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Kishona-Shingle-Rock outcrop association.

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 82442; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ten Sleep, WY

Summer high86 °Faverage high, July
Winter low1 °Faverage low, January
Hot days26days a year at 90 °F or more
Freezing nights213nights a year at 32 °F or less
Growing degree days1,795base 50 °F — the season’s usable heat
Longest day15 h 29 mindaylight on June 21
Shortest day8 h 54 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation14 inper year, rain and melted snow
Snowfall63 inper year; 118 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 34 °F, low 1 °F 34°1° JanFebruary: average high 36 °F, low 5 °F 36°5° FebMarch: average high 47 °F, low 19 °F 47°19° MarApril: average high 55 °F, low 27 °F 55°27° AprMay: average high 65 °F, low 37 °F 65°37° MayJune: average high 76 °F, low 46 °F 76°46° JunJuly: average high 86 °F, low 52 °F 86°52° JulAugust: average high 84 °F, low 48 °F 84°48° AugSeptember: average high 73 °F, low 38 °F 73°38° SepOctober: average high 58 °F, low 27 °F 58°27° OctNovember: average high 45 °F, low 14 °F 45°14° NovDecember: average high 35 °F, low 3 °F 35°3° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 0.59 in precipitation, 10.2 in snowfall 0.6❄10 JanFebruary: 0.73 in precipitation, 10.5 in snowfall 0.7❄11 FebMarch: 1.12 in precipitation, 9.4 in snowfall 1.1❄9 MarApril: 1.70 in precipitation, 6.4 in snowfall 1.7❄6 AprMay: 2.31 in precipitation, 0.9 in snowfall 2.3❄1 MayJune: 1.45 in precipitation 1.4 JunJuly: 0.97 in precipitation 1.0 JulAugust: 0.76 in precipitation 0.8 AugSeptember: 1.25 in precipitation, 0.3 in snowfall 1.3 SepOctober: 1.45 in precipitation, 5.2 in snowfall 1.4❄5 OctNovember: 0.83 in precipitation, 8.6 in snowfall 0.8❄9 NovDecember: 0.81 in precipitation, 11.2 in snowfall 0.8❄11 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Tensleep 16sse, WY (7 mi away); precipitation: Tensleep 16sse, WY (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

824285a
Hyattville, WY · 29 mi
824324b
Manderson, WY · 33 mi
826395a
Kaycee, WY · 34 mi
828345a
Buffalo, WY · 38 mi
826305a
Arminto, WY · 40 mi
824014b
Worland, WY · 42 mi
824304b
Kirby, WY · 43 mi
824415a
Shell, WY · 46 mi

Wyoming planting zones →

Questions about 82442

What planting zone is ZIP code 82442?

ZIP code 82442 (Ten Sleep, 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 Ten Sleep, WY?

The median last spring frost (32 °F) near 82442 is May 22; after June 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Tensleep 16sse station.

When is the first frost in Ten Sleep, WY?

The median first fall frost near 82442 is September 18, giving a median frost-free growing season of 117 days.

When should I plant tomatoes in 82442?

Start tomato seeds indoors around Mar 27 – Apr 10 and set transplants outside around May 29 – Jun 12, one to three weeks after the median last frost.

How much rain and snow does 82442 get?

About 14 inches of precipitation a year and 63 inches of snowfall (NOAA 1991–2020 normals, Tensleep 16sse station).

How hot do summers get in Ten Sleep, WY?

The average high peaks at 86 °F in July, with about 26 days a year at 90 °F or more.

What kind of soil does 82442 have?

The USDA soil survey maps Kishona at the center of ZIP 82442: loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Ten Sleep, WY in 2026?

Spring leaf-out near 82442 came on Mar 18 in 2026, 25 days earlier than the 1991–2020 average (Apr 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ten Sleep, WY?

Long-day onions: the longest day near 82442 is 15 h 29 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 82442 change?

Yes. The 2012 USDA map put 82442 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.