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

Planting zone for 82240 — Torrington, WY

ZIP code 82240 (Torrington, Goshen County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 11 and the first fall frost September 29.

Where ZIP 82240 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 11
First frostSep 29
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 Torrington, 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 Torrington, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 11median — 50% chance of a later frost
Safe for tender plantsMay 26only 10% chance of frost after
First fall frostSeptember 29median — 10% chance by Sep 16
Growing season139 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 30 and returns around October 8.

From the NOAA station Torrington Municipal Airport, WY — 7 miles away, elevation 4,206 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 82240

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 30 – Apr 13
SpinachSow outdoors · Mar 30 – Apr 20
Broccoli, cabbageStart indoors · Mar 2 – Mar 16
Broccoli, cabbageTransplant · Apr 20 – May 4
Onion setsPlant outdoors · Apr 13 – Apr 27
PotatoesPlant outdoors · Apr 20 – May 4
LettuceSow outdoors · Apr 13 – Apr 27
Carrots, beetsSow outdoors · Apr 20 – May 4
TomatoesStart indoors · Mar 16 – Mar 30
TomatoesTransplant · May 18 – Jun 1
Peppers, eggplantStart indoors · Mar 2 – Mar 16
Peppers, eggplantTransplant · May 25 – Jun 8
BeansSow outdoors · May 18 – Jun 1
Sweet cornSow outdoors · May 18 – Jun 1
Cucumbers, squashSow outdoors · May 18 – Jun 1
Fall lettuce, spinachSow outdoors · Aug 4 – Aug 18
GarlicPlant cloves · Sep 15 – Oct 20
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 11) and first fall frost (Sep 29) 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 82240 came on Mar 3 — 31 days earlier than the 1991–2020 average (Apr 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 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 Torrington, WY.

Soil in Torrington, WY

The soil mapped at the center of ZIP 82240 is Valent — fine sand, excessively drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding
pH7.2neutral; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter0.65%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Valent-Dwyer fine sands, hilly.

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 82240; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Torrington, WY

Summer high90 °Faverage high, July
Winter low15 °Faverage low, December
Hot days53days a year at 90 °F or more
Freezing nights172nights a year at 32 °F or less
Growing degree days2,727base 50 °F — the season’s usable heat
Longest day15 h 16 mindaylight on June 21
Shortest day9 h 06 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation12.8 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 42 °F, low 16 °F 42°16° JanFebruary: average high 44 °F, low 17 °F 44°17° FebMarch: average high 54 °F, low 25 °F 54°25° MarApril: average high 61 °F, low 32 °F 61°32° AprMay: average high 70 °F, low 42 °F 70°42° MayJune: average high 83 °F, low 52 °F 83°52° JunJuly: average high 90 °F, low 58 °F 90°58° JulAugust: average high 88 °F, low 56 °F 88°56° AugSeptember: average high 79 °F, low 45 °F 79°45° SepOctober: average high 64 °F, low 33 °F 64°33° OctNovember: average high 51 °F, low 22 °F 51°22° NovDecember: average high 41 °F, low 15 °F 41°15° Dec

Precipitation by month inches

0″1″2″3″January: 0.23 in precipitation 0.2 JanFebruary: 0.29 in precipitation 0.3 FebMarch: 0.66 in precipitation 0.7 MarApril: 1.61 in precipitation 1.6 AprMay: 2.53 in precipitation 2.5 MayJune: 2.12 in precipitation 2.1 JunJuly: 1.73 in precipitation 1.7 JulAugust: 0.97 in precipitation 1.0 AugSeptember: 1.10 in precipitation 1.1 SepOctober: 1.09 in precipitation 1.1 OctNovember: 0.26 in precipitation 0.3 NovDecember: 0.23 in precipitation 0.2 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5a.

693585a
Morrill, NE · 10 mi
822235a
Lingle, WY · 13 mi
822185a
Huntley, WY · 15 mi
822435a
Veteran, WY · 18 mi
693575a
Mitchell, NE · 19 mi
822445a
Yoder, WY · 24 mi
693525a
Lyman, NE · 26 mi
822175a
Hawk Springs, WY · 28 mi

Wyoming planting zones →

Questions about 82240

What planting zone is ZIP code 82240?

ZIP code 82240 (Torrington, 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 Torrington, WY?

The median last spring frost (32 °F) near 82240 is May 11; after May 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Torrington Municipal Airport station.

When is the first frost in Torrington, WY?

The median first fall frost near 82240 is September 29, giving a median frost-free growing season of 139 days.

When should I plant tomatoes in 82240?

Start tomato seeds indoors around Mar 16 – Mar 30 and set transplants outside around May 18 – Jun 1, one to three weeks after the median last frost.

How much rain and snow does 82240 get?

About 12.8 inches of precipitation a year (NOAA 1991–2020 normals, Torrington Municipal Airport station).

How hot do summers get in Torrington, WY?

The average high peaks at 90 °F in July, with about 53 days a year at 90 °F or more.

What kind of soil does 82240 have?

The USDA soil survey maps Valent at the center of ZIP 82240: fine sand, excessively drained, pH about 7.2 (neutral).

Did spring come early in Torrington, WY in 2026?

Spring leaf-out near 82240 came on Mar 3 in 2026, 31 days earlier than the 1991–2020 average (Apr 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Torrington, WY?

Long-day onions: the longest day near 82240 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 82240 change?

Yes. The 2012 USDA map put 82240 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.