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

Planting zone for 82214 — Guernsey, WY

ZIP code 82214 (Guernsey, Platte County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 7 and the first fall frost October 6.

Where ZIP 82214 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 7
First frostOct 6
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 Guernsey, 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 Guernsey, 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 21only 10% chance of frost after
First fall frostOctober 6median — 10% chance by Sep 23
Growing season152 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 28 and returns around October 16.

From the NOAA station Guernsey 2nw, WY — within 1 mile, elevation 4,482 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 82214

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 11 – Aug 25
GarlicPlant cloves · Sep 22 – Oct 27
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 6) 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 82214 came on Mar 1 — 30 days earlier than the 1991–2020 average (Mar 31).

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 Guernsey, WY.

Soil in Guernsey, WY

The soil mapped at the center of ZIP 82214 is Mainter — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Mainter-Keeline fine sandy loams, 6 to 10 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 82214; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Guernsey, WY

Summer high89 °Faverage high, July
Winter low14 °Faverage low, January
Hot days46days a year at 90 °F or more
Freezing nights161nights a year at 32 °F or less
Growing degree days2,732base 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)
Precipitation15.1 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 40 °F, low 14 °F 40°14° JanFebruary: average high 41 °F, low 16 °F 41°16° FebMarch: average high 52 °F, low 25 °F 52°25° MarApril: average high 59 °F, low 32 °F 59°32° AprMay: average high 69 °F, low 43 °F 69°43° MayJune: average high 81 °F, low 53 °F 81°53° JunJuly: average high 89 °F, low 60 °F 89°60° JulAugust: average high 88 °F, low 58 °F 88°58° AugSeptember: average high 78 °F, low 48 °F 78°48° SepOctober: average high 63 °F, low 34 °F 63°34° OctNovember: average high 50 °F, low 23 °F 50°23° NovDecember: average high 40 °F, low 15 °F 40°15° Dec

Precipitation by month inches

0″1″2″3″January: 0.66 in precipitation 0.7 JanFebruary: 0.54 in precipitation 0.5 FebMarch: 0.95 in precipitation 0.9 MarApril: 1.75 in precipitation 1.8 AprMay: 2.85 in precipitation 2.9 MayJune: 2.08 in precipitation 2.1 JunJuly: 1.73 in precipitation 1.7 JulAugust: 1.20 in precipitation 1.2 AugSeptember: 1.20 in precipitation 1.2 SepOctober: 1.29 in precipitation 1.3 OctNovember: 0.51 in precipitation 0.5 NovDecember: 0.34 in precipitation 0.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Guernsey 2nw, WY (within 1 mile); precipitation: Guernsey 2nw, WY (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5a.

822125a
Fort Laramie, WY · 11 mi
822155a
Hartville, WY · 14 mi
822195a
Jay Em, WY · 20 mi
822135a
Glendo, WY · 21 mi
822235a
Lingle, WY · 21 mi
822435a
Veteran, WY · 26 mi
822015a
Wheatland, WY · 27 mi
822445a
Yoder, WY · 30 mi

Wyoming planting zones →

Questions about 82214

What planting zone is ZIP code 82214?

ZIP code 82214 (Guernsey, 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 Guernsey, WY?

The median last spring frost (32 °F) near 82214 is May 7; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Guernsey 2nw station.

When is the first frost in Guernsey, WY?

The median first fall frost near 82214 is October 6, giving a median frost-free growing season of 152 days.

When should I plant tomatoes in 82214?

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 82214 get?

About 15.1 inches of precipitation a year (NOAA 1991–2020 normals, Guernsey 2nw station).

How hot do summers get in Guernsey, WY?

The average high peaks at 89 °F in July, with about 46 days a year at 90 °F or more.

What kind of soil does 82214 have?

The USDA soil survey maps Mainter at the center of ZIP 82214: fine sandy loam, well drained, pH about 7.2 (neutral).

Did spring come early in Guernsey, WY in 2026?

Spring leaf-out near 82214 came on Mar 1 in 2026, 30 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Guernsey, WY?

Long-day onions: the longest day near 82214 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 82214 change?

Yes. The 2012 USDA map put 82214 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.