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

Planting zone for 82190 — Yellowstone National Park, WY

ZIP code 82190 (Yellowstone National Park, Park County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is June 3 and the first fall frost September 14.

Where ZIP 82190 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 frostJun 3
First frostSep 14
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 Yellowstone National Park, 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 Yellowstone National Park, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 3median — 50% chance of a later frost
Safe for tender plantsJune 19only 10% chance of frost after
First fall frostSeptember 14median — 10% chance by Aug 31
Growing season102 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 16 and returns around September 29.

From the NOAA station Yellowstone Park Mammoth, WY — 32 miles away, elevation 6,195 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 82190

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 22 – May 6
SpinachSow outdoors · Apr 22 – May 13
Broccoli, cabbageStart indoors · Mar 25 – Apr 8
Broccoli, cabbageTransplant · May 13 – May 27
Onion setsPlant outdoors · May 6 – May 20
PotatoesPlant outdoors · May 13 – May 27
LettuceSow outdoors · May 6 – May 20
Carrots, beetsSow outdoors · May 13 – May 27
TomatoesStart indoors · Apr 8 – Apr 22
TomatoesTransplant · Jun 10 – Jun 24
Peppers, eggplantStart indoors · Mar 25 – Apr 8
Peppers, eggplantTransplant · Jun 17 – Jul 1
BeansSow outdoors · Jun 10 – Jun 24
Sweet cornSow outdoors · Jun 10 – Jun 24
Cucumbers, squashSow outdoors · Jun 10 – Jun 24
Fall lettuce, spinachSow outdoors · Jul 20 – Aug 3
GarlicPlant cloves · Aug 31 – Oct 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 3) and first fall frost (Sep 14) 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 82190 came on May 14 — 8 days earlier than the 1991–2020 average (May 22).

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 Yellowstone National Park, WY.

Soil in Yellowstone National Park, WY

The soil mapped at the center of ZIP 82190 is Hanks — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter75%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Hanks family-Como, family, moderately deep-Typic Cryorthents, shallow, 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 82190; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Yellowstone National Park, WY

Summer high76 °Faverage high, July
Winter low1 °Faverage low, January
Hot days0days a year at 90 °F or more
Freezing nights271nights a year at 32 °F or less
Growing degree days579base 50 °F — the season’s usable heat
Longest day15 h 33 mindaylight on June 21
Shortest day8 h 49 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation25.6 inper year, rain and melted snow
Snowfall197 inper year; 180 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 28 °F, low 1 °F 28°1° JanFebruary: average high 31 °F, low 2 °F 31°2° FebMarch: average high 39 °F, low 10 °F 39°10° MarApril: average high 46 °F, low 19 °F 46°19° AprMay: average high 55 °F, low 29 °F 55°29° MayJune: average high 65 °F, low 35 °F 65°35° JunJuly: average high 76 °F, low 39 °F 76°39° JulAugust: average high 75 °F, low 37 °F 75°37° AugSeptember: average high 65 °F, low 30 °F 65°30° SepOctober: average high 50 °F, low 22 °F 50°22° OctNovember: average high 35 °F, low 10 °F 35°10° NovDecember: average high 27 °F, low 1 °F 27°1° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.08 in precipitation, 35.6 in snowfall 2.1❄36 JanFebruary: 2.13 in precipitation, 29.9 in snowfall 2.1❄30 FebMarch: 2.24 in precipitation, 27.1 in snowfall 2.2❄27 MarApril: 2.40 in precipitation, 17.1 in snowfall 2.4❄17 AprMay: 2.68 in precipitation, 5.4 in snowfall 2.7❄5 MayJune: 2.42 in precipitation, 0.6 in snowfall 2.4❄1 JunJuly: 1.25 in precipitation 1.3 JulAugust: 1.43 in precipitation 1.4 AugSeptember: 1.70 in precipitation, 0.9 in snowfall 1.7❄1 SepOctober: 2.30 in precipitation, 9 in snowfall 2.3❄9 OctNovember: 2.22 in precipitation, 26.4 in snowfall 2.2❄26 NovDecember: 2.78 in precipitation, 45 in snowfall 2.8❄45 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Old Faithful, WY (10 mi away); precipitation: Old Faithful, WY (10 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.

597584b
West Yellowstone, MT · 33 mi
834334a
Macks Inn, ID · 33 mi
830135a
Moran, WY · 34 mi
834294a
Island Park, ID · 36 mi
590304b
Gardiner, MT · 39 mi
834205a
Ashton, ID · 46 mi
590814a
Silver Gate, MT · 48 mi
834145a
Alta, WY · 48 mi

Wyoming planting zones →

Questions about 82190

What planting zone is ZIP code 82190?

ZIP code 82190 (Yellowstone National Park, 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 Yellowstone National Park, WY?

The median last spring frost (32 °F) near 82190 is June 3; after June 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Yellowstone Park Mammoth station.

When is the first frost in Yellowstone National Park, WY?

The median first fall frost near 82190 is September 14, giving a median frost-free growing season of 102 days.

When should I plant tomatoes in 82190?

Start tomato seeds indoors around Apr 8 – Apr 22 and set transplants outside around Jun 10 – Jun 24, one to three weeks after the median last frost.

How much rain and snow does 82190 get?

About 25.6 inches of precipitation a year and 197 inches of snowfall (NOAA 1991–2020 normals, Old Faithful station).

How hot do summers get in Yellowstone National Park, WY?

The average high peaks at 76 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 82190 have?

The USDA soil survey maps Hanks at the center of ZIP 82190: slightly decomposed plant material, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Yellowstone National Park, WY in 2026?

Spring leaf-out near 82190 came on May 14 in 2026, 8 days earlier than the 1991–2020 average (May 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Yellowstone National Park, WY?

Long-day onions: the longest day near 82190 is 15 h 33 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).