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

Planting zone for 82070 — Laramie, WY

ZIP code 82070 (Laramie, Albany County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is June 2 and the first fall frost September 15.

Where ZIP 82070 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 2
First frostSep 15
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 Laramie, 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 Laramie, WY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 2median — 50% chance of a later frost
Safe for tender plantsJune 18only 10% chance of frost after
First fall frostSeptember 15median — 10% chance by Sep 3
Growing season102 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 20 and returns around September 24.

From the NOAA station Laramie Regional Airport, WY — 11 miles away, elevation 7,267 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 82070

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 21 – May 5
SpinachSow outdoors · Apr 21 – May 12
Broccoli, cabbageStart indoors · Mar 24 – Apr 7
Broccoli, cabbageTransplant · May 12 – May 26
Onion setsPlant outdoors · May 5 – May 19
PotatoesPlant outdoors · May 12 – May 26
LettuceSow outdoors · May 5 – May 19
Carrots, beetsSow outdoors · May 12 – May 26
TomatoesStart indoors · Apr 7 – Apr 21
TomatoesTransplant · Jun 9 – Jun 23
Peppers, eggplantStart indoors · Mar 24 – Apr 7
Peppers, eggplantTransplant · Jun 16 – Jun 30
BeansSow outdoors · Jun 9 – Jun 23
Sweet cornSow outdoors · Jun 9 – Jun 23
Cucumbers, squashSow outdoors · Jun 9 – Jun 23
Fall lettuce, spinachSow outdoors · Jul 21 – Aug 4
GarlicPlant cloves · Sep 1 – Oct 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 2) and first fall frost (Sep 15) 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 82070 came on Mar 23 — 35 days earlier than the 1991–2020 average (Apr 27).

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 Laramie, WY.

Soil in Laramie, WY

The soil mapped at the center of ZIP 82070 is Bosler — 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 matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Bosler-Borollic Camborthids complex, 0 to 8 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 82070; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Laramie, WY

Summer high81 °Faverage high, July
Winter low10 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights212nights a year at 32 °F or less
Growing degree days1,371base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 12 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation10.5 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 33 °F, low 10 °F 33°10° JanFebruary: average high 36 °F, low 12 °F 36°12° FebMarch: average high 45 °F, low 19 °F 45°19° MarApril: average high 51 °F, low 25 °F 51°25° AprMay: average high 62 °F, low 33 °F 62°33° MayJune: average high 74 °F, low 42 °F 74°42° JunJuly: average high 81 °F, low 49 °F 81°49° JulAugust: average high 79 °F, low 47 °F 79°47° AugSeptember: average high 70 °F, low 39 °F 70°39° SepOctober: average high 56 °F, low 28 °F 56°28° OctNovember: average high 43 °F, low 18 °F 43°18° NovDecember: average high 33 °F, low 10 °F 33°10° Dec

Precipitation by month inches

0″1″2″January: 0.28 in precipitation 0.3 JanFebruary: 0.32 in precipitation 0.3 FebMarch: 0.48 in precipitation 0.5 MarApril: 1.04 in precipitation 1.0 AprMay: 1.75 in precipitation 1.8 MayJune: 1.49 in precipitation 1.5 JunJuly: 1.34 in precipitation 1.3 JulAugust: 1.14 in precipitation 1.1 AugSeptember: 1.11 in precipitation 1.1 SepOctober: 0.83 in precipitation 0.8 OctNovember: 0.42 in precipitation 0.4 NovDecember: 0.32 in precipitation 0.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Laramie Regional Airport, WY (11 mi away); precipitation: Laramie Regional Airport, WY (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

820845b
Tie Siding, WY · 21 mi
820724a
Laramie, WY · 21 mi
820735b
Laramie, WY · 21 mi
820555a
Centennial, WY · 24 mi
820525b
Buford, WY · 27 mi
805455a
Red Feather Lakes, CO · 27 mi
820514a
Bosler, WY · 28 mi
804344b
Cowdrey, CO · 32 mi

All 3 ZIP codes in Laramie → · Wyoming planting zones →

Questions about 82070

What planting zone is ZIP code 82070?

ZIP code 82070 (Laramie, 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 Laramie, WY?

The median last spring frost (32 °F) near 82070 is June 2; after June 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Laramie Regional Airport station.

When is the first frost in Laramie, WY?

The median first fall frost near 82070 is September 15, giving a median frost-free growing season of 102 days.

When should I plant tomatoes in 82070?

Start tomato seeds indoors around Apr 7 – Apr 21 and set transplants outside around Jun 9 – Jun 23, one to three weeks after the median last frost.

How much rain and snow does 82070 get?

About 10.5 inches of precipitation a year (NOAA 1991–2020 normals, Laramie Regional Airport station).

How hot do summers get in Laramie, WY?

The average high peaks at 81 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 82070 have?

The USDA soil survey maps Bosler at the center of ZIP 82070: fine sandy loam, well drained, pH about 7.2 (neutral).

Did spring come early in Laramie, WY in 2026?

Spring leaf-out near 82070 came on Mar 23 in 2026, 35 days earlier than the 1991–2020 average (Apr 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Laramie, WY?

Long-day onions: the longest day near 82070 is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).