Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for Laramie, WY

Laramie, WY is in USDA zones 4a to 5b across its 3 ZIP codes. The median last spring frost is June 2 and the first fall frost September 15.

Laramie on the zone map

Outlined: its 3 ZIP code areas · 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.

Zones4a–5b−30 to −10 °F

ZIP codes3

Last frostJun 2

First frostSep 15

Growing season102 days

4a 1 ZIP 4b 1 ZIP 5b 1 ZIP

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, 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 Laramie

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 82072 came on Mar 31 — 27 days earlier than the 1991–2020 average (Apr 27).

average
Apr 272026
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 4a in Wyoming

431 plants native to the lower 48 states, recorded in Wyoming, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

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 82072 is Fiveoh — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding

pH7.9alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.25%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classFarmland of statewide importance, if irrigatedUSDA classification

Map unit: Fiveoh, cobbly substratum-Joemre fine sandy loams, 1 to 5 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 82072; 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 low8 °Faverage low, January

Hot days4days a year at 90 °F or more

Freezing nights217nights a year at 32 °F or less

Growing degree days1,225base 50 °F — the season’s usable heat

Longest day15 h 09 mindaylight on June 21

Shortest day9 h 11 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation10.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Laramie 2 Nw, WY (7 mi away); precipitation: Laramie 2 Nw, WY (7 mi away). Daylight is calculated from latitude.

ZIP codes in Laramie

Wyoming planting zones →

Questions about Laramie

What planting zone is Laramie, WY?

Laramie, WY is in USDA hardiness zones 4a to 5b on the 2023 map (4a: −30 to −25 °F; 4b: −25 to −20 °F; 5b: −15 to −10 °F).

When is the last frost in Laramie, WY?

The median last spring frost is June 2 and the median first fall frost is September 15 (NOAA 1991–2020 normals, Laramie Regional Airport station).

When can I plant a garden in Laramie, WY?

Cool-season crops like peas and spinach go in around Apr 21 – May 12; tomatoes, peppers, beans and squash after about Jun 9, once frost risk has passed.

What kind of onions grow in Laramie, WY?

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

How much rain and snow does Laramie, WY get?

About 10.9 inches of precipitation a year (NOAA 1991–2020 normals).