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

Planting zone for 84313 — Grouse Creek, UT

ZIP code 84313 (Grouse Creek, Box Elder County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is June 3 and the first fall frost September 18.

Where ZIP 84313 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.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostJun 3

First frostSep 18

2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Grouse Creek, UT…

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 Grouse Creek, UT

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 22only 10% chance of frost after

First fall frostSeptember 18median — 10% chance by Sep 3

Growing season105 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 16 and returns around September 30.

From the NOAA station Montello - 7ne, NV — 20 miles away, elevation 4,830 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 84313

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 24 – Aug 7

GarlicPlant cloves · Sep 4 – Oct 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 3) and first fall frost (Sep 18) 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 84313 came on Mar 17 — 13 days earlier than the 1991–2020 average (Mar 30).

average
Mar 302026
Mar 17

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 6b in Utah

549 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 Grouse Creek, UT.

Soil in Grouse Creek, UT

The soil mapped at the center of ZIP 84313 is Saltair — silt loam, very poorly drained.

TextureSilt loama good balance for most vegetables

pH8.5alkaline; most vegetables like 6.0–7.0

DrainageVery poorly drainedconsider raised beds

Organic matter0.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Saltair-Playas association, 0 to 2 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 84313; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Grouse Creek, UT

Summer high94 °Faverage high, July

Winter low9 °Faverage low, January

Hot days67days a year at 90 °F or more

Freezing nights206nights a year at 32 °F or less

Growing degree days2,313base 50 °F — the season’s usable heat

Longest day15 h 10 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)

Precipitation12.1 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: Montello - 7ne, NV (20 mi away); precipitation: Montello - 7ne, NV (20 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

898305b

Montello, NV · 26 mi

843296a

Park Valley, UT · 32 mi

840836b

Wendover, UT · 38 mi

898836b

West Wendover, NV · 44 mi

833126a

Almo, ID · 52 mi

843366a

Snowville, UT · 55 mi

Utah planting zones →

Questions about 84313

What planting zone is ZIP code 84313?

ZIP code 84313 (Grouse Creek, UT) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Grouse Creek, UT?

The median last spring frost (32 °F) near 84313 is June 3; after June 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Montello - 7ne station.

When is the first frost in Grouse Creek, UT?

The median first fall frost near 84313 is September 18, giving a median frost-free growing season of 105 days.

When should I plant tomatoes in 84313?

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 84313 get?

About 12.1 inches of precipitation a year (NOAA 1991–2020 normals, Montello - 7ne station).

How hot do summers get in Grouse Creek, UT?

The average high peaks at 94 °F in July, with about 67 days a year at 90 °F or more.

What kind of soil does 84313 have?

The USDA soil survey maps Saltair at the center of ZIP 84313: silt loam, very poorly drained, pH about 8.5 (alkaline).

Did spring come early in Grouse Creek, UT in 2026?

Spring leaf-out near 84313 came on Mar 17 in 2026, 13 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Grouse Creek, UT?

Long-day onions: the longest day near 84313 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 84313 change?

Yes. The 2012 USDA map put 84313 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.