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

Planting zone for 84074 — Tooele, UT

ZIP code 84074 (Tooele, Tooele County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 2 and the first fall frost October 16.

Where ZIP 84074 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostMay 2

First frostOct 16

2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Tooele, 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 Tooele, UT

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 2median — 50% chance of a later frost

Safe for tender plantsMay 28only 10% chance of frost after

First fall frostOctober 16median — 10% chance by Oct 2

Growing season165 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around October 27.

From the NOAA station Tooele, UT — 3 miles away, elevation 4,944 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 84074

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 21 – Apr 4

SpinachSow outdoors · Mar 21 – Apr 11

Broccoli, cabbageStart indoors · Feb 21 – Mar 7

Broccoli, cabbageTransplant · Apr 11 – Apr 25

Onion setsPlant outdoors · Apr 4 – Apr 18

PotatoesPlant outdoors · Apr 11 – Apr 25

LettuceSow outdoors · Apr 4 – Apr 18

Carrots, beetsSow outdoors · Apr 11 – Apr 25

TomatoesStart indoors · Mar 7 – Mar 21

TomatoesTransplant · May 9 – May 23

Peppers, eggplantStart indoors · Feb 21 – Mar 7

Peppers, eggplantTransplant · May 16 – May 30

BeansSow outdoors · May 9 – May 23

Sweet cornSow outdoors · May 9 – May 23

Cucumbers, squashSow outdoors · May 9 – May 23

Fall lettuce, spinachSow outdoors · Aug 21 – Sep 4

GarlicPlant cloves · Oct 2 – Nov 6

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 2) and first fall frost (Oct 16) 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 84074 came on Mar 1 — 23 days earlier than the 1991–2020 average (Mar 24).

average
Mar 242026
Mar 1

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 7a in Utah

561 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Tooele, UT.

Soil in Tooele, UT

The soil mapped at the center of ZIP 84074 is Erda — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH7.9alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Erda silt loam, 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 84074; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Tooele, UT

Summer high91 °Faverage high, July

Winter low21 °Faverage low, January

Hot days56days a year at 90 °F or more

Freezing nights128nights a year at 32 °F or less

Growing degree days3,287base 50 °F — the season’s usable heat

Longest day15 h 05 mindaylight on June 21

Shortest day9 h 16 mindaylight on December 21

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

Precipitation18.4 inper year, rain and melted snow

Snowfall75 inper year; 69 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Tooele, UT (3 mi away); precipitation: Tooele, UT (3 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.

840067a

Bingham Canyon, UT · 9 mi

840967a

Herriman, UT · 13 mi

840817b

West Jordan, UT · 14 mi

840447b

Magna, UT · 14 mi

841187b

Salt Lake City, UT · 15 mi

840097a

South Jordan, UT · 15 mi

840716b

Stockton, UT · 16 mi

841287b

West Valley City, UT · 16 mi

Utah planting zones →

Questions about 84074

What planting zone is ZIP code 84074?

ZIP code 84074 (Tooele, UT) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Tooele, UT?

The median last spring frost (32 °F) near 84074 is May 2; after May 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Tooele station.

When is the first frost in Tooele, UT?

The median first fall frost near 84074 is October 16, giving a median frost-free growing season of 165 days.

When should I plant tomatoes in 84074?

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

How much rain and snow does 84074 get?

About 18.4 inches of precipitation a year and 75 inches of snowfall (NOAA 1991–2020 normals, Tooele station).

How hot do summers get in Tooele, UT?

The average high peaks at 91 °F in July, with about 56 days a year at 90 °F or more.

What kind of soil does 84074 have?

The USDA soil survey maps Erda at the center of ZIP 84074: silt loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Tooele, UT in 2026?

Spring leaf-out near 84074 came on Mar 1 in 2026, 23 days earlier than the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Tooele, UT?

Long-day onions: the longest day near 84074 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).