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

Planting zone for 84029 — Grantsville, UT

ZIP code 84029 (Grantsville, 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 14.

Where ZIP 84029 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 14
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 Grantsville, 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 Grantsville, 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 19only 10% chance of frost after
First fall frostOctober 14median — 10% chance by Sep 30
Growing season164 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 17 and returns around October 25.

From the NOAA station Grantsville 2w, UT — 24 miles away, elevation 4,551 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 84029

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 19 – Sep 2
GarlicPlant cloves · Sep 30 – Nov 4
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 2) and first fall frost (Oct 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 84029 came on Mar 18 — 21 days earlier than the 1991–2020 average (Apr 8).

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.

Trees 30

American beech80 ft · blooms mid spring · low shade tolerance · to −44 °FArizona cypress50 ft · blooms spring · low shade tolerance · to −23 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack walnut100 ft · blooms late spring · high shade tolerance · to −28 °F

Shrubs 112

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 plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °F

Wildflowers & perennials 254

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 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 154

alkali 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 °Farctic bluegrass2 ft · high shade tolerance · to −62 °F

Vines 3

trumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °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 Grantsville, UT.

Soil in Grantsville, UT

The soil mapped at the center of ZIP 84029 is Amtoft — very cobbly loam, somewhat excessively drained.

TextureVery cobbly loama good balance for most vegetables
pH8.5alkaline; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Amtoft-Rock outcrop complex, 30 to 70 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 84029; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Grantsville, UT

Summer high92 °Faverage high, July
Winter low19 °Faverage low, January
Hot days58days a year at 90 °F or more
Freezing nights142nights a year at 32 °F or less
Growing degree days3,142base 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)
Precipitation37.2 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 19 °F 37°19° JanFebruary: average high 43 °F, low 23 °F 43°23° FebMarch: average high 53 °F, low 30 °F 53°30° MarApril: average high 61 °F, low 36 °F 61°36° AprMay: average high 71 °F, low 45 °F 71°45° MayJune: average high 82 °F, low 54 °F 82°54° JunJuly: average high 92 °F, low 64 °F 92°64° JulAugust: average high 90 °F, low 62 °F 90°62° AugSeptember: average high 79 °F, low 50 °F 79°50° SepOctober: average high 64 °F, low 38 °F 64°38° OctNovember: average high 49 °F, low 28 °F 49°28° NovDecember: average high 38 °F, low 20 °F 38°20° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.37 in precipitation 4.4 JanFebruary: 3.77 in precipitation 3.8 FebMarch: 3.95 in precipitation 4.0 MarApril: 4.39 in precipitation 4.4 AprMay: 3.91 in precipitation 3.9 MayJune: 1.98 in precipitation 2.0 JunJuly: 1.21 in precipitation 1.2 JulAugust: 1.37 in precipitation 1.4 AugSeptember: 2.05 in precipitation 2.0 SepOctober: 3.04 in precipitation 3.0 OctNovember: 3.16 in precipitation 3.2 NovDecember: 3.97 in precipitation 4.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Grantsville 2w, UT (24 mi away); precipitation: Mining Fork, UT (19 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.

840226b
Dugway, UT · 23 mi
840696a
Rush Valley, UT · 28 mi
840747a
Tooele, UT · 34 mi
840716b
Stockton, UT · 39 mi
840067a
Bingham Canyon, UT · 44 mi
840836b
Wendover, UT · 45 mi
840447b
Magna, UT · 45 mi
840967a
Herriman, UT · 45 mi

Utah planting zones →

Questions about 84029

What planting zone is ZIP code 84029?

ZIP code 84029 (Grantsville, 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 Grantsville, UT?

The median last spring frost (32 °F) near 84029 is May 2; after May 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Grantsville 2w station.

When is the first frost in Grantsville, UT?

The median first fall frost near 84029 is October 14, giving a median frost-free growing season of 164 days.

When should I plant tomatoes in 84029?

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 84029 get?

About 37.2 inches of precipitation a year (NOAA 1991–2020 normals, Mining Fork station).

How hot do summers get in Grantsville, UT?

The average high peaks at 92 °F in July, with about 58 days a year at 90 °F or more.

What kind of soil does 84029 have?

The USDA soil survey maps Amtoft at the center of ZIP 84029: very cobbly loam, somewhat excessively drained, pH about 8.5 (alkaline).

Did spring come early in Grantsville, UT in 2026?

Spring leaf-out near 84029 came on Mar 18 in 2026, 21 days earlier than the 1991–2020 average (Apr 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Grantsville, UT?

Long-day onions: the longest day near 84029 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).