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

Planting zone for 84340 — Willard, UT

ZIP code 84340 (Willard, Box Elder County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 5 and the first fall frost October 5.

Where ZIP 84340 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 5
First frostOct 5
2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Willard, 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 Willard, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 5median — 50% chance of a later frost
Safe for tender plantsMay 29only 10% chance of frost after
First fall frostOctober 5median — 10% chance by Sep 20
Growing season150 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 18 and returns around October 17.

From the NOAA station Brigham City Waste Plt, UT — 11 miles away, elevation 4,239 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 84340

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 24 – Apr 7
SpinachSow outdoors · Mar 24 – Apr 14
Broccoli, cabbageStart indoors · Feb 24 – Mar 10
Broccoli, cabbageTransplant · Apr 14 – Apr 28
Onion setsPlant outdoors · Apr 7 – Apr 21
PotatoesPlant outdoors · Apr 14 – Apr 28
LettuceSow outdoors · Apr 7 – Apr 21
Carrots, beetsSow outdoors · Apr 14 – Apr 28
TomatoesStart indoors · Mar 10 – Mar 24
TomatoesTransplant · May 12 – May 26
Peppers, eggplantStart indoors · Feb 24 – Mar 10
Peppers, eggplantTransplant · May 19 – Jun 2
BeansSow outdoors · May 12 – May 26
Sweet cornSow outdoors · May 12 – May 26
Cucumbers, squashSow outdoors · May 12 – May 26
Fall lettuce, spinachSow outdoors · Aug 10 – Aug 24
GarlicPlant cloves · Sep 21 – Oct 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Oct 5) 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 84340 came on Mar 16 — 12 days earlier than the 1991–2020 average (Mar 28).

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 Willard, UT.

Soil in Willard, UT

The soil mapped at the center of ZIP 84340 is Saltair — silty clay loam, poorly drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH8.4alkaline; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter0.5%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Playas.

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 84340; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Willard, UT

Summer high91 °Faverage high, July
Winter low18 °Faverage low, January
Hot days45days a year at 90 °F or more
Freezing nights149nights a year at 32 °F or less
Growing degree days2,761base 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)
Precipitation15.5 inper year, rain and melted snow
Snowfall38 inper year; 52 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 36 °F, low 18 °F 36°18° JanFebruary: average high 43 °F, low 22 °F 43°22° FebMarch: average high 54 °F, low 31 °F 54°31° MarApril: average high 62 °F, low 36 °F 62°36° AprMay: average high 71 °F, low 44 °F 71°44° MayJune: average high 82 °F, low 50 °F 82°50° JunJuly: average high 91 °F, low 58 °F 91°58° JulAugust: average high 89 °F, low 56 °F 89°56° AugSeptember: average high 79 °F, low 46 °F 79°46° SepOctober: average high 65 °F, low 36 °F 65°36° OctNovember: average high 50 °F, low 27 °F 50°27° NovDecember: average high 38 °F, low 20 °F 38°20° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 1.53 in precipitation, 12.2 in snowfall 1.5❄12 JanFebruary: 1.23 in precipitation, 7.5 in snowfall 1.2❄8 FebMarch: 1.54 in precipitation, 4.2 in snowfall 1.5❄4 MarApril: 1.69 in precipitation, 1.2 in snowfall 1.7❄1 AprMay: 2.04 in precipitation 2.0 MayJune: 1.13 in precipitation 1.1 JunJuly: 0.39 in precipitation 0.4 JulAugust: 0.61 in precipitation 0.6 AugSeptember: 1.27 in precipitation 1.3 SepOctober: 1.60 in precipitation, 0.5 in snowfall 1.6❄1 OctNovember: 1.07 in precipitation, 4.1 in snowfall 1.1❄4 NovDecember: 1.39 in precipitation, 8.6 in snowfall 1.4❄9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Brigham City Waste Plt, UT (11 mi away); precipitation: Brigham City Waste Plt, UT (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

844047a
Ogden, UT · 10 mi
844146b
Ogden, UT · 12 mi
843246a
Mantua, UT · 14 mi
843026b
Brigham City, UT · 14 mi
843016b
Bear River City, UT · 15 mi
844017a
Ogden, UT · 15 mi
842447a
Ogden, UT · 15 mi
844027a
Ogden, UT · 15 mi

Utah planting zones →

Questions about 84340

What planting zone is ZIP code 84340?

ZIP code 84340 (Willard, 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 Willard, UT?

The median last spring frost (32 °F) near 84340 is May 5; after May 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Brigham City Waste Plt station.

When is the first frost in Willard, UT?

The median first fall frost near 84340 is October 5, giving a median frost-free growing season of 150 days.

When should I plant tomatoes in 84340?

Start tomato seeds indoors around Mar 10 – Mar 24 and set transplants outside around May 12 – May 26, one to three weeks after the median last frost.

How much rain and snow does 84340 get?

About 15.5 inches of precipitation a year and 38 inches of snowfall (NOAA 1991–2020 normals, Brigham City Waste Plt station).

How hot do summers get in Willard, UT?

The average high peaks at 91 °F in July, with about 45 days a year at 90 °F or more.

What kind of soil does 84340 have?

The USDA soil survey maps Saltair at the center of ZIP 84340: silty clay loam, poorly drained, pH about 8.4 (alkaline).

Did spring come early in Willard, UT in 2026?

Spring leaf-out near 84340 came on Mar 16 in 2026, 12 days earlier than the 1991–2020 average (Mar 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Willard, UT?

Long-day onions: the longest day near 84340 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 84340 change?

Yes. The 2012 USDA map put 84340 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.