Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for 84056 — Hill Afb, UT

ZIP code 84056 (Hill Afb, Davis County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 29 and the first fall frost October 20.

Where ZIP 84056 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 frostApr 29

First frostOct 20

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 Hill Afb, 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 Hill Afb, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 29median — 50% chance of a later frost

Safe for tender plantsMay 25only 10% chance of frost after

First fall frostOctober 20median — 10% chance by Oct 1

Growing season172 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around November 2.

From the NOAA station Weber Basin Pump Plt 3, UT — 4 miles away, elevation 4,902 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 84056

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 18 – Apr 1

SpinachSow outdoors · Mar 18 – Apr 8

Broccoli, cabbageStart indoors · Feb 18 – Mar 4

Broccoli, cabbageTransplant · Apr 8 – Apr 22

Onion setsPlant outdoors · Apr 1 – Apr 15

PotatoesPlant outdoors · Apr 8 – Apr 22

LettuceSow outdoors · Apr 1 – Apr 15

Carrots, beetsSow outdoors · Apr 8 – Apr 22

TomatoesStart indoors · Mar 4 – Mar 18

TomatoesTransplant · May 6 – May 20

Peppers, eggplantStart indoors · Feb 18 – Mar 4

Peppers, eggplantTransplant · May 13 – May 27

BeansSow outdoors · May 6 – May 20

Sweet cornSow outdoors · May 6 – May 20

Cucumbers, squashSow outdoors · May 6 – May 20

Fall lettuce, spinachSow outdoors · Aug 25 – Sep 8

GarlicPlant cloves · Oct 6 – Nov 10

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Oct 20) 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 84056 came on Mar 9 — 21 days earlier than the 1991–2020 average (Mar 30).

average
Mar 302026
Mar 9

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 Hill Afb, UT.

Soil in Hill Afb, UT

The soil mapped at the center of ZIP 84056 is Preston — fine sand, excessively drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding

pH7.2neutral; most vegetables like 6.0–7.0

DrainageExcessively drainednatural drainage class

Organic matter0.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classFarmland of unique importanceUSDA classification

Map unit: Preston fine sand, 1 to 10 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 84056; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hill Afb, UT

Summer high92 °Faverage high, July

Winter low20 °Faverage low, January

Hot days41days a year at 90 °F or more

Freezing nights132nights a year at 32 °F or less

Growing degree days3,017base 50 °F — the season’s usable heat

Longest day15 h 08 mindaylight on June 21

Shortest day9 h 12 mindaylight on December 21

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

Precipitation26.2 inper year, rain and melted snow

Snowfall23 inper year; 25 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: Weber Basin Pump Plt 3, UT (4 mi away); precipitation: Weber Basin Pump Plt 3, UT (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

840167a

Clearfield, UT · 2 mi

844057a

Ogden, UT · 2 mi

840157a

Clearfield, UT · 4 mi

Utah planting zones →

Questions about 84056

What planting zone is ZIP code 84056?

ZIP code 84056 (Hill Afb, 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 Hill Afb, UT?

The median last spring frost (32 °F) near 84056 is April 29; after May 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Weber Basin Pump Plt 3 station.

When is the first frost in Hill Afb, UT?

The median first fall frost near 84056 is October 20, giving a median frost-free growing season of 172 days.

When should I plant tomatoes in 84056?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 84056 get?

About 26.2 inches of precipitation a year and 23 inches of snowfall (NOAA 1991–2020 normals, Weber Basin Pump Plt 3 station).

How hot do summers get in Hill Afb, UT?

The average high peaks at 92 °F in July, with about 41 days a year at 90 °F or more.

What kind of soil does 84056 have?

The USDA soil survey maps Preston at the center of ZIP 84056: fine sand, excessively drained, pH about 7.2 (neutral).

Did spring come early in Hill Afb, UT in 2026?

Spring leaf-out near 84056 came on Mar 9 in 2026, 21 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hill Afb, UT?

Long-day onions: the longest day near 84056 is 15 h 08 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).