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

Planting zone for 84784 — Hildale, UT

ZIP code 84784 (Hildale, Washington County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 26 and the first fall frost October 25.

Where ZIP 84784 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 26

First frostOct 25

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 Hildale, 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 Hildale, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 26median — 50% chance of a later frost

Safe for tender plantsMay 15only 10% chance of frost after

First fall frostOctober 25median — 10% chance by Oct 11

Growing season180 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 10 and returns around November 5.

From the NOAA station Colorado City, AZ — 2 miles away, elevation 5,000 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 84784

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 15 – Mar 29

SpinachSow outdoors · Mar 15 – Apr 5

Broccoli, cabbageStart indoors · Feb 15 – Mar 1

Broccoli, cabbageTransplant · Apr 5 – Apr 19

Onion setsPlant outdoors · Mar 29 – Apr 12

PotatoesPlant outdoors · Apr 5 – Apr 19

LettuceSow outdoors · Mar 29 – Apr 12

Carrots, beetsSow outdoors · Apr 5 – Apr 19

TomatoesStart indoors · Mar 1 – Mar 15

TomatoesTransplant · May 3 – May 17

Peppers, eggplantStart indoors · Feb 15 – Mar 1

Peppers, eggplantTransplant · May 10 – May 24

BeansSow outdoors · May 3 – May 17

Sweet cornSow outdoors · May 3 – May 17

Cucumbers, squashSow outdoors · May 3 – May 17

Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13

GarlicPlant cloves · Oct 11 – Nov 15

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 26) and first fall frost (Oct 25) 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 84784 came on Feb 24 — 14 days earlier than the 1991–2020 average (Mar 10).

average
Mar 102026
Feb 24

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 Hildale, UT.

Soil in Hildale, UT

The soil mapped at the center of ZIP 84784 is Redbank — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.75%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Redbank fine sandy 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 84784; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hildale, UT

Summer high95 °Faverage high, July

Winter low24 °Faverage low, December

Hot days72days a year at 90 °F or more

Freezing nights120nights a year at 32 °F or less

Growing degree days3,812base 50 °F — the season’s usable heat

Longest day14 h 42 mindaylight on June 21

Shortest day9 h 37 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation14.3 inper year, rain and melted snow

Snowfall12 inper year; 9 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: Colorado City, AZ (2 mi away); precipitation: Colorado City, AZ (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

847638a

Rockville, UT · 10 mi

860217b

Colorado City, AZ · 11 mi

847676b

Springdale, UT · 13 mi

847378b

Hurricane, UT · 15 mi

847557a

Mount Carmel, UT · 18 mi

847796b

Virgin, UT · 23 mi

847586b

Orderville, UT · 24 mi

860227a

Fredonia, AZ · 28 mi

Utah planting zones →

Questions about 84784

What planting zone is ZIP code 84784?

ZIP code 84784 (Hildale, 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 Hildale, UT?

The median last spring frost (32 °F) near 84784 is April 26; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Colorado City station.

When is the first frost in Hildale, UT?

The median first fall frost near 84784 is October 25, giving a median frost-free growing season of 180 days.

When should I plant tomatoes in 84784?

Start tomato seeds indoors around Mar 1 – Mar 15 and set transplants outside around May 3 – May 17, one to three weeks after the median last frost.

How much rain and snow does 84784 get?

About 14.3 inches of precipitation a year and 12 inches of snowfall (NOAA 1991–2020 normals, Colorado City station).

How hot do summers get in Hildale, UT?

The average high peaks at 95 °F in July, with about 72 days a year at 90 °F or more.

What kind of soil does 84784 have?

The USDA soil survey maps Redbank at the center of ZIP 84784: fine sandy loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Hildale, UT in 2026?

Spring leaf-out near 84784 came on Feb 24 in 2026, 14 days earlier than the 1991–2020 average (Mar 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hildale, UT?

Intermediate onions: the longest day near 84784 is 14 h 42 min, so day-neutral types bulb best; long-day varieties may not bulb fully.