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

Planting zone for 84733 — Gunlock, UT

ZIP code 84733 (Gunlock, Washington County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is April 9 and the first fall frost November 5.

Where ZIP 84733 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.

Zone8a10 to 15 °F

Coldest night−12.2 to −9.4 °C

Last frostApr 9

First frostNov 5

2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Gunlock, 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 Gunlock, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 9median — 50% chance of a later frost

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

First fall frostNovember 5median — 10% chance by Oct 21

Growing season207 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 18 and returns around November 16.

From the NOAA station Veyo Powerhouse, UT — 9 miles away, elevation 4,600 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 84733

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 26 – Mar 12

SpinachSow outdoors · Feb 26 – Mar 19

Broccoli, cabbageStart indoors · Jan 29 – Feb 12

Broccoli, cabbageTransplant · Mar 19 – Apr 2

Onion setsPlant outdoors · Mar 12 – Mar 26

PotatoesPlant outdoors · Mar 19 – Apr 2

LettuceSow outdoors · Mar 12 – Mar 26

Carrots, beetsSow outdoors · Mar 19 – Apr 2

TomatoesStart indoors · Feb 12 – Feb 26

TomatoesTransplant · Apr 16 – Apr 30

Peppers, eggplantStart indoors · Jan 29 – Feb 12

Peppers, eggplantTransplant · Apr 23 – May 7

BeansSow outdoors · Apr 16 – Apr 30

Sweet cornSow outdoors · Apr 16 – Apr 30

Cucumbers, squashSow outdoors · Apr 16 – Apr 30

Fall lettuce, spinachSow outdoors · Sep 10 – Sep 24

GarlicPlant cloves · Oct 22 – Nov 26

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 9) and first fall frost (Nov 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 84733 came on Feb 5 — 17 days earlier than the 1991–2020 average (Feb 22).

average
Feb 222026
Feb 5

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 8a in Utah

575 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 Gunlock, UT.

Soil in Gunlock, UT

The soil mapped at the center of ZIP 84733 is Menefee — channery loam, well drained.

TextureChannery loama good balance for most vegetables

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Menefee-Rock outcrop complex, 25 to 60 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 84733; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Gunlock, UT

Summer high92 °Faverage high, July

Winter low28 °Faverage low, January

Hot days65days a year at 90 °F or more

Freezing nights98nights a year at 32 °F or less

Growing degree days3,821base 50 °F — the season’s usable heat

Longest day14 h 44 mindaylight on June 21

Shortest day9 h 35 mindaylight on December 21

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

Precipitation13.7 inper year, rain and melted snow

Snowfall5 inper year; 1 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: Veyo Powerhouse, UT (9 mi away); precipitation: Gunlock Ph, UT (4 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.

847838a

Dammeron Valley, UT · 7 mi

Santa Clara, UT · 12 mi

847708b

Saint George, UT · 15 mi

847257a

Enterprise, UT · 17 mi

847718b

Saint George, UT · 18 mi

847918b

Saint George, UT · 18 mi

Utah planting zones →

Questions about 84733

What planting zone is ZIP code 84733?

ZIP code 84733 (Gunlock, UT) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Gunlock, UT?

The median last spring frost (32 °F) near 84733 is April 9; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Veyo Powerhouse station.

When is the first frost in Gunlock, UT?

The median first fall frost near 84733 is November 5, giving a median frost-free growing season of 207 days.

When should I plant tomatoes in 84733?

Start tomato seeds indoors around Feb 12 – Feb 26 and set transplants outside around Apr 16 – Apr 30, one to three weeks after the median last frost.

How much rain and snow does 84733 get?

About 13.7 inches of precipitation a year and 5 inches of snowfall (NOAA 1991–2020 normals, Gunlock Ph station).

How hot do summers get in Gunlock, UT?

The average high peaks at 92 °F in July, with about 65 days a year at 90 °F or more.

What kind of soil does 84733 have?

The USDA soil survey maps Menefee at the center of ZIP 84733: channery loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Gunlock, UT in 2026?

Spring leaf-out near 84733 came on Feb 5 in 2026, 17 days earlier than the 1991–2020 average (Feb 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Gunlock, UT?

Intermediate onions: the longest day near 84733 is 14 h 44 min, so day-neutral types bulb best; long-day varieties may not bulb fully.