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

Planting zone for 84781 — Pine Valley, UT

ZIP code 84781 (Pine Valley, Washington County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 9 and the first fall frost November 5.

Where ZIP 84781 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.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostApr 9

First frostNov 5

2012 zone7a

Was 7a on the 2012 map — half a zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Pine Valley, 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 Pine Valley, 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 — 11 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 84781

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 84781 came on Mar 12 — 32 days earlier than the 1991–2020 average (Apr 13).

average
Apr 132026
Mar 12

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 6b in Utah

549 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 Pine Valley, UT.

Soil in Pine Valley, UT

The soil mapped at the center of ZIP 84781 is Catgulch family — very gravelly sandy loam, somewhat excessively drained.

TextureVery gravelly sandy loamdrains and warms fast; dries out and needs more feeding

pH7.0neutral; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter2%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Rock outcrop-Catgulch family 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 84781; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pine Valley, 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 45 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

Precipitation25.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Veyo Powerhouse, UT (11 mi away); precipitation: Gardner Peak, UT (within 1 mile). 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.

New Harmony, UT · 12 mi

847468b

Leeds, UT · 13 mi

847838a

Dammeron Valley, UT · 15 mi

847748b

Toquerville, UT · 15 mi

847206b

Cedar City, UT · 17 mi

847458a

La Verkin, UT · 17 mi

Utah planting zones →

Questions about 84781

What planting zone is ZIP code 84781?

ZIP code 84781 (Pine Valley, UT) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Pine Valley, UT?

The median last spring frost (32 °F) near 84781 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 Pine Valley, UT?

The median first fall frost near 84781 is November 5, giving a median frost-free growing season of 207 days.

When should I plant tomatoes in 84781?

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 84781 get?

About 25.1 inches of precipitation a year (NOAA 1991–2020 normals, Gardner Peak station).

How hot do summers get in Pine Valley, 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 84781 have?

The USDA soil survey maps Catgulch family at the center of ZIP 84781: very gravelly sandy loam, somewhat excessively drained, pH about 7.0 (neutral).

Did spring come early in Pine Valley, UT in 2026?

Spring leaf-out near 84781 came on Mar 12 in 2026, 32 days earlier than the 1991–2020 average (Apr 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pine Valley, UT?

Intermediate onions: the longest day near 84781 is 14 h 45 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 84781 change?

Yes. The 2012 USDA map put 84781 in zone 7a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.