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

Planting zone for 84757 — New Harmony, UT

ZIP code 84757 (New Harmony, Washington County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 9 and the first fall frost October 11.

Where ZIP 84757 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 9
First frostOct 11
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 New Harmony, 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 New Harmony, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 9median — 50% chance of a later frost
Safe for tender plantsMay 29only 10% chance of frost after
First fall frostOctober 11median — 10% chance by Sep 27
Growing season155 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 22.

From the NOAA station New Harmony, UT — within 1 mile, elevation 5,168 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 84757

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 28 – Apr 11
SpinachSow outdoors · Mar 28 – Apr 18
Broccoli, cabbageStart indoors · Feb 28 – Mar 14
Broccoli, cabbageTransplant · Apr 18 – May 2
Onion setsPlant outdoors · Apr 11 – Apr 25
PotatoesPlant outdoors · Apr 18 – May 2
LettuceSow outdoors · Apr 11 – Apr 25
Carrots, beetsSow outdoors · Apr 18 – May 2
TomatoesStart indoors · Mar 14 – Mar 28
TomatoesTransplant · May 16 – May 30
Peppers, eggplantStart indoors · Feb 28 – Mar 14
Peppers, eggplantTransplant · May 23 – Jun 6
BeansSow outdoors · May 16 – May 30
Sweet cornSow outdoors · May 16 – May 30
Cucumbers, squashSow outdoors · May 16 – May 30
Fall lettuce, spinachSow outdoors · Aug 16 – Aug 30
GarlicPlant cloves · Sep 27 – Nov 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 9) and first fall frost (Oct 11) 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 84757 came on Feb 28 — 12 days earlier than the 1991–2020 average (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 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 New Harmony, UT.

Soil in New Harmony, UT

The soil mapped at the center of ZIP 84757 is Nehar — very stony sandy loam, well drained.

TextureVery stony sandy loamdrains and warms fast; dries out and needs more feeding
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Nehar-Ildefonso complex, 3 to 30 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 84757; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in New Harmony, UT

Summer high90 °Faverage high, July
Winter low21 °Faverage low, January
Hot days36days a year at 90 °F or more
Freezing nights148nights a year at 32 °F or less
Growing degree days2,837base 50 °F — the season’s usable heat
Longest day14 h 45 mindaylight on June 21
Shortest day9 h 34 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation17.6 inper year, rain and melted snow
Snowfall38 inper year; 21 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 45 °F, low 21 °F 45°21° JanFebruary: average high 48 °F, low 24 °F 48°24° FebMarch: average high 56 °F, low 29 °F 56°29° MarApril: average high 63 °F, low 34 °F 63°34° AprMay: average high 73 °F, low 42 °F 73°42° MayJune: average high 84 °F, low 50 °F 84°50° JunJuly: average high 90 °F, low 58 °F 90°58° JulAugust: average high 88 °F, low 56 °F 88°56° AugSeptember: average high 81 °F, low 48 °F 81°48° SepOctober: average high 68 °F, low 37 °F 68°37° OctNovember: average high 55 °F, low 27 °F 55°27° NovDecember: average high 44 °F, low 21 °F 44°21° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 2.01 in precipitation, 10.9 in snowfall 2.0❄11 JanFebruary: 2.54 in precipitation, 11.7 in snowfall 2.5❄12 FebMarch: 1.86 in precipitation, 3.8 in snowfall 1.9❄4 MarApril: 1.03 in precipitation, 2.1 in snowfall 1.0❄2 AprMay: 0.94 in precipitation 0.9 MayJune: 0.43 in precipitation 0.4 JunJuly: 1.00 in precipitation 1.0 JulAugust: 1.79 in precipitation 1.8 AugSeptember: 1.23 in precipitation 1.2 SepOctober: 1.84 in precipitation, 0.3 in snowfall 1.8 OctNovember: 1.28 in precipitation, 3.5 in snowfall 1.3❄4 NovDecember: 1.60 in precipitation, 5.8 in snowfall 1.6❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: New Harmony, UT (within 1 mile); precipitation: New Harmony, UT (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

847426b
Kanarraville, UT · 7 mi
847206b
Cedar City, UT · 9 mi
847796b
Virgin, UT · 12 mi
847816b
Pine Valley, UT · 12 mi
847748b
Toquerville, UT · 15 mi
847226b
Central, UT · 16 mi
847468b
Leeds, UT · 16 mi
847458a
La Verkin, UT · 18 mi

Utah planting zones →

Questions about 84757

What planting zone is ZIP code 84757?

ZIP code 84757 (New Harmony, 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 New Harmony, UT?

The median last spring frost (32 °F) near 84757 is May 9; after May 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, New Harmony station.

When is the first frost in New Harmony, UT?

The median first fall frost near 84757 is October 11, giving a median frost-free growing season of 155 days.

When should I plant tomatoes in 84757?

Start tomato seeds indoors around Mar 14 – Mar 28 and set transplants outside around May 16 – May 30, one to three weeks after the median last frost.

How much rain and snow does 84757 get?

About 17.6 inches of precipitation a year and 38 inches of snowfall (NOAA 1991–2020 normals, New Harmony station).

How hot do summers get in New Harmony, UT?

The average high peaks at 90 °F in July, with about 36 days a year at 90 °F or more.

What kind of soil does 84757 have?

The USDA soil survey maps Nehar at the center of ZIP 84757: very stony sandy loam, well drained, pH about 7.0 (neutral).

Did spring come early in New Harmony, UT in 2026?

Spring leaf-out near 84757 came on Feb 28 in 2026, 12 days earlier than the 1991–2020 average (Mar 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in New Harmony, UT?

Intermediate onions: the longest day near 84757 is 14 h 45 min, so day-neutral types bulb best; long-day varieties may not bulb fully.