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

Planting zone for 84639 — Levan, UT

ZIP code 84639 (Levan, Juab County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 10 and the first fall frost October 7.

Where ZIP 84639 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostMay 10
First frostOct 7
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Levan, 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 Levan, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 10median — 50% chance of a later frost
Safe for tender plantsMay 31only 10% chance of frost after
First fall frostOctober 7median — 10% chance by Sep 24
Growing season148 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 27 and returns around October 18.

From the NOAA station Levan, UT — 4 miles away, elevation 5,299 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 84639

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 29 – Apr 12
SpinachSow outdoors · Mar 29 – Apr 19
Broccoli, cabbageStart indoors · Mar 1 – Mar 15
Broccoli, cabbageTransplant · Apr 19 – May 3
Onion setsPlant outdoors · Apr 12 – Apr 26
PotatoesPlant outdoors · Apr 19 – May 3
LettuceSow outdoors · Apr 12 – Apr 26
Carrots, beetsSow outdoors · Apr 19 – May 3
TomatoesStart indoors · Mar 15 – Mar 29
TomatoesTransplant · May 17 – May 31
Peppers, eggplantStart indoors · Mar 1 – Mar 15
Peppers, eggplantTransplant · May 24 – Jun 7
BeansSow outdoors · May 17 – May 31
Sweet cornSow outdoors · May 17 – May 31
Cucumbers, squashSow outdoors · May 17 – May 31
Fall lettuce, spinachSow outdoors · Aug 12 – Aug 26
GarlicPlant cloves · Sep 23 – Oct 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 10) and first fall frost (Oct 7) 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 84639 came on Mar 12 — 15 days earlier than the 1991–2020 average (Mar 27).

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 6a in Utah

546 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 6a. 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 107

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 248

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 151

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 Levan, UT.

Soil in Levan, UT

The soil mapped at the center of ZIP 84639 is Woodrow — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH8.5alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Woodrow silt loam, 1 to 2 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 84639; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Levan, UT

Summer high91 °Faverage high, July
Winter low18 °Faverage low, January
Hot days47days a year at 90 °F or more
Freezing nights163nights a year at 32 °F or less
Growing degree days2,891base 50 °F — the season’s usable heat
Longest day14 h 58 mindaylight on June 21
Shortest day9 h 22 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation14.1 inper year, rain and melted snow
Snowfall32 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 39 °F, low 18 °F 39°18° JanFebruary: average high 44 °F, low 22 °F 44°22° FebMarch: average high 55 °F, low 29 °F 55°29° MarApril: average high 63 °F, low 34 °F 63°34° AprMay: average high 72 °F, low 42 °F 72°42° MayJune: average high 84 °F, low 51 °F 84°51° JunJuly: average high 91 °F, low 59 °F 91°59° JulAugust: average high 89 °F, low 57 °F 89°57° AugSeptember: average high 80 °F, low 48 °F 80°48° SepOctober: average high 67 °F, low 37 °F 67°37° OctNovember: average high 51 °F, low 26 °F 51°26° NovDecember: average high 39 °F, low 18 °F 39°18° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 1.26 in precipitation, 7.7 in snowfall 1.3❄8 JanFebruary: 1.29 in precipitation, 5.5 in snowfall 1.3❄6 FebMarch: 1.54 in precipitation, 2.3 in snowfall 1.5❄2 MarApril: 1.61 in precipitation, 2.2 in snowfall 1.6❄2 AprMay: 1.53 in precipitation, 0.1 in snowfall 1.5 MayJune: 0.70 in precipitation 0.7 JunJuly: 0.68 in precipitation 0.7 JulAugust: 0.57 in precipitation 0.6 AugSeptember: 0.99 in precipitation 1.0 SepOctober: 1.41 in precipitation, 0.7 in snowfall 1.4❄1 OctNovember: 1.14 in precipitation, 4.5 in snowfall 1.1❄5 NovDecember: 1.41 in precipitation, 9.2 in snowfall 1.4❄9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Levan, UT (4 mi away); precipitation: Levan, 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.

846486a
Nephi, UT · 13 mi
846675b
Wales, UT · 13 mi
846306b
Fayette, UT · 14 mi
846465b
Moroni, UT · 16 mi
846325b
Fountain Green, UT · 17 mi
846235b
Chester, UT · 17 mi
846276a
Ephraim, UT · 20 mi
846456b
Mona, UT · 25 mi

Utah planting zones →

Questions about 84639

What planting zone is ZIP code 84639?

ZIP code 84639 (Levan, UT) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Levan, UT?

The median last spring frost (32 °F) near 84639 is May 10; after May 31 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Levan station.

When is the first frost in Levan, UT?

The median first fall frost near 84639 is October 7, giving a median frost-free growing season of 148 days.

When should I plant tomatoes in 84639?

Start tomato seeds indoors around Mar 15 – Mar 29 and set transplants outside around May 17 – May 31, one to three weeks after the median last frost.

How much rain and snow does 84639 get?

About 14.1 inches of precipitation a year and 32 inches of snowfall (NOAA 1991–2020 normals, Levan station).

How hot do summers get in Levan, UT?

The average high peaks at 91 °F in July, with about 47 days a year at 90 °F or more.

What kind of soil does 84639 have?

The USDA soil survey maps Woodrow at the center of ZIP 84639: silt loam, well drained, pH about 8.5 (alkaline).

Did spring come early in Levan, UT in 2026?

Spring leaf-out near 84639 came on Mar 12 in 2026, 15 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Levan, UT?

Intermediate onions: the longest day near 84639 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.