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

Planting zone for 84513 — Castle Dale, UT

ZIP code 84513 (Castle Dale, Emery County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 18 and the first fall frost September 27.

Where ZIP 84513 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 18
First frostSep 27
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 Castle Dale, 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 Castle Dale, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 18median — 50% chance of a later frost
Safe for tender plantsJune 8only 10% chance of frost after
First fall frostSeptember 27median — 10% chance by Sep 14
Growing season128 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 4 and returns around October 5.

From the NOAA station Castle Dale, UT — 4 miles away, elevation 5,630 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 84513

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 6 – Apr 20
SpinachSow outdoors · Apr 6 – Apr 27
Broccoli, cabbageStart indoors · Mar 9 – Mar 23
Broccoli, cabbageTransplant · Apr 27 – May 11
Onion setsPlant outdoors · Apr 20 – May 4
PotatoesPlant outdoors · Apr 27 – May 11
LettuceSow outdoors · Apr 20 – May 4
Carrots, beetsSow outdoors · Apr 27 – May 11
TomatoesStart indoors · Mar 23 – Apr 6
TomatoesTransplant · May 25 – Jun 8
Peppers, eggplantStart indoors · Mar 9 – Mar 23
Peppers, eggplantTransplant · Jun 1 – Jun 15
BeansSow outdoors · May 25 – Jun 8
Sweet cornSow outdoors · May 25 – Jun 8
Cucumbers, squashSow outdoors · May 25 – Jun 8
Fall lettuce, spinachSow outdoors · Aug 2 – Aug 16
GarlicPlant cloves · Sep 13 – Oct 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 18) and first fall frost (Sep 27) 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 84513 came on Mar 16 — 15 days earlier than the 1991–2020 average (Mar 31).

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 Castle Dale, UT.

Soil in Castle Dale, UT

The soil mapped at the center of ZIP 84513 is Billings — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.9%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Billings-Gullied land complex, 1 to 6 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 84513; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Castle Dale, UT

Summer high91 °Faverage high, July
Winter low10 °Faverage low, January
Hot days44days a year at 90 °F or more
Freezing nights186nights a year at 32 °F or less
Growing degree days2,574base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation8 inper year, rain and melted snow
Snowfall17 inper year; 33 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 10 °F 40°10° JanFebruary: average high 47 °F, low 16 °F 47°16° FebMarch: average high 58 °F, low 25 °F 58°25° MarApril: average high 66 °F, low 31 °F 66°31° AprMay: average high 75 °F, low 40 °F 75°40° MayJune: average high 85 °F, low 47 °F 85°47° JunJuly: average high 91 °F, low 54 °F 91°54° JulAugust: average high 89 °F, low 52 °F 89°52° AugSeptember: average high 81 °F, low 43 °F 81°43° SepOctober: average high 68 °F, low 32 °F 68°32° OctNovember: average high 53 °F, low 20 °F 53°20° NovDecember: average high 41 °F, low 11 °F 41°11° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.63 in precipitation, 5.5 in snowfall 0.6❄6 JanFebruary: 0.64 in precipitation, 3.3 in snowfall 0.6❄3 FebMarch: 0.59 in precipitation, 1.4 in snowfall 0.6❄1 MarApril: 0.54 in precipitation, 0.2 in snowfall 0.5 AprMay: 0.72 in precipitation 0.7 MayJune: 0.45 in precipitation 0.5 JunJuly: 0.59 in precipitation 0.6 JulAugust: 0.92 in precipitation 0.9 AugSeptember: 1.03 in precipitation 1.0 SepOctober: 0.97 in precipitation, 0.1 in snowfall 1.0 OctNovember: 0.46 in precipitation, 1.2 in snowfall 0.5❄1 NovDecember: 0.47 in precipitation, 4.9 in snowfall 0.5❄5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Castle Dale, UT (4 mi away); precipitation: Castle Dale, UT (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

845376a
Orangeville, UT · 9 mi
845166a
Clawson, UT · 10 mi
845286a
Huntington, UT · 11 mi
845186a
Cleveland, UT · 11 mi
845216a
Elmo, UT · 17 mi
845236b
Ferron, UT · 18 mi
845016a
Price, UT · 22 mi
846475b
Mount Pleasant, UT · 28 mi

Utah planting zones →

Questions about 84513

What planting zone is ZIP code 84513?

ZIP code 84513 (Castle Dale, 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 Castle Dale, UT?

The median last spring frost (32 °F) near 84513 is May 18; after June 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Castle Dale station.

When is the first frost in Castle Dale, UT?

The median first fall frost near 84513 is September 27, giving a median frost-free growing season of 128 days.

When should I plant tomatoes in 84513?

Start tomato seeds indoors around Mar 23 – Apr 6 and set transplants outside around May 25 – Jun 8, one to three weeks after the median last frost.

How much rain and snow does 84513 get?

About 8 inches of precipitation a year and 17 inches of snowfall (NOAA 1991–2020 normals, Castle Dale station).

How hot do summers get in Castle Dale, UT?

The average high peaks at 91 °F in July, with about 44 days a year at 90 °F or more.

What kind of soil does 84513 have?

The USDA soil survey maps Billings at the center of ZIP 84513: silty clay loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Castle Dale, UT in 2026?

Spring leaf-out near 84513 came on Mar 16 in 2026, 15 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Castle Dale, UT?

Intermediate onions: the longest day near 84513 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.