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

Planting zone for 84648 — Nephi, UT

ZIP code 84648 (Nephi, Juab County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 6 and the first fall frost October 10.

Where ZIP 84648 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 6

First frostOct 10

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 Nephi, 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 Nephi, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 6median — 50% chance of a later frost

Safe for tender plantsMay 24only 10% chance of frost after

First fall frostOctober 10median — 10% chance by Sep 28

Growing season156 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 21 and returns around October 23.

From the NOAA station Nephi, UT — 2 miles away, elevation 5,148 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 84648

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 25 – Apr 8

SpinachSow outdoors · Mar 25 – Apr 15

Broccoli, cabbageStart indoors · Feb 25 – Mar 11

Broccoli, cabbageTransplant · Apr 15 – Apr 29

Onion setsPlant outdoors · Apr 8 – Apr 22

PotatoesPlant outdoors · Apr 15 – Apr 29

LettuceSow outdoors · Apr 8 – Apr 22

Carrots, beetsSow outdoors · Apr 15 – Apr 29

TomatoesStart indoors · Mar 11 – Mar 25

TomatoesTransplant · May 13 – May 27

Peppers, eggplantStart indoors · Feb 25 – Mar 11

Peppers, eggplantTransplant · May 20 – Jun 3

BeansSow outdoors · May 13 – May 27

Sweet cornSow outdoors · May 13 – May 27

Cucumbers, squashSow outdoors · May 13 – May 27

Fall lettuce, spinachSow outdoors · Aug 15 – Aug 29

GarlicPlant cloves · Sep 26 – Oct 31

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 6) and first fall frost (Oct 10) 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 84648 came on Mar 14 — 14 days earlier than the 1991–2020 average (Mar 28).

average
Mar 282026
Mar 14

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.

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 Nephi, UT.

Soil in Nephi, UT

The soil mapped at the center of ZIP 84648 is Juab — loam, well drained.

TextureLoama good balance for most vegetables

pH8.5alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Juab loam, 0 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 84648; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Nephi, UT

Summer high90 °Faverage high, July

Winter low20 °Faverage low, January

Hot days48days a year at 90 °F or more

Freezing nights148nights a year at 32 °F or less

Growing degree days2,928base 50 °F — the season’s usable heat

Longest day14 h 59 mindaylight on June 21

Shortest day9 h 21 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

Snowfall45 inper year; 66 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: Nephi, UT (2 mi away); precipitation: Nephi, UT (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

846456b

Mona, UT · 12 mi

846325b

Fountain Green, UT · 12 mi

Santaquin, UT · 20 mi

Utah planting zones →

Questions about 84648

What planting zone is ZIP code 84648?

ZIP code 84648 (Nephi, 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 Nephi, UT?

The median last spring frost (32 °F) near 84648 is May 6; after May 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Nephi station.

When is the first frost in Nephi, UT?

The median first fall frost near 84648 is October 10, giving a median frost-free growing season of 156 days.

When should I plant tomatoes in 84648?

Start tomato seeds indoors around Mar 11 – Mar 25 and set transplants outside around May 13 – May 27, one to three weeks after the median last frost.

How much rain and snow does 84648 get?

About 13.7 inches of precipitation a year and 45 inches of snowfall (NOAA 1991–2020 normals, Nephi station).

How hot do summers get in Nephi, UT?

The average high peaks at 90 °F in July, with about 48 days a year at 90 °F or more.

What kind of soil does 84648 have?

The USDA soil survey maps Juab at the center of ZIP 84648: loam, well drained, pH about 8.5 (alkaline).

Did spring come early in Nephi, UT in 2026?

Spring leaf-out near 84648 came on Mar 14 in 2026, 14 days earlier than the 1991–2020 average (Mar 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Nephi, UT?

Intermediate onions: the longest day near 84648 is 14 h 59 min, so day-neutral types bulb best; long-day varieties may not bulb fully.