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

Planting zone for 84005 — Eagle Mountain, UT

ZIP code 84005 (Eagle Mountain, Utah County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 30 and the first fall frost October 9.

Where ZIP 84005 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 30

First frostOct 9

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 Eagle Mountain, 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 Eagle Mountain, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 30median — 50% chance of a later frost

Safe for tender plantsMay 27only 10% chance of frost after

First fall frostOctober 9median — 10% chance by Sep 26

Growing season159 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around October 22.

From the NOAA station Utah Lake Lehi, UT — 6 miles away, elevation 4,505 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 84005

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 19 – Apr 2

SpinachSow outdoors · Mar 19 – Apr 9

Broccoli, cabbageStart indoors · Feb 19 – Mar 5

Broccoli, cabbageTransplant · Apr 9 – Apr 23

Onion setsPlant outdoors · Apr 2 – Apr 16

PotatoesPlant outdoors · Apr 9 – Apr 23

LettuceSow outdoors · Apr 2 – Apr 16

Carrots, beetsSow outdoors · Apr 9 – Apr 23

TomatoesStart indoors · Mar 5 – Mar 19

TomatoesTransplant · May 7 – May 21

Peppers, eggplantStart indoors · Feb 19 – Mar 5

Peppers, eggplantTransplant · May 14 – May 28

BeansSow outdoors · May 7 – May 21

Sweet cornSow outdoors · May 7 – May 21

Cucumbers, squashSow outdoors · May 7 – May 21

Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28

GarlicPlant cloves · Sep 25 – Oct 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 9) 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 84005 came on Mar 17 — 13 days earlier than the 1991–2020 average (Mar 30).

average
Mar 302026
Mar 17

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 Eagle Mountain, UT.

Soil in Eagle Mountain, UT

The soil mapped at the center of ZIP 84005 is Linoyer — very fine sandy loam, well drained.

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

pH8.4alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Linoyer very fine sandy loam, 2 to 5 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 84005; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Eagle Mountain, UT

Summer high92 °Faverage high, July

Winter low19 °Faverage low, January

Hot days50days a year at 90 °F or more

Freezing nights149nights a year at 32 °F or less

Growing degree days2,887base 50 °F — the season’s usable heat

Longest day15 h 03 mindaylight on June 21

Shortest day9 h 17 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation13.1 inper year, rain and melted snow

Snowfall26 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Utah Lake Lehi, UT (6 mi away); precipitation: Utah Lake Lehi, UT (6 mi away). 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.

840457a

Saratoga Springs, UT · 4 mi

840136a

Cedar Valley, UT · 5 mi

Utah planting zones →

Questions about 84005

What planting zone is ZIP code 84005?

ZIP code 84005 (Eagle Mountain, 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 Eagle Mountain, UT?

The median last spring frost (32 °F) near 84005 is April 30; after May 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Utah Lake Lehi station.

When is the first frost in Eagle Mountain, UT?

The median first fall frost near 84005 is October 9, giving a median frost-free growing season of 159 days.

When should I plant tomatoes in 84005?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 84005 get?

About 13.1 inches of precipitation a year and 26 inches of snowfall (NOAA 1991–2020 normals, Utah Lake Lehi station).

How hot do summers get in Eagle Mountain, UT?

The average high peaks at 92 °F in July, with about 50 days a year at 90 °F or more.

What kind of soil does 84005 have?

The USDA soil survey maps Linoyer at the center of ZIP 84005: very fine sandy loam, well drained, pH about 8.4 (alkaline).

Did spring come early in Eagle Mountain, UT in 2026?

Spring leaf-out near 84005 came on Mar 17 in 2026, 13 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Eagle Mountain, UT?

Long-day onions: the longest day near 84005 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 84005 change?

Yes. The 2012 USDA map put 84005 in zone 7a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.