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

Planting zone for 84647 — Mount Pleasant, UT

ZIP code 84647 (Mount Pleasant, Sanpete County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 26 and the first fall frost September 25.

Where ZIP 84647 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.

Zone5b−15 to −10 °F

Coldest night−26.1 to −23.3 °C

Last frostMay 26

First frostSep 25

2012 zone6a

Was 6a 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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mount Pleasant, 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 Mount Pleasant, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 26median — 50% chance of a later frost

Safe for tender plantsJune 13only 10% chance of frost after

First fall frostSeptember 25median — 10% chance by Sep 9

Growing season119 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 10 and returns around October 5.

From the NOAA station Moroni, UT — 9 miles away, elevation 5,581 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 84647

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 14 – Apr 28

SpinachSow outdoors · Apr 14 – May 5

Broccoli, cabbageStart indoors · Mar 17 – Mar 31

Broccoli, cabbageTransplant · May 5 – May 19

Onion setsPlant outdoors · Apr 28 – May 12

PotatoesPlant outdoors · May 5 – May 19

LettuceSow outdoors · Apr 28 – May 12

Carrots, beetsSow outdoors · May 5 – May 19

TomatoesStart indoors · Mar 31 – Apr 14

TomatoesTransplant · Jun 2 – Jun 16

Peppers, eggplantStart indoors · Mar 17 – Mar 31

Peppers, eggplantTransplant · Jun 9 – Jun 23

BeansSow outdoors · Jun 2 – Jun 16

Sweet cornSow outdoors · Jun 2 – Jun 16

Cucumbers, squashSow outdoors · Jun 2 – Jun 16

Fall lettuce, spinachSow outdoors · Jul 31 – Aug 14

GarlicPlant cloves · Sep 11 – Oct 16

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 26) and first fall frost (Sep 25) 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 84647 came on Mar 22 — 23 days earlier than the 1991–2020 average (Apr 14).

average
Apr 142026
Mar 22

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 5b in Utah

517 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. 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 Mount Pleasant, UT.

Soil in Mount Pleasant, UT

The soil mapped at the center of ZIP 84647 is Mower — stony clay loam, well drained.

TextureStony clay loamholds water and nutrients; slow to drain and warm up

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter5.5%high

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Mower stony clay loam, 5 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 84647; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mount Pleasant, UT

Summer high89 °Faverage high, July

Winter low13 °Faverage low, January

Hot days32days a year at 90 °F or more

Freezing nights189nights a year at 32 °F or less

Growing degree days2,223base 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

Precipitation28.8 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Moroni, UT (9 mi away); precipitation: Huntington Horse, UT (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

846626a

Spring City, UT · 7 mi

Fountain Green, UT · 15 mi

Huntington, UT · 20 mi

Utah planting zones →

Questions about 84647

What planting zone is ZIP code 84647?

ZIP code 84647 (Mount Pleasant, UT) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Mount Pleasant, UT?

The median last spring frost (32 °F) near 84647 is May 26; after June 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Moroni station.

When is the first frost in Mount Pleasant, UT?

The median first fall frost near 84647 is September 25, giving a median frost-free growing season of 119 days.

When should I plant tomatoes in 84647?

Start tomato seeds indoors around Mar 31 – Apr 14 and set transplants outside around Jun 2 – Jun 16, one to three weeks after the median last frost.

How much rain and snow does 84647 get?

About 28.8 inches of precipitation a year (NOAA 1991–2020 normals, Huntington Horse station).

How hot do summers get in Mount Pleasant, UT?

The average high peaks at 89 °F in July, with about 32 days a year at 90 °F or more.

What kind of soil does 84647 have?

The USDA soil survey maps Mower at the center of ZIP 84647: stony clay loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Mount Pleasant, UT in 2026?

Spring leaf-out near 84647 came on Mar 22 in 2026, 23 days earlier than the 1991–2020 average (Apr 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mount Pleasant, UT?

Intermediate onions: the longest day near 84647 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 84647 change?

Yes. The 2012 USDA map put 84647 in zone 6a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.