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

Planting zone for 84732 — Greenwich, UT

ZIP code 84732 (Greenwich, Piute County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is June 6 and the first fall frost September 21.

Where ZIP 84732 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 frostJun 6

First frostSep 21

2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Greenwich, 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 Greenwich, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsJune 26only 10% chance of frost after

First fall frostSeptember 21median — 10% chance by Sep 5

Growing season104 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 26 and returns around September 29.

From the NOAA station Koosharem, UT — 4 miles away, elevation 6,929 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 84732

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 25 – May 9

SpinachSow outdoors · Apr 25 – May 16

Broccoli, cabbageStart indoors · Mar 28 – Apr 11

Broccoli, cabbageTransplant · May 16 – May 30

Onion setsPlant outdoors · May 9 – May 23

PotatoesPlant outdoors · May 16 – May 30

LettuceSow outdoors · May 9 – May 23

Carrots, beetsSow outdoors · May 16 – May 30

TomatoesStart indoors · Apr 11 – Apr 25

TomatoesTransplant · Jun 13 – Jun 27

Peppers, eggplantStart indoors · Mar 28 – Apr 11

Peppers, eggplantTransplant · Jun 20 – Jul 4

BeansSow outdoors · Jun 13 – Jun 27

Sweet cornSow outdoors · Jun 13 – Jun 27

Cucumbers, squashSow outdoors · Jun 13 – Jun 27

Fall lettuce, spinachSow outdoors · Jul 27 – Aug 10

GarlicPlant cloves · Sep 7 – Oct 12

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 6) and first fall frost (Sep 21) 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 84732 came on Mar 22 — 21 days earlier than the 1991–2020 average (Apr 12).

average
Apr 122026
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 Greenwich, UT.

Soil in Greenwich, UT

The soil mapped at the center of ZIP 84732 is Eldgin — gravelly sandy clay loam, well drained.

TextureGravelly sandy clay loamholds water and nutrients; slow to drain and warm up

pH7.6slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Eldgin, very stony-Dacore complex, 0 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 84732; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Greenwich, UT

Summer high85 °Faverage high, July

Winter low11 °Faverage low, December

Hot days8days a year at 90 °F or more

Freezing nights221nights a year at 32 °F or less

Growing degree days1,620base 50 °F — the season’s usable heat

Longest day14 h 51 mindaylight on June 21

Shortest day9 h 29 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation10.1 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: Koosharem, UT (4 mi away); precipitation: Koosharem, UT (4 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.

847016a

Richfield, UT · 12 mi

847446a

Koosharem, UT · 13 mi

847476a

Loa, UT · 14 mi

847506a

Marysvale, UT · 16 mi

Annabella, UT · 21 mi

Utah planting zones →

Questions about 84732

What planting zone is ZIP code 84732?

ZIP code 84732 (Greenwich, 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 Greenwich, UT?

The median last spring frost (32 °F) near 84732 is June 6; after June 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Koosharem station.

When is the first frost in Greenwich, UT?

The median first fall frost near 84732 is September 21, giving a median frost-free growing season of 104 days.

When should I plant tomatoes in 84732?

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

How much rain and snow does 84732 get?

About 10.1 inches of precipitation a year (NOAA 1991–2020 normals, Koosharem station).

How hot do summers get in Greenwich, UT?

The average high peaks at 85 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 84732 have?

The USDA soil survey maps Eldgin at the center of ZIP 84732: gravelly sandy clay loam, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Greenwich, UT in 2026?

Spring leaf-out near 84732 came on Mar 22 in 2026, 21 days earlier than the 1991–2020 average (Apr 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Greenwich, UT?

Intermediate onions: the longest day near 84732 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.