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

Planting zone for 84064 — Randolph, UT

ZIP code 84064 (Randolph, Rich County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is June 14 and the first fall frost September 1.

Where ZIP 84064 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.

Zone4a−30 to −25 °F

Coldest night−34.4 to −31.7 °C

Last frostJun 14

First frostSep 1

2012 zone4a

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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Randolph, 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 Randolph, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostJune 14median — 50% chance of a later frost

Safe for tender plantsJune 30only 10% chance of frost after

First fall frostSeptember 1median — 10% chance by Aug 18

Growing season76 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 30 and returns around September 11.

From the NOAA station Randolph, UT — 4 miles away, elevation 6,290 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 84064

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · May 3 – May 17

SpinachSow outdoors · May 3 – May 24

Broccoli, cabbageStart indoors · Apr 5 – Apr 19

Broccoli, cabbageTransplant · May 24 – Jun 7

Onion setsPlant outdoors · May 17 – May 31

PotatoesPlant outdoors · May 24 – Jun 7

LettuceSow outdoors · May 17 – May 31

Carrots, beetsSow outdoors · May 24 – Jun 7

TomatoesStart indoors · Apr 19 – May 3

TomatoesTransplant · Jun 21 – Jul 5

Peppers, eggplantStart indoors · Apr 5 – Apr 19

Peppers, eggplantTransplant · Jun 28 – Jul 12

BeansSow outdoors · Jun 21 – Jul 5

Sweet cornSow outdoors · Jun 21 – Jul 5

Cucumbers, squashSow outdoors · Jun 21 – Jul 5

Fall lettuce, spinachSow outdoors · Jul 7 – Jul 21

GarlicPlant cloves · Aug 18 – Sep 22

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 14) and first fall frost (Sep 1) 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 84064 came on Apr 7 — 22 days earlier than the 1991–2020 average (Apr 29).

average
Apr 292026
Apr 7

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 4a in Utah

376 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. 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 Randolph, UT.

Soil in Randolph, UT

The soil mapped at the center of ZIP 84064 is Nevka — loam, poorly drained.

TextureLoama good balance for most vegetables

pH8.8alkaline; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter1.5%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of local importanceUSDA classification

Map unit: Nevka loam.

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 84064; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Randolph, UT

Summer high82 °Faverage high, July

Winter low4 °Faverage low, January

Hot days4days a year at 90 °F or more

Freezing nights247nights a year at 32 °F or less

Growing degree days1,205base 50 °F — the season’s usable heat

Longest day15 h 12 mindaylight on June 21

Shortest day9 h 09 mindaylight on December 21

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

Precipitation14.4 inper year, rain and melted snow

Snowfall71 inper year; 105 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: Randolph, UT (4 mi away); precipitation: Randolph, UT (4 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.

Garden City, UT · 23 mi

843196a

Hyrum, UT · 29 mi

832875b

Fish Haven, ID · 29 mi

831164b

Diamondville, WY · 30 mi

831144a

Cokeville, WY · 30 mi

829315a

Evanston, WY · 31 mi

Utah planting zones →

Questions about 84064

What planting zone is ZIP code 84064?

ZIP code 84064 (Randolph, UT) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Randolph, UT?

The median last spring frost (32 °F) near 84064 is June 14; after June 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Randolph station.

When is the first frost in Randolph, UT?

The median first fall frost near 84064 is September 1, giving a median frost-free growing season of 76 days.

When should I plant tomatoes in 84064?

Start tomato seeds indoors around Apr 19 – May 3 and set transplants outside around Jun 21 – Jul 5, one to three weeks after the median last frost.

How much rain and snow does 84064 get?

About 14.4 inches of precipitation a year and 71 inches of snowfall (NOAA 1991–2020 normals, Randolph station).

How hot do summers get in Randolph, UT?

The average high peaks at 82 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 84064 have?

The USDA soil survey maps Nevka at the center of ZIP 84064: loam, poorly drained, pH about 8.8 (alkaline).

Did spring come early in Randolph, UT in 2026?

Spring leaf-out near 84064 came on Apr 7 in 2026, 22 days earlier than the 1991–2020 average (Apr 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Randolph, UT?

Long-day onions: the longest day near 84064 is 15 h 12 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).