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

Planting zone for 84065 — Riverton, UT

ZIP code 84065 (Riverton, Salt Lake County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 18 and the first fall frost October 22.

Where ZIP 84065 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 18

First frostOct 22

2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Riverton, 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 Riverton, UT

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 18median — 50% chance of a later frost

Safe for tender plantsMay 6only 10% chance of frost after

First fall frostOctober 22median — 10% chance by Oct 7

Growing season185 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 2.

From the NOAA station Draper-Point Of Mtn, UT — 2 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 84065

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 7 – Mar 21

SpinachSow outdoors · Mar 7 – Mar 28

Broccoli, cabbageStart indoors · Feb 7 – Feb 21

Broccoli, cabbageTransplant · Mar 28 – Apr 11

Onion setsPlant outdoors · Mar 21 – Apr 4

PotatoesPlant outdoors · Mar 28 – Apr 11

LettuceSow outdoors · Mar 21 – Apr 4

Carrots, beetsSow outdoors · Mar 28 – Apr 11

TomatoesStart indoors · Feb 21 – Mar 7

TomatoesTransplant · Apr 25 – May 9

Peppers, eggplantStart indoors · Feb 7 – Feb 21

Peppers, eggplantTransplant · May 2 – May 16

BeansSow outdoors · Apr 25 – May 9

Sweet cornSow outdoors · Apr 25 – May 9

Cucumbers, squashSow outdoors · Apr 25 – May 9

Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10

GarlicPlant cloves · Oct 8 – Nov 12

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 18) and first fall frost (Oct 22) 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 84065 came on Feb 28 — 23 days earlier than the 1991–2020 average (Mar 23).

average
Mar 232026
Feb 28

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 7a in Utah

561 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Riverton, UT.

Soil in Riverton, UT

The soil mapped at the center of ZIP 84065 is Lakewin — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Lakewin sandy loam, 0 to 1 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 84065; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Riverton, UT

Summer high94 °Faverage high, July

Winter low25 °Faverage low, January

Hot days78days a year at 90 °F or more

Freezing nights116nights a year at 32 °F or less

Growing degree days3,706base 50 °F — the season’s usable heat

Longest day15 h 04 mindaylight on June 21

Shortest day9 h 16 mindaylight on December 21

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

Precipitation18.6 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: Draper-Point Of Mtn, UT (2 mi away); precipitation: Lehi 2.0 Nne, UT (7 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.

840207a

Draper, UT · 4 mi

840957a

South Jordan, UT · 4 mi

840097a

South Jordan, UT · 6 mi

West Jordan, UT · 7 mi

840967a

Herriman, UT · 8 mi

Utah planting zones →

Questions about 84065

What planting zone is ZIP code 84065?

ZIP code 84065 (Riverton, UT) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Riverton, UT?

The median last spring frost (32 °F) near 84065 is April 18; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Draper-Point Of Mtn station.

When is the first frost in Riverton, UT?

The median first fall frost near 84065 is October 22, giving a median frost-free growing season of 185 days.

When should I plant tomatoes in 84065?

Start tomato seeds indoors around Feb 21 – Mar 7 and set transplants outside around Apr 25 – May 9, one to three weeks after the median last frost.

How much rain and snow does 84065 get?

About 18.6 inches of precipitation a year (NOAA 1991–2020 normals, Lehi 2.0 Nne station).

How hot do summers get in Riverton, UT?

The average high peaks at 94 °F in July, with about 78 days a year at 90 °F or more.

What kind of soil does 84065 have?

The USDA soil survey maps Lakewin at the center of ZIP 84065: sandy loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Riverton, UT in 2026?

Spring leaf-out near 84065 came on Feb 28 in 2026, 23 days earlier than the 1991–2020 average (Mar 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Riverton, UT?

Long-day onions: the longest day near 84065 is 15 h 04 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).