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

Planting zone for 84124 — Salt Lake City, UT

ZIP code 84124 (Salt Lake City, Salt Lake County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 29 and the first fall frost October 22.

Where ZIP 84124 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.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostApr 29
First frostOct 22
2012 zone7a

Was 7a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Salt Lake City, 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 Salt Lake City, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 29median — 50% chance of a later frost
Safe for tender plantsMay 30only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 6
Growing season174 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 12 and returns around November 1.

From the NOAA station Cottonwood Weir, UT — 4 miles away, elevation 4,987 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 84124

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 18 – Apr 1
SpinachSow outdoors · Mar 18 – Apr 8
Broccoli, cabbageStart indoors · Feb 18 – Mar 4
Broccoli, cabbageTransplant · Apr 8 – Apr 22
Onion setsPlant outdoors · Apr 1 – Apr 15
PotatoesPlant outdoors · Apr 8 – Apr 22
LettuceSow outdoors · Apr 1 – Apr 15
Carrots, beetsSow outdoors · Apr 8 – Apr 22
TomatoesStart indoors · Mar 4 – Mar 18
TomatoesTransplant · May 6 – May 20
Peppers, eggplantStart indoors · Feb 18 – Mar 4
Peppers, eggplantTransplant · May 13 – May 27
BeansSow outdoors · May 6 – May 20
Sweet cornSow outdoors · May 6 – May 20
Cucumbers, squashSow outdoors · May 6 – May 20
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 29) 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 84124 came on Mar 16 — 18 days earlier than the 1991–2020 average (Apr 3).

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 7b in Utah

562 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 7b. Each links to its USDA PLANTS profile.

Trees 30

American beech80 ft · blooms mid spring · low shade tolerance · to −44 °FArizona cypress50 ft · blooms spring · low shade tolerance · to −23 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack walnut100 ft · blooms late spring · high shade tolerance · to −28 °F

Shrubs 112

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °F

Wildflowers & perennials 254

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 155

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAlpine Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °Farctic bluegrass2 ft · high shade tolerance · to −62 °F

Vines 3

trumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

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 Salt Lake City, UT.

Soil in Salt Lake City, UT

The soil mapped at the center of ZIP 84124 is Hillfield — loam, well drained.

TextureLoama good balance for most vegetables
pH8.2alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Hillfield-Taylorsville complex, 6 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 84124; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Salt Lake City, UT

Summer high91 °Faverage high, July
Winter low23 °Faverage low, January
Hot days48days a year at 90 °F or more
Freezing nights112nights a year at 32 °F or less
Growing degree days3,539base 50 °F — the season’s usable heat
Longest day15 h 05 mindaylight on June 21
Shortest day9 h 15 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation20.6 inper year, rain and melted snow
Snowfall56 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 38 °F, low 23 °F 38°23° JanFebruary: average high 44 °F, low 27 °F 44°27° FebMarch: average high 54 °F, low 34 °F 54°34° MarApril: average high 61 °F, low 40 °F 61°40° AprMay: average high 71 °F, low 48 °F 71°48° MayJune: average high 82 °F, low 57 °F 82°57° JunJuly: average high 91 °F, low 68 °F 91°68° JulAugust: average high 89 °F, low 66 °F 89°66° AugSeptember: average high 79 °F, low 56 °F 79°56° SepOctober: average high 64 °F, low 43 °F 64°43° OctNovember: average high 49 °F, low 32 °F 49°32° NovDecember: average high 38 °F, low 23 °F 38°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 2.10 in precipitation, 12.7 in snowfall 2.1❄13 JanFebruary: 1.37 in precipitation, 10 in snowfall 1.4❄10 FebMarch: 2.49 in precipitation, 8.6 in snowfall 2.5❄9 MarApril: 2.81 in precipitation, 4.2 in snowfall 2.8❄4 AprMay: 2.64 in precipitation 2.6 MayJune: 1.17 in precipitation 1.2 JunJuly: 0.76 in precipitation 0.8 JulAugust: 0.76 in precipitation 0.8 AugSeptember: 1.14 in precipitation 1.1 SepOctober: 1.90 in precipitation, 0.8 in snowfall 1.9❄1 OctNovember: 1.70 in precipitation, 6.2 in snowfall 1.7❄6 NovDecember: 1.73 in precipitation, 13.3 in snowfall 1.7❄13 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cottonwood Weir, UT (4 mi away); precipitation: Holladay 0.5 Ese, UT (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

841177b
Salt Lake City, UT · 2 mi
841067b
Salt Lake City, UT · 4 mi
841077b
Salt Lake City, UT · 5 mi
841096b
Salt Lake City, UT · 5 mi
841057b
Salt Lake City, UT · 5 mi
841157b
Salt Lake City, UT · 6 mi
840907b
Sandy, UT · 6 mi
840917b
Sandy, UT · 6 mi

All 47 ZIP codes in Salt Lake City → · Utah planting zones →

Questions about 84124

What planting zone is ZIP code 84124?

ZIP code 84124 (Salt Lake City, UT) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Salt Lake City, UT?

The median last spring frost (32 °F) near 84124 is April 29; after May 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cottonwood Weir station.

When is the first frost in Salt Lake City, UT?

The median first fall frost near 84124 is October 22, giving a median frost-free growing season of 174 days.

When should I plant tomatoes in 84124?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 84124 get?

About 20.6 inches of precipitation a year and 56 inches of snowfall (NOAA 1991–2020 normals, Holladay 0.5 Ese station).

How hot do summers get in Salt Lake City, UT?

The average high peaks at 91 °F in July, with about 48 days a year at 90 °F or more.

What kind of soil does 84124 have?

The USDA soil survey maps Hillfield at the center of ZIP 84124: loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Salt Lake City, UT in 2026?

Spring leaf-out near 84124 came on Mar 16 in 2026, 18 days earlier than the 1991–2020 average (Apr 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Salt Lake City, UT?

Long-day onions: the longest day near 84124 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 84124 change?

Yes. The 2012 USDA map put 84124 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.