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

Planting zone for 84102 — Salt Lake City, UT

ZIP code 84102 (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 March 31 and the first fall frost November 8.

Where ZIP 84102 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 frostMar 31
First frostNov 8
2012 zone7b

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 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 frostMarch 31median — 50% chance of a later frost
Safe for tender plantsApril 19only 10% chance of frost after
First fall frostNovember 8median — 10% chance by Oct 23
Growing season224 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 8 and returns around November 18.

From the NOAA station Salt Lake Triad Center, UT — 2 miles away, elevation 4,282 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 84102

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 17 – Mar 3
SpinachSow outdoors · Feb 17 – Mar 10
Broccoli, cabbageStart indoors · Jan 20 – Feb 3
Broccoli, cabbageTransplant · Mar 10 – Mar 24
Onion setsPlant outdoors · Mar 3 – Mar 17
PotatoesPlant outdoors · Mar 10 – Mar 24
LettuceSow outdoors · Mar 3 – Mar 17
Carrots, beetsSow outdoors · Mar 10 – Mar 24
TomatoesStart indoors · Feb 3 – Feb 17
TomatoesTransplant · Apr 7 – Apr 21
Peppers, eggplantStart indoors · Jan 20 – Feb 3
Peppers, eggplantTransplant · Apr 14 – Apr 28
BeansSow outdoors · Apr 7 – Apr 21
Sweet cornSow outdoors · Apr 7 – Apr 21
Cucumbers, squashSow outdoors · Apr 7 – Apr 21
Fall lettuce, spinachSow outdoors · Sep 13 – Sep 27
GarlicPlant cloves · Oct 25 – Nov 29
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 31) and first fall frost (Nov 8) 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 84102 came on Feb 28 — 20 days earlier than the 1991–2020 average (Mar 20).

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 center of ZIP 84102 is mapped as Urban land: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 84102; 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 low28 °Faverage low, January
Hot days45days a year at 90 °F or more
Freezing nights81nights a year at 32 °F or less
Growing degree days3,943base 50 °F — the season’s usable heat
Longest day15 h 06 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)
Precipitation21.8 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 28 °F 40°28° JanFebruary: average high 46 °F, low 31 °F 46°31° FebMarch: average high 56 °F, low 39 °F 56°39° MarApril: average high 62 °F, low 44 °F 62°44° AprMay: average high 72 °F, low 52 °F 72°52° MayJune: average high 83 °F, low 61 °F 83°61° JunJuly: average high 91 °F, low 70 °F 91°70° JulAugust: average high 90 °F, low 68 °F 90°68° AugSeptember: average high 80 °F, low 58 °F 80°58° SepOctober: average high 66 °F, low 47 °F 66°47° OctNovember: average high 52 °F, low 37 °F 52°37° NovDecember: average high 41 °F, low 28 °F 41°28° Dec

Precipitation by month inches

0″1″2″3″January: 2.12 in precipitation 2.1 JanFebruary: 1.68 in precipitation 1.7 FebMarch: 2.71 in precipitation 2.7 MarApril: 2.84 in precipitation 2.8 AprMay: 2.76 in precipitation 2.8 MayJune: 1.30 in precipitation 1.3 JunJuly: 0.81 in precipitation 0.8 JulAugust: 0.82 in precipitation 0.8 AugSeptember: 1.39 in precipitation 1.4 SepOctober: 1.77 in precipitation 1.8 OctNovember: 1.76 in precipitation 1.8 NovDecember: 1.80 in precipitation 1.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Salt Lake Triad Center, UT (2 mi away); precipitation: Salt Lake City 1.8 Se, 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.

841117b
Salt Lake City, UT · 1 mi
841127a
Salt Lake City, UT · 1 mi
841487b
Salt Lake City, UT · 1 mi
841397b
Salt Lake City, UT · 1 mi
841477b
Salt Lake City, UT · 1 mi
841527b
Salt Lake City, UT · 1 mi
841337b
Salt Lake City, UT · 1 mi
841057b
Salt Lake City, UT · 2 mi

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

Questions about 84102

What planting zone is ZIP code 84102?

ZIP code 84102 (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 84102 is March 31; after April 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Salt Lake Triad Center station.

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

The median first fall frost near 84102 is November 8, giving a median frost-free growing season of 224 days.

When should I plant tomatoes in 84102?

Start tomato seeds indoors around Feb 3 – Feb 17 and set transplants outside around Apr 7 – Apr 21, one to three weeks after the median last frost.

How much rain and snow does 84102 get?

About 21.8 inches of precipitation a year (NOAA 1991–2020 normals, Salt Lake City 1.8 Se station).

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

The average high peaks at 91 °F in July, with about 45 days a year at 90 °F or more.

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

Spring leaf-out near 84102 came on Feb 28 in 2026, 20 days earlier than the 1991–2020 average (Mar 20), 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 84102 is 15 h 06 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).