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

Planting zone for 84655 — Santaquin, UT

ZIP code 84655 (Santaquin, Utah County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 4 and the first fall frost October 11.

Where ZIP 84655 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostMay 4
First frostOct 11
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Santaquin, 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 Santaquin, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 4median — 50% chance of a later frost
Safe for tender plantsMay 28only 10% chance of frost after
First fall frostOctober 11median — 10% chance by Sep 27
Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 19 and returns around October 23.

From the NOAA station Santaquin Chlorinator, UT — 2 miles away, elevation 5,161 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 84655

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 23 – Apr 6
SpinachSow outdoors · Mar 23 – Apr 13
Broccoli, cabbageStart indoors · Feb 23 – Mar 9
Broccoli, cabbageTransplant · Apr 13 – Apr 27
Onion setsPlant outdoors · Apr 6 – Apr 20
PotatoesPlant outdoors · Apr 13 – Apr 27
LettuceSow outdoors · Apr 6 – Apr 20
Carrots, beetsSow outdoors · Apr 13 – Apr 27
TomatoesStart indoors · Mar 9 – Mar 23
TomatoesTransplant · May 11 – May 25
Peppers, eggplantStart indoors · Feb 23 – Mar 9
Peppers, eggplantTransplant · May 18 – Jun 1
BeansSow outdoors · May 11 – May 25
Sweet cornSow outdoors · May 11 – May 25
Cucumbers, squashSow outdoors · May 11 – May 25
Fall lettuce, spinachSow outdoors · Aug 16 – Aug 30
GarlicPlant cloves · Sep 27 – Nov 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 11) 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 84655 came on Mar 9 — 18 days earlier than the 1991–2020 average (Mar 27).

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 6b in Utah

549 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 6b. 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 107

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 251

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 151

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 Santaquin, UT.

Soil in Santaquin, UT

The soil mapped at the center of ZIP 84655 is Donnardo — stony loam, well drained.

TextureStony loama good balance for most vegetables
pH7.6slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Donnardo stony loam, 8 to 25 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 84655; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Santaquin, UT

Summer high90 °Faverage high, July
Winter low20 °Faverage low, January
Hot days50days a year at 90 °F or more
Freezing nights144nights a year at 32 °F or less
Growing degree days3,017base 50 °F — the season’s usable heat
Longest day15 h 01 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation18.4 inper year, rain and melted snow
Snowfall55 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 20 °F 37°20° JanFebruary: average high 42 °F, low 24 °F 42°24° FebMarch: average high 52 °F, low 31 °F 52°31° MarApril: average high 59 °F, low 36 °F 59°36° AprMay: average high 69 °F, low 44 °F 69°44° MayJune: average high 81 °F, low 53 °F 81°53° JunJuly: average high 90 °F, low 63 °F 90°63° JulAugust: average high 88 °F, low 61 °F 88°61° AugSeptember: average high 78 °F, low 51 °F 78°51° SepOctober: average high 64 °F, low 38 °F 64°38° OctNovember: average high 49 °F, low 28 °F 49°28° NovDecember: average high 38 °F, low 20 °F 38°20° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 1.83 in precipitation, 13.4 in snowfall 1.8❄13 JanFebruary: 1.63 in precipitation, 13.3 in snowfall 1.6❄13 FebMarch: 1.94 in precipitation, 6.9 in snowfall 1.9❄7 MarApril: 2.20 in precipitation, 3.3 in snowfall 2.2❄3 AprMay: 1.91 in precipitation 1.9 MayJune: 0.91 in precipitation 0.9 JunJuly: 0.73 in precipitation 0.7 JulAugust: 0.76 in precipitation 0.8 AugSeptember: 1.19 in precipitation, 0.1 in snowfall 1.2 SepOctober: 1.80 in precipitation, 0.8 in snowfall 1.8❄1 OctNovember: 1.53 in precipitation, 5.6 in snowfall 1.5❄6 NovDecember: 1.92 in precipitation, 11.7 in snowfall 1.9❄12 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Santaquin Chlorinator, UT (2 mi away); precipitation: Santaquin Chlorinator, UT (2 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.

846336b
Goshen, UT · 5 mi
846516b
Payson, UT · 6 mi
846456b
Mona, UT · 8 mi
846537a
Salem, UT · 9 mi
846266b
Elberta, UT · 10 mi
846647a
Mapleton, UT · 16 mi
846286b
Eureka, UT · 18 mi
846017a
Provo, UT · 19 mi

Utah planting zones →

Questions about 84655

What planting zone is ZIP code 84655?

ZIP code 84655 (Santaquin, UT) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Santaquin, UT?

The median last spring frost (32 °F) near 84655 is May 4; after May 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Santaquin Chlorinator station.

When is the first frost in Santaquin, UT?

The median first fall frost near 84655 is October 11, giving a median frost-free growing season of 157 days.

When should I plant tomatoes in 84655?

Start tomato seeds indoors around Mar 9 – Mar 23 and set transplants outside around May 11 – May 25, one to three weeks after the median last frost.

How much rain and snow does 84655 get?

About 18.4 inches of precipitation a year and 55 inches of snowfall (NOAA 1991–2020 normals, Santaquin Chlorinator station).

How hot do summers get in Santaquin, UT?

The average high peaks at 90 °F in July, with about 50 days a year at 90 °F or more.

What kind of soil does 84655 have?

The USDA soil survey maps Donnardo at the center of ZIP 84655: stony loam, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Santaquin, UT in 2026?

Spring leaf-out near 84655 came on Mar 9 in 2026, 18 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Santaquin, UT?

Long-day onions: the longest day near 84655 is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).