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

Planting zone for 84531 — Mexican Hat, UT

ZIP code 84531 (Mexican Hat, San Juan County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 11 and the first fall frost October 30.

Where ZIP 84531 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 11
First frostOct 30
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 Mexican Hat, 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 Mexican Hat, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 11median — 50% chance of a later frost
Safe for tender plantsApril 26only 10% chance of frost after
First fall frostOctober 30median — 10% chance by Oct 17
Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 8.

From the NOAA station Mexican Hat, UT — 6 miles away, elevation 4,108 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 84531

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 28 – Mar 14
SpinachSow outdoors · Feb 28 – Mar 21
Broccoli, cabbageStart indoors · Jan 31 – Feb 14
Broccoli, cabbageTransplant · Mar 21 – Apr 4
Onion setsPlant outdoors · Mar 14 – Mar 28
PotatoesPlant outdoors · Mar 21 – Apr 4
LettuceSow outdoors · Mar 14 – Mar 28
Carrots, beetsSow outdoors · Mar 21 – Apr 4
TomatoesStart indoors · Feb 14 – Feb 28
TomatoesTransplant · Apr 18 – May 2
Peppers, eggplantStart indoors · Jan 31 – Feb 14
Peppers, eggplantTransplant · Apr 25 – May 9
BeansSow outdoors · Apr 18 – May 2
Sweet cornSow outdoors · Apr 18 – May 2
Cucumbers, squashSow outdoors · Apr 18 – May 2
Fall lettuce, spinachSow outdoors · Sep 4 – Sep 18
GarlicPlant cloves · Oct 16 – Nov 20
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 30) 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 84531 came on Mar 1 — 11 days earlier than the 1991–2020 average (Mar 12).

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 Mexican Hat, UT.

Soil in Mexican Hat, UT

The soil mapped at the center of ZIP 84531 is Moenkopie — 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 matter0.75%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Moenkopie sandy loam, 3 to 8 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 84531; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mexican Hat, UT

Summer high99 °Faverage high, July
Winter low22 °Faverage low, December
Hot days103days a year at 90 °F or more
Freezing nights124nights a year at 32 °F or less
Growing degree days4,596base 50 °F — the season’s usable heat
Longest day14 h 43 mindaylight on June 21
Shortest day9 h 37 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation6.3 inper year, rain and melted snow
Snowfall2 inper year; 1 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 47 °F, low 23 °F 47°23° JanFebruary: average high 53 °F, low 27 °F 53°27° FebMarch: average high 64 °F, low 33 °F 64°33° MarApril: average high 72 °F, low 40 °F 72°40° AprMay: average high 82 °F, low 51 °F 82°51° MayJune: average high 95 °F, low 60 °F 95°60° JunJuly: average high 99 °F, low 69 °F 99°69° JulAugust: average high 96 °F, low 67 °F 96°67° AugSeptember: average high 88 °F, low 56 °F 88°56° SepOctober: average high 74 °F, low 43 °F 74°43° OctNovember: average high 58 °F, low 30 °F 58°30° NovDecember: average high 46 °F, low 22 °F 46°22° Dec

Precipitation by month inches · ❄ = snowfall

0″1″January: 0.67 in precipitation, 0.4 in snowfall 0.7 JanFebruary: 0.60 in precipitation, 0.5 in snowfall 0.6❄1 FebMarch: 0.44 in precipitation, 0.1 in snowfall 0.4 MarApril: 0.31 in precipitation 0.3 AprMay: 0.49 in precipitation 0.5 MayJune: 0.19 in precipitation 0.2 JunJuly: 0.54 in precipitation 0.5 JulAugust: 0.74 in precipitation 0.7 AugSeptember: 0.82 in precipitation 0.8 SepOctober: 0.66 in precipitation 0.7 OctNovember: 0.42 in precipitation, 0.1 in snowfall 0.4 NovDecember: 0.45 in precipitation, 1.2 in snowfall 0.5❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mexican Hat, UT (6 mi away); precipitation: Mexican Hat, UT (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

865357a
Dennehotso, AZ · 16 mi
845127a
Bluff, UT · 17 mi
845368a
Monument Valley, UT · 22 mi
865457a
Rock Point, AZ · 29 mi
865147a
Teec Nos Pos, AZ · 30 mi
845347a
Montezuma Creek, UT · 33 mi
860337a
Kayenta, AZ · 35 mi
845117a
Blanding, UT · 40 mi

Utah planting zones →

Questions about 84531

What planting zone is ZIP code 84531?

ZIP code 84531 (Mexican Hat, 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 Mexican Hat, UT?

The median last spring frost (32 °F) near 84531 is April 11; after April 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mexican Hat station.

When is the first frost in Mexican Hat, UT?

The median first fall frost near 84531 is October 30, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 84531?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 84531 get?

About 6.3 inches of precipitation a year and 2 inches of snowfall (NOAA 1991–2020 normals, Mexican Hat station).

How hot do summers get in Mexican Hat, UT?

The average high peaks at 99 °F in July, with about 103 days a year at 90 °F or more.

What kind of soil does 84531 have?

The USDA soil survey maps Moenkopie at the center of ZIP 84531: sandy loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Mexican Hat, UT in 2026?

Spring leaf-out near 84531 came on Mar 1 in 2026, 11 days earlier than the 1991–2020 average (Mar 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mexican Hat, UT?

Intermediate onions: the longest day near 84531 is 14 h 43 min, so day-neutral types bulb best; long-day varieties may not bulb fully.