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

Planting zone for 84533 — Lake Powell, UT

ZIP code 84533 (Lake Powell, San Juan County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 25 and the first fall frost November 10.

Where ZIP 84533 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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 25
First frostNov 10
2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Lake Powell, 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 Lake Powell, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 25median — 50% chance of a later frost
Safe for tender plantsApril 12only 10% chance of frost after
First fall frostNovember 10median — 10% chance by Oct 26
Growing season227 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 6 and returns around November 20.

From the NOAA station Bullfrog Basin, UT — 13 miles away, elevation 3,822 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 84533

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 11 – Feb 25
SpinachSow outdoors · Feb 11 – Mar 4
Broccoli, cabbageStart indoors · Jan 14 – Jan 28
Broccoli, cabbageTransplant · Mar 4 – Mar 18
Onion setsPlant outdoors · Feb 25 – Mar 11
PotatoesPlant outdoors · Mar 4 – Mar 18
LettuceSow outdoors · Feb 25 – Mar 11
Carrots, beetsSow outdoors · Mar 4 – Mar 18
TomatoesStart indoors · Jan 28 – Feb 11
TomatoesTransplant · Apr 1 – Apr 15
Peppers, eggplantStart indoors · Jan 14 – Jan 28
Peppers, eggplantTransplant · Apr 8 – Apr 22
BeansSow outdoors · Apr 1 – Apr 15
Sweet cornSow outdoors · Apr 1 – Apr 15
Cucumbers, squashSow outdoors · Apr 1 – Apr 15
Fall lettuce, spinachSow outdoors · Sep 15 – Sep 29
GarlicPlant cloves · Oct 27 – Dec 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 25) and first fall frost (Nov 10) 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 84533 came on Feb 24 — 12 days earlier than the 1991–2020 average (Mar 8).

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 8a in Utah

575 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. Each links to its USDA PLANTS profile.

Trees 31

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 116

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 260

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 Lake Powell, UT.

Soil in Lake Powell, UT

The soil mapped at the center of ZIP 84533 is Piute — loamy fine sand, well drained.

TextureLoamy fine sanddrains and warms fast; dries out and needs more feeding
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.25%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Rock outcrop-Piute-Sheppard complex.

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 84533; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lake Powell, UT

Summer high100 °Faverage high, July
Winter low26 °Faverage low, January
Hot days106days a year at 90 °F or more
Freezing nights95nights a year at 32 °F or less
Growing degree days4,917base 50 °F — the season’s usable heat
Longest day14 h 45 mindaylight on June 21
Shortest day9 h 35 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation6.4 inper year, rain and melted snow
Snowfall4 inper year; 3 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 46 °F, low 26 °F 46°26° JanFebruary: average high 53 °F, low 30 °F 53°30° FebMarch: average high 63 °F, low 36 °F 63°36° MarApril: average high 72 °F, low 44 °F 72°44° AprMay: average high 82 °F, low 53 °F 82°53° MayJune: average high 94 °F, low 64 °F 94°64° JunJuly: average high 100 °F, low 71 °F 100°71° JulAugust: average high 97 °F, low 69 °F 97°69° AugSeptember: average high 88 °F, low 60 °F 88°60° SepOctober: average high 74 °F, low 46 °F 74°46° OctNovember: average high 58 °F, low 34 °F 58°34° NovDecember: average high 46 °F, low 26 °F 46°26° Dec

Precipitation by month inches · ❄ = snowfall

0″1″January: 0.63 in precipitation, 0.9 in snowfall 0.6❄1 JanFebruary: 0.53 in precipitation, 0.8 in snowfall 0.5❄1 FebMarch: 0.65 in precipitation, 0.3 in snowfall 0.7 MarApril: 0.34 in precipitation 0.3 AprMay: 0.44 in precipitation 0.4 MayJune: 0.15 in precipitation 0.1 JunJuly: 0.59 in precipitation 0.6 JulAugust: 0.54 in precipitation 0.5 AugSeptember: 0.81 in precipitation 0.8 SepOctober: 0.81 in precipitation 0.8 OctNovember: 0.53 in precipitation, 0.2 in snowfall 0.5 NovDecember: 0.42 in precipitation, 1.8 in snowfall 0.4❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bullfrog Basin, UT (13 mi away); precipitation: Bullfrog Basin, UT (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

845368a
Monument Valley, UT · 26 mi
845317b
Mexican Hat, UT · 46 mi
860447a
Tonalea, AZ · 49 mi
860547a
Shonto, AZ · 51 mi
860337a
Kayenta, AZ · 53 mi
860537b
Kaibeto, AZ · 53 mi
865357a
Dennehotso, AZ · 55 mi
847167a
Boulder, UT · 62 mi

Utah planting zones →

Questions about 84533

What planting zone is ZIP code 84533?

ZIP code 84533 (Lake Powell, UT) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Lake Powell, UT?

The median last spring frost (32 °F) near 84533 is March 25; after April 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bullfrog Basin station.

When is the first frost in Lake Powell, UT?

The median first fall frost near 84533 is November 10, giving a median frost-free growing season of 227 days.

When should I plant tomatoes in 84533?

Start tomato seeds indoors around Jan 28 – Feb 11 and set transplants outside around Apr 1 – Apr 15, one to three weeks after the median last frost.

How much rain and snow does 84533 get?

About 6.4 inches of precipitation a year and 4 inches of snowfall (NOAA 1991–2020 normals, Bullfrog Basin station).

How hot do summers get in Lake Powell, UT?

The average high peaks at 100 °F in July, with about 106 days a year at 90 °F or more.

What kind of soil does 84533 have?

The USDA soil survey maps Piute at the center of ZIP 84533: loamy fine sand, well drained, pH about 7.9 (alkaline).

Did spring come early in Lake Powell, UT in 2026?

Spring leaf-out near 84533 came on Feb 24 in 2026, 12 days earlier than the 1991–2020 average (Mar 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Lake Powell, UT?

Intermediate onions: the longest day near 84533 is 14 h 45 min, so day-neutral types bulb best; long-day varieties may not bulb fully.