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

Planting zone for 84739 — Joseph, UT

ZIP code 84739 (Joseph, Sevier County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is June 4 and the first fall frost September 21.

Where ZIP 84739 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostJun 4
First frostSep 21
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Joseph, 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 Joseph, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 4median — 50% chance of a later frost
Safe for tender plantsJune 21only 10% chance of frost after
First fall frostSeptember 21median — 10% chance by Sep 6
Growing season106 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 19 and returns around September 29.

From the NOAA station Fremont Indian Sp, UT — 7 miles away, elevation 5,919 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 84739

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 23 – May 7
SpinachSow outdoors · Apr 23 – May 14
Broccoli, cabbageStart indoors · Mar 26 – Apr 9
Broccoli, cabbageTransplant · May 14 – May 28
Onion setsPlant outdoors · May 7 – May 21
PotatoesPlant outdoors · May 14 – May 28
LettuceSow outdoors · May 7 – May 21
Carrots, beetsSow outdoors · May 14 – May 28
TomatoesStart indoors · Apr 9 – Apr 23
TomatoesTransplant · Jun 11 – Jun 25
Peppers, eggplantStart indoors · Mar 26 – Apr 9
Peppers, eggplantTransplant · Jun 18 – Jul 2
BeansSow outdoors · Jun 11 – Jun 25
Sweet cornSow outdoors · Jun 11 – Jun 25
Cucumbers, squashSow outdoors · Jun 11 – Jun 25
Fall lettuce, spinachSow outdoors · Jul 27 – Aug 10
GarlicPlant cloves · Sep 7 – Oct 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 4) and first fall frost (Sep 21) 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 84739 came on Mar 3 — 24 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).

Soil in Joseph, UT

The soil mapped at the center of ZIP 84739 is Annabella — very gravelly loamy sand, well drained.

TextureVery gravelly loamy sanddrains and warms fast; dries out and needs more feeding
pH8.0alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.5%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Annabella family, 5 to 15 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 84739; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Joseph, UT

Summer high90 °Faverage high, July
Winter low12 °Faverage low, January
Hot days45days a year at 90 °F or more
Freezing nights207nights a year at 32 °F or less
Growing degree days2,134base 50 °F — the season’s usable heat
Longest day14 h 52 mindaylight on June 21
Shortest day9 h 28 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation12.1 inper year, rain and melted snow
Snowfall45 inper year

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 12 °F 42°12° JanFebruary: average high 46 °F, low 16 °F 46°16° FebMarch: average high 55 °F, low 22 °F 55°22° MarApril: average high 61 °F, low 27 °F 61°27° AprMay: average high 71 °F, low 35 °F 71°35° MayJune: average high 83 °F, low 43 °F 83°43° JunJuly: average high 90 °F, low 51 °F 90°51° JulAugust: average high 88 °F, low 49 °F 88°49° AugSeptember: average high 80 °F, low 40 °F 80°40° SepOctober: average high 66 °F, low 29 °F 66°29° OctNovember: average high 53 °F, low 19 °F 53°19° NovDecember: average high 42 °F, low 12 °F 42°12° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.78 in precipitation, 11.5 in snowfall 0.8❄12 JanFebruary: 0.97 in precipitation, 7.9 in snowfall 1.0❄8 FebMarch: 0.85 in precipitation, 5.2 in snowfall 0.8❄5 MarApril: 1.14 in precipitation, 4.1 in snowfall 1.1❄4 AprMay: 1.19 in precipitation, 0.3 in snowfall 1.2 MayJune: 0.63 in precipitation 0.6 JunJuly: 1.23 in precipitation 1.2 JulAugust: 1.30 in precipitation 1.3 AugSeptember: 1.01 in precipitation 1.0 SepOctober: 1.21 in precipitation, 1 in snowfall 1.2❄1 OctNovember: 0.88 in precipitation, 5.4 in snowfall 0.9❄5 NovDecember: 0.89 in precipitation, 9.4 in snowfall 0.9❄9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Fremont Indian Sp, UT (7 mi away); precipitation: Fremont Indian Sp, UT (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

847246a
Elsinore, UT · 5 mi
847546a
Monroe, UT · 6 mi
847666a
Sevier, UT · 7 mi
847116a
Annabella, UT · 11 mi
847306a
Glenwood, UT · 13 mi
847506a
Marysvale, UT · 14 mi
846376b
Kanosh, UT · 15 mi
846446b
Meadow, UT · 15 mi

Utah planting zones →

Questions about 84739

What planting zone is ZIP code 84739?

ZIP code 84739 (Joseph, UT) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Joseph, UT?

The median last spring frost (32 °F) near 84739 is June 4; after June 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Fremont Indian Sp station.

When is the first frost in Joseph, UT?

The median first fall frost near 84739 is September 21, giving a median frost-free growing season of 106 days.

When should I plant tomatoes in 84739?

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

How much rain and snow does 84739 get?

About 12.1 inches of precipitation a year and 45 inches of snowfall (NOAA 1991–2020 normals, Fremont Indian Sp station).

How hot do summers get in Joseph, UT?

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

What kind of soil does 84739 have?

The USDA soil survey maps Annabella at the center of ZIP 84739: very gravelly loamy sand, well drained, pH about 8.0 (alkaline).

Did spring come early in Joseph, UT in 2026?

Spring leaf-out near 84739 came on Mar 3 in 2026, 24 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Joseph, UT?

Intermediate onions: the longest day near 84739 is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.