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

Planting zone for 84023 — Dutch John, UT

ZIP code 84023 (Dutch John, Daggett County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 19 and the first fall frost September 28.

Where ZIP 84023 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 19
First frostSep 28
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Dutch John, 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 Dutch John, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 19median — 50% chance of a later frost
Safe for tender plantsJune 4only 10% chance of frost after
First fall frostSeptember 28median — 10% chance by Sep 14
Growing season132 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 2 and returns around October 10.

From the NOAA station Jarvie Rch, UT — 2 miles away, elevation 5,453 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 84023

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 7 – Apr 21
SpinachSow outdoors · Apr 7 – Apr 28
Broccoli, cabbageStart indoors · Mar 10 – Mar 24
Broccoli, cabbageTransplant · Apr 28 – May 12
Onion setsPlant outdoors · Apr 21 – May 5
PotatoesPlant outdoors · Apr 28 – May 12
LettuceSow outdoors · Apr 21 – May 5
Carrots, beetsSow outdoors · Apr 28 – May 12
TomatoesStart indoors · Mar 24 – Apr 7
TomatoesTransplant · May 26 – Jun 9
Peppers, eggplantStart indoors · Mar 10 – Mar 24
Peppers, eggplantTransplant · Jun 2 – Jun 16
BeansSow outdoors · May 26 – Jun 9
Sweet cornSow outdoors · May 26 – Jun 9
Cucumbers, squashSow outdoors · May 26 – Jun 9
Fall lettuce, spinachSow outdoors · Aug 3 – Aug 17
GarlicPlant cloves · Sep 14 – Oct 19
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 19) and first fall frost (Sep 28) 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 84023 came on Mar 19 — 22 days earlier than the 1991–2020 average (Apr 10).

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 5b in Utah

517 plants native to the lower 48 states, recorded in Utah, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 28

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 94

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 238

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 148

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 2

Virginia 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 Dutch John, UT.

Soil in Dutch John, UT

The soil mapped at the center of ZIP 84023 is Milok — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Milok sandy loam, 2 to 6 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 84023; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dutch John, UT

Summer high91 °Faverage high, July
Winter low13 °Faverage low, January
Hot days44days a year at 90 °F or more
Freezing nights182nights a year at 32 °F or less
Growing degree days2,379base 50 °F — the season’s usable heat
Longest day15 h 07 mindaylight on June 21
Shortest day9 h 14 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation10.5 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 13 °F 40°13° JanFebruary: average high 44 °F, low 18 °F 44°18° FebMarch: average high 55 °F, low 25 °F 55°25° MarApril: average high 62 °F, low 31 °F 62°31° AprMay: average high 72 °F, low 39 °F 72°39° MayJune: average high 83 °F, low 47 °F 83°47° JunJuly: average high 91 °F, low 54 °F 91°54° JulAugust: average high 88 °F, low 51 °F 88°51° AugSeptember: average high 79 °F, low 43 °F 79°43° SepOctober: average high 65 °F, low 32 °F 65°32° OctNovember: average high 50 °F, low 22 °F 50°22° NovDecember: average high 40 °F, low 13 °F 40°13° Dec

Precipitation by month inches

0″1″2″January: 0.60 in precipitation 0.6 JanFebruary: 0.54 in precipitation 0.5 FebMarch: 0.54 in precipitation 0.5 MarApril: 1.00 in precipitation 1.0 AprMay: 1.65 in precipitation 1.6 MayJune: 0.85 in precipitation 0.8 JunJuly: 0.72 in precipitation 0.7 JulAugust: 1.13 in precipitation 1.1 AugSeptember: 1.14 in precipitation 1.1 SepOctober: 1.31 in precipitation 1.3 OctNovember: 0.57 in precipitation 0.6 NovDecember: 0.46 in precipitation 0.5 Dec

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

840465b
Manila, UT · 30 mi
840785b
Vernal, UT · 34 mi
840355b
Jensen, UT · 34 mi
840796a
Vernal, UT · 35 mi
829015b
Rock Springs, WY · 35 mi
829385b
Mc Kinnon, WY · 38 mi
816406a
Maybell, CO · 40 mi
840856a
Whiterocks, UT · 43 mi

Utah planting zones →

Questions about 84023

What planting zone is ZIP code 84023?

ZIP code 84023 (Dutch John, UT) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Dutch John, UT?

The median last spring frost (32 °F) near 84023 is May 19; after June 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Jarvie Rch station.

When is the first frost in Dutch John, UT?

The median first fall frost near 84023 is September 28, giving a median frost-free growing season of 132 days.

When should I plant tomatoes in 84023?

Start tomato seeds indoors around Mar 24 – Apr 7 and set transplants outside around May 26 – Jun 9, one to three weeks after the median last frost.

How much rain and snow does 84023 get?

About 10.5 inches of precipitation a year (NOAA 1991–2020 normals, Jarvie Rch station).

How hot do summers get in Dutch John, UT?

The average high peaks at 91 °F in July, with about 44 days a year at 90 °F or more.

What kind of soil does 84023 have?

The USDA soil survey maps Milok at the center of ZIP 84023: sandy loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Dutch John, UT in 2026?

Spring leaf-out near 84023 came on Mar 19 in 2026, 22 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dutch John, UT?

Long-day onions: the longest day near 84023 is 15 h 07 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).