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

Planting zone for 84403 — Ogden, UT

ZIP code 84403 (Ogden, Weber County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 19 and the first fall frost October 22.

Where ZIP 84403 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 frostApr 19
First frostOct 22
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 Ogden, 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 Ogden, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 19median — 50% chance of a later frost
Safe for tender plantsMay 4only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 7
Growing season186 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 1.

From the NOAA station Ogden Ne Bench, UT — 3 miles away, elevation 4,574 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 84403

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 8 – Mar 22
SpinachSow outdoors · Mar 8 – Mar 29
Broccoli, cabbageStart indoors · Feb 8 – Feb 22
Broccoli, cabbageTransplant · Mar 29 – Apr 12
Onion setsPlant outdoors · Mar 22 – Apr 5
PotatoesPlant outdoors · Mar 29 – Apr 12
LettuceSow outdoors · Mar 22 – Apr 5
Carrots, beetsSow outdoors · Mar 29 – Apr 12
TomatoesStart indoors · Feb 22 – Mar 8
TomatoesTransplant · Apr 26 – May 10
Peppers, eggplantStart indoors · Feb 8 – Feb 22
Peppers, eggplantTransplant · May 3 – May 17
BeansSow outdoors · Apr 26 – May 10
Sweet cornSow outdoors · Apr 26 – May 10
Cucumbers, squashSow outdoors · Apr 26 – May 10
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 19) and first fall frost (Oct 22) 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 84403 came on Apr 11 — 19 days earlier than the 1991–2020 average (Apr 30).

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 Ogden, UT.

Soil in Ogden, UT

The soil mapped at the center of ZIP 84403 is Nagitsy — cobbly loam, well drained.

TextureCobbly loama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Nagitsy-Patio-Rock outcrop association, very steep.

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 84403; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ogden, UT

Summer high89 °Faverage high, July
Winter low22 °Faverage low, January
Hot days38days a year at 90 °F or more
Freezing nights116nights a year at 32 °F or less
Growing degree days3,024base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 12 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation24.9 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 22 °F 37°22° JanFebruary: average high 42 °F, low 27 °F 42°27° FebMarch: average high 52 °F, low 33 °F 52°33° MarApril: average high 59 °F, low 39 °F 59°39° AprMay: average high 69 °F, low 48 °F 69°48° MayJune: average high 80 °F, low 55 °F 80°55° JunJuly: average high 89 °F, low 62 °F 89°62° JulAugust: average high 88 °F, low 61 °F 88°61° AugSeptember: average high 76 °F, low 53 °F 76°53° SepOctober: average high 62 °F, low 41 °F 62°41° OctNovember: average high 49 °F, low 31 °F 49°31° NovDecember: average high 38 °F, low 24 °F 38°24° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.15 in precipitation 3.1 JanFebruary: 2.06 in precipitation 2.1 FebMarch: 2.64 in precipitation 2.6 MarApril: 2.56 in precipitation 2.6 AprMay: 2.69 in precipitation 2.7 MayJune: 1.65 in precipitation 1.6 JunJuly: 0.61 in precipitation 0.6 JulAugust: 0.95 in precipitation 0.9 AugSeptember: 1.68 in precipitation 1.7 SepOctober: 2.11 in precipitation 2.1 OctNovember: 1.82 in precipitation 1.8 NovDecember: 3.03 in precipitation 3.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ogden Ne Bench, UT (3 mi away); precipitation: Ogden Ne Bench, UT (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

844086b
Ogden, UT · 3 mi
844077a
Ogden, UT · 4 mi
842447a
Ogden, UT · 4 mi
844027a
Ogden, UT · 4 mi
844097a
Ogden, UT · 4 mi
844127a
Ogden, UT · 4 mi
844156b
Ogden, UT · 4 mi
844057a
Ogden, UT · 6 mi

All 12 ZIP codes in Ogden → · Utah planting zones →

Questions about 84403

What planting zone is ZIP code 84403?

ZIP code 84403 (Ogden, 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 Ogden, UT?

The median last spring frost (32 °F) near 84403 is April 19; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ogden Ne Bench station.

When is the first frost in Ogden, UT?

The median first fall frost near 84403 is October 22, giving a median frost-free growing season of 186 days.

When should I plant tomatoes in 84403?

Start tomato seeds indoors around Feb 22 – Mar 8 and set transplants outside around Apr 26 – May 10, one to three weeks after the median last frost.

How much rain and snow does 84403 get?

About 24.9 inches of precipitation a year (NOAA 1991–2020 normals, Ogden Ne Bench station).

How hot do summers get in Ogden, UT?

The average high peaks at 89 °F in July, with about 38 days a year at 90 °F or more.

What kind of soil does 84403 have?

The USDA soil survey maps Nagitsy at the center of ZIP 84403: cobbly loam, well drained, pH about 6.5 (neutral).

Did spring come early in Ogden, UT in 2026?

Spring leaf-out near 84403 came on Apr 11 in 2026, 19 days earlier than the 1991–2020 average (Apr 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ogden, UT?

Long-day onions: the longest day near 84403 is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).