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

Planting zone for 86442 — Bullhead City, AZ

ZIP code 86442 (Bullhead City, Mohave County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 86442 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.

Zone10a30 to 35 °F
Coldest night−1.1 to 1.7 °C
Last frostrare
First frostrare
2012 zone10a

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 10a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Bullhead City, AZ…

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

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Bullhead City, AZ — 4 miles away, elevation 532 ft) the median growing season is 356 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 86442 came on Jan 17 — 7 days earlier than the 1991–2020 average (Jan 24).

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 10a in Arizona

506 plants native to the lower 48 states, recorded in Arizona, and rated by the USDA to survive 30 °F or colder — the bottom of zone 10a. Each links to its USDA PLANTS profile.

Trees 27

Arizona cypress50 ft · blooms spring · low shade tolerance · to −23 °FArizona madrone30 ft · blooms late spring · high shade tolerance · to −4 °FArizona sycamore80 ft · blooms early spring · high shade tolerance · to −8 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °F

Shrubs 118

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican tarwort3 ft · blooms late spring · high shade tolerance · to −23 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 199

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 century plant6 ft · blooms indeterminate · high shade tolerance · to 12 °F

Grasses 153

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °FArizona cottontop4 ft · blooms late summer · high shade tolerance · to −13 °FArizona fescue2 ft · blooms late spring · high shade tolerance · to −23 °F

Vines 1

western 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 Bullhead City, AZ.

Soil in Bullhead City, AZ

The soil mapped at the center of ZIP 86442 is Huevi — very gravelly loam, well drained.

TextureVery gravelly loama good balance for most vegetables
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: Huevi very gravelly loam, 2 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 86442; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bullhead City, AZ

Summer high111 °Faverage high, July
Winter low44 °Faverage low, December
Hot days186days a year at 90 °F or more
Freezing nights2nights a year at 32 °F or less
Growing degree days8,922base 50 °F — the season’s usable heat
Longest day14 h 31 mindaylight on June 21
Shortest day9 h 47 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation5.4 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°120°32 °FJanuary: average high 65 °F, low 45 °F 65°45° JanFebruary: average high 70 °F, low 47 °F 70°47° FebMarch: average high 79 °F, low 51 °F 79°51° MarApril: average high 87 °F, low 57 °F 87°57° AprMay: average high 96 °F, low 66 °F 96°66° MayJune: average high 107 °F, low 73 °F 107°73° JunJuly: average high 111 °F, low 81 °F 111°81° JulAugust: average high 109 °F, low 81 °F 109°81° AugSeptember: average high 103 °F, low 73 °F 103°73° SepOctober: average high 89 °F, low 61 °F 89°61° OctNovember: average high 74 °F, low 51 °F 74°51° NovDecember: average high 64 °F, low 44 °F 64°44° Dec

Precipitation by month inches

0″1″2″January: 1.01 in precipitation 1.0 JanFebruary: 1.15 in precipitation 1.1 FebMarch: 0.76 in precipitation 0.8 MarApril: 0.14 in precipitation 0.1 AprMay: 0.08 in precipitation 0.1 MayJune: 0.01 in precipitation 0.0 JunJuly: 0.23 in precipitation 0.2 JulAugust: 0.48 in precipitation 0.5 AugSeptember: 0.18 in precipitation 0.2 SepOctober: 0.50 in precipitation 0.5 OctNovember: 0.39 in precipitation 0.4 NovDecember: 0.47 in precipitation 0.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bullhead City, AZ (4 mi away); precipitation: Bullhead City, AZ (4 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.

864399b
Bullhead City, AZ · 4 mi
8643010a
Bullhead City, AZ · 4 mi
864269b
Fort Mohave, AZ · 5 mi
864279b
Fort Mohave, AZ · 6 mi
890299b
Laughlin, NV · 6 mi
8902810a
Laughlin, NV · 12 mi
864409b
Mohave Valley, AZ · 14 mi
864299b
Bullhead City, AZ · 14 mi

All 4 ZIP codes in Bullhead City → · Arizona planting zones →

Questions about 86442

What planting zone is ZIP code 86442?

ZIP code 86442 (Bullhead City, AZ) is in USDA hardiness zone 10a on the 2023 map: the coldest night of an average winter reaches 30 to 35 °F (−1.1 to 1.7 °C).

How much rain and snow does 86442 get?

About 5.4 inches of precipitation a year (NOAA 1991–2020 normals, Bullhead City station).

How hot do summers get in Bullhead City, AZ?

The average high peaks at 111 °F in July, with about 186 days a year at 90 °F or more.

What kind of soil does 86442 have?

The USDA soil survey maps Huevi at the center of ZIP 86442: very gravelly loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Bullhead City, AZ in 2026?

Spring leaf-out near 86442 came on Jan 17 in 2026, 7 days earlier than the 1991–2020 average (Jan 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bullhead City, AZ?

Intermediate onions: the longest day near 86442 is 14 h 31 min, so day-neutral types bulb best; long-day varieties may not bulb fully.