Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 86438 — Yucca, AZ

ZIP code 86438 (Yucca, Mohave County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 18 and the first fall frost December 2.

Where ZIP 86438 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.

Zone9a20 to 25 °F

Coldest night−6.7 to −3.9 °C

Last frostFeb 18

First frostDec 2

2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Yucca, 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 in Yucca, AZ

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostFebruary 18median — 50% chance of a later frost

Safe for tender plantsMarch 16only 10% chance of frost after

First fall frostDecember 2median — 10% chance by Nov 16

Growing season288 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 19 and returns around December 16.

From the NOAA station Yucca 1 Nne, AZ — 16 miles away, elevation 1,949 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 86438

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 7 – Jan 21

SpinachSow outdoors · Jan 7 – Jan 28

Broccoli, cabbageStart indoors · Dec 10 – Dec 24

Broccoli, cabbageTransplant · Jan 28 – Feb 11

Onion setsPlant outdoors · Jan 21 – Feb 4

PotatoesPlant outdoors · Jan 28 – Feb 11

LettuceSow outdoors · Jan 21 – Feb 4

Carrots, beetsSow outdoors · Jan 28 – Feb 11

TomatoesStart indoors · Dec 24 – Jan 7

TomatoesTransplant · Feb 25 – Mar 11

Peppers, eggplantStart indoors · Dec 10 – Dec 24

Peppers, eggplantTransplant · Mar 4 – Mar 18

BeansSow outdoors · Feb 25 – Mar 11

Sweet cornSow outdoors · Feb 25 – Mar 11

Cucumbers, squashSow outdoors · Feb 25 – Mar 11

Fall lettuce, spinachSow outdoors · Oct 7 – Oct 21

GarlicPlant cloves · Nov 18 – Dec 23

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 18) and first fall frost (Dec 2) 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 86438 came on Jan 22 — 7 days earlier than the 1991–2020 average (Jan 29).

average
Jan 292026
Jan 22

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 9a in Arizona

492 plants native to the lower 48 states, recorded in Arizona, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

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 Yucca, AZ.

Soil in Yucca, AZ

The soil mapped at the center of ZIP 86438 is Lostman — 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: Lostman-Kinley complex, 1 to 7 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 86438; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Yucca, AZ

Summer high103 °Faverage high, July

Winter low37 °Faverage low, December

Hot days150days a year at 90 °F or more

Freezing nights15nights a year at 32 °F or less

Growing degree days6,978base 50 °F — the season’s usable heat

Longest day14 h 29 mindaylight on June 21

Shortest day9 h 50 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation6.7 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Yucca 1 Nne, AZ (16 mi away); precipitation: Yucca 1 Nne, AZ (16 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

8640410a

Lake Havasu City, AZ · 19 mi

8640610a

Lake Havasu City, AZ · 21 mi

8640510a

Lake Havasu City, AZ · 24 mi

864369b

Topock, AZ · 25 mi

8640310a

Lake Havasu City, AZ · 25 mi

Parker Dam, CA · 29 mi

Arizona planting zones →

Questions about 86438

What planting zone is ZIP code 86438?

ZIP code 86438 (Yucca, AZ) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Yucca, AZ?

The median last spring frost (32 °F) near 86438 is February 18; after March 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Yucca 1 Nne station.

When is the first frost in Yucca, AZ?

The median first fall frost near 86438 is December 2, giving a median frost-free growing season of 288 days.

When should I plant tomatoes in 86438?

Start tomato seeds indoors around Dec 24 – Jan 7 and set transplants outside around Feb 25 – Mar 11, one to three weeks after the median last frost.

How much rain and snow does 86438 get?

About 6.7 inches of precipitation a year (NOAA 1991–2020 normals, Yucca 1 Nne station).

How hot do summers get in Yucca, AZ?

The average high peaks at 103 °F in July, with about 150 days a year at 90 °F or more.

What kind of soil does 86438 have?

The USDA soil survey maps Lostman at the center of ZIP 86438: sandy loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Yucca, AZ in 2026?

Spring leaf-out near 86438 came on Jan 22 in 2026, 7 days earlier than the 1991–2020 average (Jan 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Yucca, AZ?

Intermediate onions: the longest day near 86438 is 14 h 29 min, so day-neutral types bulb best; long-day varieties may not bulb fully.