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

Planting zone for 85341 — Lukeville, AZ

ZIP code 85341 (Lukeville, Pima County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 4 and the first fall frost December 15.

Where ZIP 85341 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.

Zone9b25 to 30 °F

Coldest night−3.9 to −1.1 °C

Last frostFeb 4

First frostDec 15

2012 zone9b

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 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Lukeville, 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 Lukeville, AZ

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostFebruary 4median — 50% chance of a later frost

Safe for tender plantsMarch 3only 10% chance of frost after

First fall frostDecember 15median — 10% chance by Nov 26

Growing season314 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 18 and returns around January 5.

From the NOAA station Organ Pipe Cactus Nm, AZ — 5 miles away, elevation 1,680 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 85341

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Dec 24 – Jan 7

SpinachSow outdoors · Dec 24 – Jan 14

Broccoli, cabbageStart indoors · Nov 26 – Dec 10

Broccoli, cabbageTransplant · Jan 14 – Jan 28

Onion setsPlant outdoors · Jan 7 – Jan 21

PotatoesPlant outdoors · Jan 14 – Jan 28

LettuceSow outdoors · Jan 7 – Jan 21

Carrots, beetsSow outdoors · Jan 14 – Jan 28

TomatoesStart indoors · Dec 10 – Dec 24

TomatoesTransplant · Feb 11 – Feb 25

Peppers, eggplantStart indoors · Nov 26 – Dec 10

Peppers, eggplantTransplant · Feb 18 – Mar 4

BeansSow outdoors · Feb 11 – Feb 25

Sweet cornSow outdoors · Feb 11 – Feb 25

Cucumbers, squashSow outdoors · Feb 11 – Feb 25

Fall lettuce, spinachSow outdoors · Oct 20 – Nov 3

GarlicPlant cloves · Dec 1 – Jan 5

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 4) and first fall frost (Dec 15) 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 85341 came on Jan 20 — 4 days earlier than the 1991–2020 average (Jan 24).

average
Jan 242026
Jan 20

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 9b in Arizona

499 plants native to the lower 48 states, recorded in Arizona, and rated by the USDA to survive 25 °F or colder — the bottom of zone 9b. 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 Lukeville, AZ.

Soil in Lukeville, AZ

The soil mapped at the center of ZIP 85341 is Cipriano — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.25%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Cipriano gravelly loam.

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 85341; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lukeville, AZ

Summer high104 °Faverage high, July

Winter low41 °Faverage low, January

Hot days175days a year at 90 °F or more

Freezing nights8nights a year at 32 °F or less

Growing degree days8,091base 50 °F — the season’s usable heat

Longest day14 h 15 mindaylight on June 21

Shortest day10 h 03 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation9.3 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: Organ Pipe Cactus Nm, AZ (5 mi away); precipitation: Organ Pipe Cactus Nm, AZ (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Gila Bend, AZ · 70 mi

Casa Grande, AZ · 77 mi

Arizona planting zones →

Questions about 85341

What planting zone is ZIP code 85341?

ZIP code 85341 (Lukeville, AZ) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

When is the last frost in Lukeville, AZ?

The median last spring frost (32 °F) near 85341 is February 4; after March 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Organ Pipe Cactus Nm station.

When is the first frost in Lukeville, AZ?

The median first fall frost near 85341 is December 15, giving a median frost-free growing season of 314 days.

When should I plant tomatoes in 85341?

Start tomato seeds indoors around Dec 10 – Dec 24 and set transplants outside around Feb 11 – Feb 25, one to three weeks after the median last frost.

How much rain and snow does 85341 get?

About 9.3 inches of precipitation a year (NOAA 1991–2020 normals, Organ Pipe Cactus Nm station).

How hot do summers get in Lukeville, AZ?

The average high peaks at 104 °F in July, with about 175 days a year at 90 °F or more.

What kind of soil does 85341 have?

The USDA soil survey maps Cipriano at the center of ZIP 85341: gravelly loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Lukeville, AZ in 2026?

Spring leaf-out near 85341 came on Jan 20 in 2026, 4 days earlier than the 1991–2020 average (Jan 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Lukeville, AZ?

Short-day onions: the longest day near 85341 is 14 h 15 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.