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

Planting zone for 85365 — Yuma, AZ

ZIP code 85365 (Yuma, Yuma County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F.

Where ZIP 85365 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 frostrare

First frostrare

2012 zone10a

Was 10a on the 2012 map — a full zone colder now. 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 Yuma, 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 Yuma 27 Ene, AZ — 14 miles away, elevation 620 ft) the median growing season is 347 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 85365 came on Jan 20 — 7 days earlier than the 1991–2020 average (Jan 27).

average
Jan 272026
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 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 Yuma, AZ.

Soil in Yuma, AZ

The soil mapped at the center of ZIP 85365 is Hyder — very gravelly loam, somewhat excessively drained.

TextureVery gravelly loama good balance for most vegetables

pH8.0alkaline; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter0.3%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Hyder-Plomosa-Rock outcrop complex, 3 to 70 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 85365; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Yuma, AZ

Summer high106 °Faverage high, July

Winter low42 °Faverage low, December

Hot days174days a year at 90 °F or more

Freezing nights5nights a year at 32 °F or less

Growing degree days8,521base 50 °F — the season’s usable heat

Longest day14 h 20 mindaylight on June 21

Shortest day9 h 58 mindaylight on December 21

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

Precipitation4 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: Yuma 27 Ene, AZ (14 mi away); precipitation: Yuma 27 Ene, AZ (14 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.

All 5 ZIP codes in Yuma → · Arizona planting zones →

Questions about 85365

What planting zone is ZIP code 85365?

ZIP code 85365 (Yuma, 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).

How much rain and snow does 85365 get?

About 4 inches of precipitation a year (NOAA 1991–2020 normals, Yuma 27 Ene station).

How hot do summers get in Yuma, AZ?

The average high peaks at 106 °F in July, with about 174 days a year at 90 °F or more.

What kind of soil does 85365 have?

The USDA soil survey maps Hyder at the center of ZIP 85365: very gravelly loam, somewhat excessively drained, pH about 8.0 (alkaline).

Did spring come early in Yuma, AZ in 2026?

Spring leaf-out near 85365 came on Jan 20 in 2026, 7 days earlier than the 1991–2020 average (Jan 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Yuma, AZ?

Intermediate onions: the longest day near 85365 is 14 h 20 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 85365 change?

Yes. The 2012 USDA map put 85365 in zone 10a; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.