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

Planting zone for 85310 — Glendale, AZ

ZIP code 85310 (Glendale, Maricopa County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 85310 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 zone9b

Was 9b on the 2012 map — half a zone warmer now. 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 Glendale, 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 Phoenix Deer Valley Municipal Airport, AZ — 4 miles away, elevation 1,457 ft) the median growing season is 354 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 85310 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 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.

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 Glendale, AZ.

Soil in Glendale, AZ

The soil mapped at the center of ZIP 85310 is Laveen — loam, well drained.

TextureLoama good balance for most vegetables

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.65%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Laveen loam, 0 to 1 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 85310; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glendale, AZ

Summer high104 °Faverage high, July

Winter low43 °Faverage low, December

Hot days159days a year at 90 °F or more

Freezing nights3nights a year at 32 °F or less

Growing degree days8,306base 50 °F — the season’s usable heat

Longest day14 h 24 mindaylight on June 21

Shortest day9 h 55 mindaylight on December 21

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

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: Phoenix Deer Valley Municipal Airport, AZ (4 mi away); precipitation: Glendale 12.2 N, AZ (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

All 12 ZIP codes in Glendale → · Arizona planting zones →

Questions about 85310

What planting zone is ZIP code 85310?

ZIP code 85310 (Glendale, 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 85310 get?

About 9.3 inches of precipitation a year (NOAA 1991–2020 normals, Glendale 12.2 N station).

How hot do summers get in Glendale, AZ?

The average high peaks at 104 °F in July, with about 159 days a year at 90 °F or more.

What kind of soil does 85310 have?

The USDA soil survey maps Laveen at the center of ZIP 85310: loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Glendale, AZ in 2026?

Spring leaf-out near 85310 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 Glendale, AZ?

Intermediate onions: the longest day near 85310 is 14 h 24 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 85310 change?

Yes. The 2012 USDA map put 85310 in zone 9b; the 2023 map puts it in zone 10a. The newer map uses 1991–2020 data and more weather stations.