Glendale, Arizona, sits in USDA hardiness zone 9b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Crops well matched to these conditions include okra, meyer lemon, california poppy, and artichoke — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Glendale, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Glendale lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Glendale — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Glendale — the short answer
Glendale, Arizona: USDA zone 9b, about 345 days between hard freezes, across 43K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 15
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 26
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~345
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- City area
- 43K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Maricopa County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Glendale's average, not your lot's — a low corner or a tree line moves it. Against Glendale's 345-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Glendale
Each reading below is measured for Glendale itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsGlendale runs about 345 days between hard freezes (read from Maricopa County, the closest normal to Glendale) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredGlendale sits in USDA hardiness zone 9b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Glendale is in
Glendale sits in the Sonoran Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Glendale's own centroid rather than borrowed from Maricopa County.
What Grows in Glendale
Every plant below cleared Glendale's own zone 9b and its 345-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Glendale?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 26 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
Documented around Glendale
Survey cells within 31 miles of Glendale checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 289 miles off. What to watch for.
What's on the federal record near Glendale
Closest first, within ~10 miles of Glendale. Listing isn't leaking, and distance isn't exposure.
- A-02-02 07DBANitrate · 1100 ft
- A-02-02 08BBC1Nitrate · 1700 ft
- FAMILY DOLLAR #3692 - RELOBrownfields · 1700 ft
- PARASOL LAUNDRYUnderground Storage Tanks · 1900 ft
- 82287Nitrate · 2100 ft
- PRICE AUTO SALES AND AUTO BODYUnderground Storage Tanks · 2100 ft
- 82285Nitrate · 2200 ft
- 82273Nitrate · 2200 ft
- 82286Nitrate · 2200 ft
- 82282Nitrate · 2200 ft
- FATIMA MINI MARTUnderground Storage Tanks · 2300 ft
- 82280Nitrate · 2300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Glendale's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Glendale.
Sources Checked
within ~10 miles of Glendale
Severity Distribution
within ~10 miles of Glendale
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Glendale, Toxics Release Inventory runs higher than the national average — 263 sites within ~10 miles of Glendale. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Glendale
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Glendale average
Your land is one point inside Glendale
Everything above resolves to Glendale as a whole — one PHZM band, read across 43K acres, with hard-freeze dates borrowed from Maricopa County’s record because no 30-year normal resolves at this city’s own centroid. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Glendale Average
Glendale Average
- ●USDA Zones 9b, averaged across Glendale
- ●One soil character for all of Glendale
- ●Frost dates read at Glendale's scale: Jan 15 to Dec 26
YOUR Parcel
- ✓Your exact zone, not Glendale's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Glendale
Pull a site-specific report for your exact address in Glendale, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Glendale averages can't show:
We read public map data around Glendale — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Glendale average
How we know this about Glendale
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Maricopa County’s record, because none resolves here; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Glendale
When does frost risk typically end in Glendale?
The last hard freeze (28°F) in Glendale typically lands around Jan 15, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Feb 5.
When is the first frost in Glendale?
The first hard freeze (28°F) in Glendale typically arrives around Dec 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 12, so the watching starts about Nov 26 — about 345 days after the spring freeze cleared.
How long is the growing season in Glendale?
Measured between 28°F hard freezes, Glendale sees about 345 frost-free days — roughly Jan 15 through Dec 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 5 to Dec 12, about 310 days.
Is the soil safe to grow vegetables in Glendale?
The federal record around Glendale runs heavier than most — 3,962 documented sites, mostly Underground Storage Tanks entries (2,079), the nearest Nitrate record about 0.2 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Glendale?
From about Nov 26 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Dec 26 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Dec 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Glendale's scale — its 9b band and its 345-day season. Your yard writes its own version of Glendale's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Glendale’s own scale
6 of the readings below were taken at Glendale's own scale — the 43,038 acres it covers and 3,962 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Glendale's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 3,962 documented contamination sites on the federal record near Glendale, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Glendale's boundary and the 43,038 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~345-day seasonGrowable Ground crop-matching engine
- The ecoregion at Glendale's own centroid, the Sonoran Basin and RangeUS EPA Level III Ecoregions
- Lanternfly survey cells around Glendale checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Glendale has no normal of its own, so its county's is the closest measured readfrom Maricopa County
- Soil character — no town-scale survey exists, so Glendale's 43,038 acres read through its county's SSURGO summaryfrom Maricopa County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Maricopa County
- The growing challenges every Arizona grower plans around — written at state scale, so they stay on the state guidefrom Arizona
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Maricopa County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Glendale's 43,038 acreswhy one lot differs from the next →
- Which side of Glendale you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 43,038 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Glendale-wide figureread your own land →