San Jose, Arizona, sits in USDA hardiness zone 8b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor cabbage, fig, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in San Jose, 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 San Jose 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 San Jose — soil, climate, flood, and parcel records. How we handle your address.
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San Jose — the short answer
San Jose, Arizona: USDA zone 8b, about 276 days between hard freezes, across 3K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~276
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 8b is San Jose's average, not your lot's — a low corner or a tree line moves it. Against San Jose's 276-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in San Jose
Each reading below is measured for San Jose itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSan Jose runs about 276 days between hard freezes — 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
MeasuredSan Jose sits in USDA hardiness zone 8b.
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 San Jose is in
San Jose sits in the Chihuahuan Deserts — EPA Level III, inside the wider North American Deserts. That is read at San Jose's own centroid, and it is not what its county reads: Graham County is mostly Madrean Archipelago. The wider page above you is answering a different question about different ground.
What Grows in San Jose
Every plant below cleared San Jose's own zone 8b and its 276-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in San Jose?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 26 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
Documented around San Jose
Survey cells within 31 miles of San Jose checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 440 miles off. What to watch for.
What's on the federal record near San Jose
Closest first, within ~10 miles of San Jose. Listing isn't leaking, and distance isn't exposure.
- ASP - SAFFORD COMPLEXUnderground Storage Tanks · 1.9 mi
- ARIZONA ARMY NATIONAL GUARD SAFFORD RANGESuperfund · 2.1 mi
- RANCHERO MARKETUnderground Storage Tanks · 2.1 mi
- GRAHAM COUNTY APN #10319043Underground Storage Tanks · 2.1 mi
- SOLOMON ELEMENTARY SCHOOLUnderground Storage Tanks · 2.2 mi
- D-07-26 13DCD3Nitrate · 2.3 mi
- Sol MineMining · 3.1 mi
- SolMining · 3.1 mi
- CITY OF SAFFORD - MUNICIPAL AIRPORTUnderground Storage Tanks · 3.4 mi
- FREEPORT MINERAL CORPORATION - CENTRAL ANALYTICAL SERVICE CENTERBrownfields · 3.6 mi
- D-07-27 02ADDNitrate · 3.7 mi
- IVANHOE TRAILER PARKUnderground Storage Tanks · 3.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from San Jose'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 San Jose.
Total Sites
119
within ~10 miles of San Jose
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of San Jose
Severity Distribution
within ~10 miles of San Jose
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around San Jose, Mining runs higher than the national average — 18 sites within ~10 miles of San Jose. That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in San Jose
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 San Jose average
Your land is one point inside San Jose
Everything above resolves to San Jose as a whole — one PHZM band and one 28°F frost record, read across 3K acres. 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 town 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 San Jose Average
San Jose Average
- ●USDA Zones 8b, averaged across San Jose
- ●One soil character for all of San Jose
- ●Frost dates read at San Jose's scale: Feb 23 to Nov 26
YOUR Parcel
- ✓Your exact zone, not San Jose's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in San Jose
Pull a site-specific report for your exact address in San Jose, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that San Jose averages can't show:
We read public map data around San Jose — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the San Jose average
How we know this about San Jose
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at San Jose’s own record; 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 town grain anywhere on this page — there is no town-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 San Jose
When does frost risk typically end in San Jose?
The last hard freeze (28°F) in San Jose typically lands around Feb 23, 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 Mar 16.
When is the first frost in San Jose?
The first hard freeze (28°F) in San Jose typically arrives around Nov 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 12, so the watching starts about Oct 27 — about 276 days after the spring freeze cleared.
How long is the growing season in San Jose?
Measured between 28°F hard freezes, San Jose sees about 276 frost-free days — roughly Feb 23 through Nov 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 16 to Nov 12, about 241 days.
Is the soil safe to grow vegetables in San Jose?
The federal record around San Jose is a meaningful one — 119 documented sites, mostly Underground Storage Tanks entries (68), the nearest Underground Storage Tanks record about 1.9 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in San Jose?
From about Oct 27 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 Nov 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 Nov 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at San Jose's scale — its 8b band and its 276-day season. Your yard writes its own version of San Jose'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 San Jose’s own scale
7 of the readings below were taken at San Jose's own scale — its own ~276-day season between 28°F freezes, the 2,685 acres it covers and 119 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- San Jose's own USDA hardiness band, zones 8bUSDA PHZM 2023
- San Jose's own 28°F hard-freeze dates, about Feb 23 and Nov 26 and the ~276-day span between themNOAA 1991–2020 Climate Normals
- 119 documented contamination sites on the federal record near San Jose, the closest Underground Storage Tanks record about 1.9 miles out from the town centreFederal environmental registers
- San Jose's boundary and the 2,685 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~276-day seasonGrowable Ground crop-matching engine
- San Jose sits in the Chihuahuan Deserts — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around San Jose checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so San Jose's 2,685 acres read through its county's SSURGO summaryfrom Graham County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Graham 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 Graham County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among San Jose's 2,685 acreswhy one lot differs from the next →
- Which side of San Jose you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,685 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 1.9 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 San Jose-wide figureread your own land →
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