Thatcher, Arizona, sits in USDA hardiness zone 8b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Thatcher, 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 Thatcher 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 Thatcher — soil, climate, flood, and parcel records. How we handle your address.
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Thatcher — the short answer
Thatcher, Arizona: USDA zone 8b, about 266 days between hard freezes, across 4K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~266
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K 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 Thatcher's average, not your lot's — a low corner or a tree line moves it. Against Thatcher's 266-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Thatcher
Each reading below is measured for Thatcher itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredThatcher runs about 266 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
MeasuredThatcher 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 Thatcher is in
Thatcher sits in the Chihuahuan Deserts — EPA Level III, inside the wider North American Deserts. That is read at Thatcher'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 Thatcher
Every plant below cleared Thatcher's own zone 8b and its 266-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Thatcher?
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 29; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 19 — 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 Thatcher
Survey cells within 31 miles of Thatcher checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 430 miles off. What to watch for.
What's on the federal record near Thatcher
Closest first, within ~10 miles of Thatcher. Listing isn't leaking, and distance isn't exposure.
- FRONTIER MARKETUnderground Storage Tanks · 2000 ft
- CITY OF SAFFORD - MOUNT GRAHAM GOLF COURSEUnderground Storage Tanks · 2600 ft
- SAFFORD CITY OFPFAS · 1.2 mi
- GRAHAM COUNTY - HIGHWAY DEPARTMENTUnderground Storage Tanks · 1.5 mi
- D-07-25 27DCCNitrate · 1.8 mi
- MOUNT GRAHAM REGIONAL MEDICAL CENTERUnderground Storage Tanks · 2.0 mi
- WAL-MART SUPERCENTER 1149Brownfields · 2.4 mi
- HOME DEPOT 0445Brownfields · 2.4 mi
- EASTERN ARIZONA COLLEGEUnderground Storage Tanks · 2.4 mi
- ROMNEY IMPLEMENTUnderground Storage Tanks · 2.5 mi
- EA SERVICE & FUELUnderground Storage Tanks · 2.5 mi
- SPEEDWAY STORE #2971Underground Storage Tanks · 2.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Thatcher'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 Thatcher.
Total Sites
146
within ~10 miles of Thatcher
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Thatcher
Severity Distribution
within ~10 miles of Thatcher
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Thatcher, Nitrate runs higher than the national average — 38 sites within ~10 miles of Thatcher. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Thatcher
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 Thatcher average
Your land is one point inside Thatcher
Everything above resolves to Thatcher as a whole — one PHZM band and one 28°F frost record, read across 4K 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 Thatcher Average
Thatcher Average
- ●USDA Zones 8b, averaged across Thatcher
- ●One soil character for all of Thatcher
- ●Frost dates read at Thatcher's scale: Feb 26 to Nov 19
YOUR Parcel
- ✓Your exact zone, not Thatcher's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Thatcher
Pull a site-specific report for your exact address in Thatcher, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Thatcher averages can't show:
We read public map data around Thatcher — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Thatcher average
How we know this about Thatcher
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 Thatcher’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 Thatcher
When does frost risk typically end in Thatcher?
The last hard freeze (28°F) in Thatcher typically lands around Feb 26, 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 19.
When is the first frost in Thatcher?
The first hard freeze (28°F) in Thatcher typically arrives around Nov 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 5, so the watching starts about Oct 20 — about 266 days after the spring freeze cleared.
How long is the growing season in Thatcher?
Measured between 28°F hard freezes, Thatcher sees about 266 frost-free days — roughly Feb 26 through Nov 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 19 to Nov 5, about 231 days.
Is the soil safe to grow vegetables in Thatcher?
The federal record around Thatcher is a meaningful one — 146 documented sites, mostly Underground Storage Tanks entries (86), the nearest Underground Storage Tanks record about 0.4 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 Thatcher?
From about Oct 20 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 19 (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 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Thatcher's scale — its 8b band and its 266-day season. Your yard writes its own version of Thatcher'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 Thatcher’s own scale
7 of the readings below were taken at Thatcher's own scale — its own ~266-day season between 28°F freezes, the 4,263 acres it covers and 146 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Thatcher's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Thatcher's own 28°F hard-freeze dates, about Feb 26 and Nov 19 and the ~266-day span between themNOAA 1991–2020 Climate Normals
- 146 documented contamination sites on the federal record near Thatcher, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Thatcher's boundary and the 4,263 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~266-day seasonGrowable Ground crop-matching engine
- Thatcher sits in the Chihuahuan Deserts — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around Thatcher 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 Thatcher's 4,263 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 Thatcher's 4,263 acreswhy one lot differs from the next →
- Which side of Thatcher you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,263 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Thatcher-wide figureread your own land →
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