Whetstone, Arizona, sits in USDA hardiness zone 8b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Whetstone, 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 Whetstone 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 Whetstone — soil, climate, flood, and parcel records. How we handle your address.
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Whetstone — the short answer
Whetstone, Arizona: USDA zone 8b, about 271 days between hard freezes, across 60K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~271
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 60K 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 Whetstone's average, not your lot's — a low corner or a tree line moves it. Against Whetstone's 271-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Whetstone
Each reading below is measured for Whetstone itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWhetstone runs about 271 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
MeasuredWhetstone 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 Whetstone is in
Whetstone sits in the Madrean Archipelago — EPA Level III, inside the wider Southern Semi-arid Highlands. That is read at Whetstone's own centroid rather than borrowed from Cochise County.
What Grows in Whetstone
Every plant below cleared Whetstone's own zone 8b and its 271-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Whetstone?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 28 — 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 Whetstone
Survey cells within 31 miles of Whetstone checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 413 miles off. What to watch for.
What's on the federal record near Whetstone
Closest first, within ~10 miles of Whetstone. Listing isn't leaking, and distance isn't exposure.
- D-20-20 06CCA1Nitrate · 3.2 mi
- D-20-20 07BBDNitrate · 3.2 mi
- D-20-20 07BBD2Nitrate · 3.3 mi
- MUSTANG CORNERSUnderground Storage Tanks · 3.8 mi
- MUSTANG MOUNTAIN TEXACO FOOD MARTUnderground Storage Tanks · 3.8 mi
- D-20-20 18CCCNitrate · 3.9 mi
- D-20-21 05CAA1Nitrate · 4.0 mi
- SANDY'S SHORT STOPUnderground Storage Tanks · 4.2 mi
- COCHISE SANITATIONUnderground Storage Tanks · 4.5 mi
- D-20-20 35CCB1 [TW-6]Nitrate · 5.1 mi
- D-20-19 14BABNitrate · 5.3 mi
- D-20-20 32DCB2Nitrate · 5.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Whetstone'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 Whetstone.
Sources Checked
within ~10 miles of Whetstone
Severity Distribution
within ~10 miles of Whetstone
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Whetstone, two things run higher than the national average within ~10 miles of Whetstone — Mining (21 sites) and Nitrate (30 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Whetstone
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 Whetstone average
Your land is one point inside Whetstone
Everything above resolves to Whetstone as a whole — one PHZM band and one 28°F frost record, read across 60K 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 Whetstone Average
Whetstone Average
- ●USDA Zones 8b, averaged across Whetstone
- ●One soil character for all of Whetstone
- ●Frost dates read at Whetstone's scale: Mar 2 to Nov 28
YOUR Parcel
- ✓Your exact zone, not Whetstone's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Whetstone
Pull a site-specific report for your exact address in Whetstone, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Whetstone averages can't show:
We read public map data around Whetstone — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Whetstone average
How we know this about Whetstone
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 Whetstone’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 Whetstone
When does frost risk typically end in Whetstone?
The last hard freeze (28°F) in Whetstone typically lands around Mar 2, 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 23.
When is the first frost in Whetstone?
The first hard freeze (28°F) in Whetstone typically arrives around Nov 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 14, so the watching starts about Oct 29 — about 271 days after the spring freeze cleared.
How long is the growing season in Whetstone?
Measured between 28°F hard freezes, Whetstone sees about 271 frost-free days — roughly Mar 2 through Nov 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 23 to Nov 14, about 236 days.
Is the soil safe to grow vegetables in Whetstone?
The federal record around Whetstone runs heavier than most — 68 documented sites, mostly Nitrate entries (30), the nearest Nitrate record about 3.2 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 Whetstone?
From about Oct 29 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Whetstone's scale — its 8b band and its 271-day season. Your yard writes its own version of Whetstone'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 Whetstone’s own scale
7 of the readings below were taken at Whetstone's own scale — its own ~271-day season between 28°F freezes, the 60,132 acres it covers and 68 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Whetstone's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Whetstone's own 28°F hard-freeze dates, about Mar 2 and Nov 28 and the ~271-day span between themNOAA 1991–2020 Climate Normals
- 68 documented contamination sites on the federal record near Whetstone, the closest Nitrate record about 3.2 miles out from the town centreFederal environmental registers
- Whetstone's boundary and the 60,132 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~271-day seasonGrowable Ground crop-matching engine
- The ecoregion at Whetstone's own centroid, the Madrean ArchipelagoUS EPA Level III Ecoregions
- Lanternfly survey cells around Whetstone 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 Whetstone's 60,132 acres read through its county's SSURGO summaryfrom Cochise County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cochise 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 Cochise County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Whetstone's 60,132 acreswhy one lot differs from the next →
- Which side of Whetstone you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 60,132 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 3.2 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 Whetstone-wide figureread your own land →