Supai, Arizona, sits in USDA hardiness zone 8b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Supai, 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 Supai 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 Supai — soil, climate, flood, and parcel records. How we handle your address.
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Supai — the short answer
Supai, Arizona: USDA zone 8b, about 265 days between hard freezes, across 1K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~265
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Supai's average, not your lot's — a low corner or a tree line moves it. Against Supai's 265-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Supai
Each reading below is measured for Supai itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSupai runs about 265 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
MeasuredSupai 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 Supai is in
Supai sits in the Arizona/New Mexico Plateau — EPA Level III, inside the wider North American Deserts. That is read at Supai's own centroid rather than borrowed from Coconino County.
What Grows in Supai
Every plant below cleared Supai's own zone 8b and its 265-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Supai?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Jan 31; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — 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.
What's on the federal record near Supai
Closest first, within ~10 miles of Supai. Listing isn't leaking, and distance isn't exposure.
- B-33-04 22 UNSURV [SUPAI WELL NO. 3]Nitrate · 450 ft
- B-33-04 23BCC2Nitrate · 1300 ft
- B-33-04 23BCC1Nitrate · 1300 ft
- Bridal Veil ClaimMining · 0.5 mi
- Bridal Veil MinesMining · 2.1 mi
- Carbonate Canyon CalciteMining · 2.1 mi
- B-32-04 24CDA2Nitrate · 6.4 mi
- Bar Four WellNitrate · 6.4 mi
Measured from Supai'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 Supai.
Severity Distribution
within ~10 miles of Supai
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Mine waste leaches heavy metals. Test for lead, arsenic and cadmium before growing food here.
Check your specific parcel in Supai
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 Supai average
Your land is one point inside Supai
Everything above resolves to Supai as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Supai Average
Supai Average
- ●USDA Zones 8b, averaged across Supai
- ●One soil character for all of Supai
- ●Frost dates read at Supai's scale: Feb 28 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Supai's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Supai
Pull a site-specific report for your exact address in Supai, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Supai averages can't show:
We read public map data around Supai — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Supai average
How we know this about Supai
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 Supai’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 Supai
When does frost risk typically end in Supai?
The last hard freeze (28°F) in Supai typically lands around Feb 28, 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 21.
When is the first frost in Supai?
The first hard freeze (28°F) in Supai typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 265 days after the spring freeze cleared.
How long is the growing season in Supai?
Measured between 28°F hard freezes, Supai sees about 265 frost-free days — roughly Feb 28 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 21 to Nov 6, about 230 days.
Is the soil safe to grow vegetables in Supai?
The federal record around Supai shows 13 documented sites, mostly Nitrate entries (10), the nearest Nitrate record under a tenth of a mile out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Supai?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Supai's scale — its 8b band and its 265-day season. Your yard writes its own version of Supai'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 Supai’s own scale
6 of the readings below were taken at Supai's own scale — its own ~265-day season between 28°F freezes, the 1,102 acres it covers and 13 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Supai's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Supai's own 28°F hard-freeze dates, about Feb 28 and Nov 20 and the ~265-day span between themNOAA 1991–2020 Climate Normals
- 13 documented contamination sites on the federal record near Supai, the closest Nitrate record under a tenth of a mile out from the town centreFederal environmental registers
- Supai's boundary and the 1,102 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~265-day seasonGrowable Ground crop-matching engine
- The ecoregion at Supai's own centroid, the Arizona/New Mexico PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Supai's 1,102 acres read through its county's SSURGO summaryfrom Coconino County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Coconino 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 Coconino County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Supai's 1,102 acreswhy one lot differs from the next →
- Which side of Supai you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,102 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record under a tenth of a mile 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 Supai-wide figureread your own land →