Adair, Oklahoma, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Adair, 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 Adair 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 Adair — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Adair — the short answer
Adair, Oklahoma: USDA zone 7a, about 222 days between hard freezes, across 3K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~222
- 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 7a is Adair's average, not your lot's — a low corner or a tree line moves it. Against Adair's 222-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Adair
Each reading below is measured for Adair itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAdair runs about 222 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredAdair sits in USDA hardiness zone 7a.
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 Adair is in
Adair sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Adair's own centroid rather than borrowed from Mayes County.
What Grows in Adair
Every plant below cleared Adair's own zone 7a and its 222-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Adair?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 6 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Adair
Closest first, within ~10 miles of Adair. Listing isn't leaking, and distance isn't exposure.
- Casey's General Store #3429Underground Storage Tanks · 350 ft
- Debbie HamillUnderground Storage Tanks · 500 ft
- The Main StoreUnderground Storage Tanks · 600 ft
- WoodshedUnderground Storage Tanks · 800 ft
- Adair Public SchoolUnderground Storage Tanks · 1600 ft
- Mayes County District 1Underground Storage Tanks · 0.8 mi
- Larry's Convenience StoreUnderground Storage Tanks · 1.0 mi
- Mayes County Maintenance HdgUnderground Storage Tanks · 6.8 mi
- Big Cabin SchoolsUnderground Storage Tanks · 7.3 mi
- One Stop Food MartUnderground Storage Tanks · 7.6 mi
- Well Owner Name: SteveNitrate · 7.6 mi
- Mitchs # 2Underground Storage Tanks · 8.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Adair'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 Adair.
Total Sites
67
within ~10 miles of Adair
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Adair
Severity Distribution
within ~10 miles of Adair
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Adair, two things run higher than the national average within ~10 miles of Adair — PFAS (3 sites) and Underground Storage Tanks (47 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Adair
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 Adair average
Your land is one point inside Adair
Everything above resolves to Adair 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 Adair Average
Adair Average
- ●USDA Zones 7a, averaged across Adair
- ●One soil character for all of Adair
- ●Frost dates read at Adair's scale: Mar 29 to Nov 6
YOUR Parcel
- ✓Your exact zone, not Adair's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Adair
Pull a site-specific report for your exact address in Adair, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Adair averages can't show:
We read public map data around Adair — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Adair average
How we know this about Adair
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 Adair’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 Adair
When does frost risk typically end in Adair?
The last hard freeze (28°F) in Adair typically lands around Mar 29, 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 Apr 19.
When is the first frost in Adair?
The first hard freeze (28°F) in Adair typically arrives around Nov 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 23, so the watching starts about Oct 7 — about 222 days after the spring freeze cleared.
How long is the growing season in Adair?
Measured between 28°F hard freezes, Adair sees about 222 frost-free days — roughly Mar 29 through Nov 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 23, about 187 days.
Is the soil safe to grow vegetables in Adair?
The federal record around Adair is a meaningful one — 67 documented sites, mostly Underground Storage Tanks entries (47), the nearest Underground Storage Tanks record under a tenth of a mile 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 Adair?
From about Oct 7 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Adair's scale — its 7a band and its 222-day season. Your yard writes its own version of Adair'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 Adair’s own scale
6 of the readings below were taken at Adair's own scale — its own ~222-day season between 28°F freezes, the 3,146 acres it covers and 67 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Adair's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Adair's own 28°F hard-freeze dates, about Mar 29 and Nov 6 and the ~222-day span between themNOAA 1991–2020 Climate Normals
- 67 documented contamination sites on the federal record near Adair, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Adair's boundary and the 3,146 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~222-day seasonGrowable Ground crop-matching engine
- The ecoregion at Adair's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Adair's 3,146 acres read through its county's SSURGO summaryfrom Mayes County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Mayes County
- The growing challenges every Oklahoma grower plans around — written at state scale, so they stay on the state guidefrom Oklahoma
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Mayes County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Adair's 3,146 acreswhy one lot differs from the next →
- Which side of Adair you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,146 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Adair-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaAdair sits outside our named growing regions, so Oklahoma as a whole is its closest context here.
Nearby growing guides