Healdton, Oklahoma, sits in USDA hardiness zone 8a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 Healdton, 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 Healdton 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 Healdton — soil, climate, flood, and parcel records. How we handle your address.
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Healdton — the short answer
Healdton, Oklahoma: USDA zone 8a, about 241 days between hard freezes, across 10K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~241
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 10K 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 8a is Healdton's average, not your lot's — a low corner or a tree line moves it. Against Healdton's 241-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Healdton
Each reading below is measured for Healdton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHealdton runs about 241 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
MeasuredHealdton sits in USDA hardiness zone 8a.
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 Healdton is in
Healdton sits in the Cross Timbers — EPA Level III, inside the wider Great Plains. That is read at Healdton's own centroid rather than borrowed from Carter County.
What Grows in Healdton
Every plant below cleared Healdton's own zone 8a and its 241-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Healdton?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 15 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Healdton
Closest first, within ~10 miles of Healdton. Listing isn't leaking, and distance isn't exposure.
- Healdton Full ServeUnderground Storage Tanks · 550 ft
- Mom's Minit Mart Inc.Underground Storage Tanks · 650 ft
- Healdton Oil Co IncUnderground Storage Tanks · 750 ft
- Mrs Joe TayarUnderground Storage Tanks · 950 ft
- Oklahoma National Guard ArmoryUnderground Storage Tanks · 1000 ft
- Pizza ExpressUnderground Storage Tanks · 1000 ft
- 04S-03W-11 1Nitrate · 1300 ft
- Healdton District Svr CenterUnderground Storage Tanks · 1600 ft
- Covey's TexacoUnderground Storage Tanks · 1700 ft
- ProMart #7Underground Storage Tanks · 1900 ft
- Healdton SchoolUnderground Storage Tanks · 1900 ft
- FAMILY DOLLAR # 7388Brownfields · 2000 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Healdton'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 Healdton.
Total Sites
92
within ~10 miles of Healdton
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Healdton
Severity Distribution
within ~10 miles of Healdton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Healdton, Underground Storage Tanks runs higher than the national average — 72 sites within ~10 miles of Healdton. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Healdton
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 Healdton average
Your land is one point inside Healdton
Everything above resolves to Healdton as a whole — one PHZM band and one 28°F frost record, read across 10K 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 city 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 Healdton Average
Healdton Average
- ●USDA Zones 8a, averaged across Healdton
- ●One soil character for all of Healdton
- ●Frost dates read at Healdton's scale: Mar 19 to Nov 15
YOUR Parcel
- ✓Your exact zone, not Healdton's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Healdton
Pull a site-specific report for your exact address in Healdton, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Healdton averages can't show:
We read public map data around Healdton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Healdton average
How we know this about Healdton
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Healdton’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 city grain anywhere on this page — there is no city-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 Healdton
When does frost risk typically end in Healdton?
The last hard freeze (28°F) in Healdton typically lands around Mar 19, 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 9.
When is the first frost in Healdton?
The first hard freeze (28°F) in Healdton typically arrives around Nov 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 1, so the watching starts about Oct 16 — about 241 days after the spring freeze cleared.
How long is the growing season in Healdton?
Measured between 28°F hard freezes, Healdton sees about 241 frost-free days — roughly Mar 19 through Nov 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Nov 1, about 206 days.
Is the soil safe to grow vegetables in Healdton?
The federal record around Healdton shows 92 documented sites, mostly Underground Storage Tanks entries (72), the nearest Underground Storage Tanks record about 0.1 miles 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 Healdton?
From about Oct 16 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 15 (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 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Healdton's scale — its 8a band and its 241-day season. Your yard writes its own version of Healdton'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 Healdton’s own scale
6 of the readings below were taken at Healdton's own scale — its own ~241-day season between 28°F freezes, the 10,281 acres it covers and 92 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Healdton's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Healdton's own 28°F hard-freeze dates, about Mar 19 and Nov 15 and the ~241-day span between themNOAA 1991–2020 Climate Normals
- 92 documented contamination sites on the federal record near Healdton, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Healdton's boundary and the 10,281 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~241-day seasonGrowable Ground crop-matching engine
- The ecoregion at Healdton's own centroid, the Cross TimbersUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Healdton's 10,281 acres read through its county's SSURGO summaryfrom Carter County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Carter 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 Carter County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Healdton's 10,281 acreswhy one lot differs from the next →
- Which side of Healdton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,281 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Healdton-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaHealdton sits outside our named growing regions, so Oklahoma as a whole is its closest context here.