Thomas, Oklahoma, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, prickly pear, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Thomas, 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 Thomas 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 Thomas — soil, climate, flood, and parcel records. How we handle your address.
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Thomas — the short answer
Thomas, Oklahoma: USDA zone 7b, about 232 days between hard freezes, across 910 acres of city.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~232
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 910 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 7b is Thomas's average, not your lot's — a low corner or a tree line moves it. Against Thomas's 232-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Thomas
Each reading below is measured for Thomas itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredThomas runs about 232 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
MeasuredThomas sits in USDA hardiness zone 7b.
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 Thomas is in
Thomas sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Thomas's own centroid rather than borrowed from Custer County.
What Grows in Thomas
Every plant below cleared Thomas's own zone 7b and its 232-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Thomas?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Thomas
Closest first, within ~10 miles of Thomas. Listing isn't leaking, and distance isn't exposure.
- Thomas Nursing CenterUnderground Storage Tanks · 700 ft
- Mercer's 66Underground Storage Tanks · 1300 ft
- Sooner Easy ShopUnderground Storage Tanks · 1500 ft
- ASAP General Stores #302Underground Storage Tanks · 1700 ft
- Ames & Pickens Oil Co.Underground Storage Tanks · 1700 ft
- Dx StationUnderground Storage Tanks · 1900 ft
- Miller's Gas & GrubUnderground Storage Tanks · 2200 ft
- Ross McneilUnderground Storage Tanks · 2200 ft
- Ames & Pickens Key PumpsUnderground Storage Tanks · 2200 ft
- South Canadian CoopUnderground Storage Tanks · 2300 ft
- 15N-14W-31 BAA 1Nitrate · 0.6 mi
- Jim ChristensenUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Thomas'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 Thomas.
Total Sites
70
within ~10 miles of Thomas
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Thomas
Severity Distribution
within ~10 miles of Thomas
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Thomas, Nitrate runs higher than the national average — 24 sites within ~10 miles of Thomas. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Thomas
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 Thomas average
Your land is one point inside Thomas
Everything above resolves to Thomas as a whole — one PHZM band and one 28°F frost record, read across 910 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 Thomas Average
Thomas Average
- ●USDA Zones 7b, averaged across Thomas
- ●One soil character for all of Thomas
- ●Frost dates read at Thomas's scale: Mar 24 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Thomas's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Thomas
Pull a site-specific report for your exact address in Thomas, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Thomas averages can't show:
We read public map data around Thomas — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Thomas average
How we know this about Thomas
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 Thomas’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 Thomas
When does frost risk typically end in Thomas?
The last hard freeze (28°F) in Thomas typically lands around Mar 24, 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 14.
When is the first frost in Thomas?
The first hard freeze (28°F) in Thomas typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 232 days after the spring freeze cleared.
How long is the growing season in Thomas?
Measured between 28°F hard freezes, Thomas sees about 232 frost-free days — roughly Mar 24 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 14 to Oct 28, about 197 days.
Is the soil safe to grow vegetables in Thomas?
The federal record around Thomas shows 70 documented sites, mostly Underground Storage Tanks entries (40), 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 Thomas?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Thomas's scale — its 7b band and its 232-day season. Your yard writes its own version of Thomas'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 Thomas’s own scale
6 of the readings below were taken at Thomas's own scale — its own ~232-day season between 28°F freezes, the 910 acres it covers and 70 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Thomas's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Thomas's own 28°F hard-freeze dates, about Mar 24 and Nov 11 and the ~232-day span between themNOAA 1991–2020 Climate Normals
- 70 documented contamination sites on the federal record near Thomas, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Thomas's boundary and the 910 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~232-day seasonGrowable Ground crop-matching engine
- The ecoregion at Thomas's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Thomas's 910 acres read through its county's SSURGO summaryfrom Custer County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Custer 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 Custer County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Thomas's 910 acreswhy one lot differs from the next →
- Which side of Thomas you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 910 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 Thomas-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaThomas sits outside our named growing regions, so Oklahoma as a whole is its closest context here.
Nearby growing guides