Iron Post, Oklahoma, sits in USDA hardiness zone 7b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, prickly pear, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Iron Post, 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 Iron Post 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 Iron Post — soil, climate, flood, and parcel records. How we handle your address.
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Iron Post — the short answer
Iron Post, Oklahoma: USDA zone 7b, about 233 days between hard freezes, across 2K acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~233
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Iron Post's average, not your lot's — a low corner or a tree line moves it. Against Iron Post's 233-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Iron Post
Each reading below is measured for Iron Post itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredIron Post runs about 233 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
MeasuredIron Post 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 Iron Post is in
Iron Post sits in the Ozark Highlands — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Iron Post's own centroid, and it is not what its county reads: Mayes County is mostly Central Irregular Plains. The wider page above you is answering a different question about different ground.
What Grows in Iron Post
Every plant below cleared Iron Post's own zone 7b and its 233-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Iron Post?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Iron Post
Closest first, within ~10 miles of Iron Post. Listing isn't leaking, and distance isn't exposure.
- Spring Creek Country StoreUnderground Storage Tanks · 1.5 mi
- JER-CO INDUSTRIES INCToxics Release Inventory · 2.6 mi
- Former Kum & Go #846Underground Storage Tanks · 2.7 mi
- Kum & Go #846Underground Storage Tanks · 2.7 mi
- Wal-Mart Neighborhood Market #3723Underground Storage Tanks · 3.2 mi
- FAMILY DOLLAR #6545Brownfields · 3.2 mi
- Rowland Phillips 66Underground Storage Tanks · 3.3 mi
- WALMART NEIGHBORHOOD MARKET #3723Brownfields · 3.3 mi
- Pirate's Git N SplitUnderground Storage Tanks · 3.3 mi
- Willard's Day & NightUnderground Storage Tanks · 3.4 mi
- EXPRESS METAL FABRICATORS INCToxics Release Inventory · 3.4 mi
- Corner GroceryUnderground Storage Tanks · 3.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Iron Post'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 Iron Post.
Total Sites
84
within ~10 miles of Iron Post
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Iron Post
Severity Distribution
within ~10 miles of Iron Post
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Iron Post, Toxics Release Inventory runs higher than the national average — 17 sites within ~10 miles of Iron Post. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Iron Post
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 Iron Post average
Your land is one point inside Iron Post
Everything above resolves to Iron Post as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Iron Post Average
Iron Post Average
- ●USDA Zones 7b, averaged across Iron Post
- ●One soil character for all of Iron Post
- ●Frost dates read at Iron Post's scale: Mar 22 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Iron Post's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Iron Post
Pull a site-specific report for your exact address in Iron Post, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Iron Post averages can't show:
We read public map data around Iron Post — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Iron Post average
How we know this about Iron Post
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 Iron Post’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 Iron Post
When does frost risk typically end in Iron Post?
The last hard freeze (28°F) in Iron Post typically lands around Mar 22, 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 12.
When is the first frost in Iron Post?
The first hard freeze (28°F) in Iron Post typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 233 days after the spring freeze cleared.
How long is the growing season in Iron Post?
Measured between 28°F hard freezes, Iron Post sees about 233 frost-free days — roughly Mar 22 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 12 to Oct 27, about 198 days.
Is the soil safe to grow vegetables in Iron Post?
The federal record around Iron Post is a meaningful one — 84 documented sites, mostly Underground Storage Tanks entries (40), the nearest Underground Storage Tanks record about 1.5 miles 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 Iron Post?
From about Oct 11 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Iron Post's scale — its 7b band and its 233-day season. Your yard writes its own version of Iron Post'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 Iron Post’s own scale
6 of the readings below were taken at Iron Post's own scale — its own ~233-day season between 28°F freezes, the 1,710 acres it covers and 84 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Iron Post's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Iron Post's own 28°F hard-freeze dates, about Mar 22 and Nov 10 and the ~233-day span between themNOAA 1991–2020 Climate Normals
- 84 documented contamination sites on the federal record near Iron Post, the closest Underground Storage Tanks record about 1.5 miles out from the town centreFederal environmental registers
- Iron Post's boundary and the 1,710 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~233-day seasonGrowable Ground crop-matching engine
- Iron Post sits in the Ozark Highlands — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Iron Post's 1,710 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 Iron Post's 1,710 acreswhy one lot differs from the next →
- Which side of Iron Post you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,710 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 1.5 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 Iron Post-wide figureread your own land →
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