Iantha, Missouri, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, cabbage, hazelnut, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Iantha, 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 Iantha 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 Iantha — soil, climate, flood, and parcel records. How we handle your address.
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Iantha — the short answer
Iantha, Missouri: USDA zone 7a, about 226 days between hard freezes, across 173 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~226
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 173 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 Iantha's average, not your lot's — a low corner or a tree line moves it. Against Iantha's 226-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Iantha
Each reading below is measured for Iantha itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredIantha runs about 226 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
MeasuredIantha 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 Iantha is in
Iantha sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Iantha's own centroid rather than borrowed from Barton County.
What Grows in Iantha
Every plant below cleared Iantha's own zone 7a and its 226-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Iantha?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 8 — 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 Iantha
Closest first, within ~10 miles of Iantha. Listing isn't leaking, and distance isn't exposure.
- T32N R31W 17AAA1Nitrate · 2.6 mi
- T32N R31W 29DBD1Nitrate · 3.1 mi
- T32N R31W 28CAC1Nitrate · 3.2 mi
- BARNES APPLIANCEUnderground Storage Tanks · 4.3 mi
- T32N R32W 33CCC1Nitrate · 4.3 mi
- FIRST CLASS SWINECAFO · 4.6 mi
- LIBERAL MAINT LOTUnderground Storage Tanks · 4.6 mi
- Unknown - Pb.& Zn.Mining · 4.7 mi
- BARTON COUNTY ELEC COOPERATIVE, INCUnderground Storage Tanks · 4.8 mi
- CITY OF LAMAR AIRPORTUnderground Storage Tanks · 5.0 mi
- T32N R31W 26BDDNitrate · 5.1 mi
- COX BARTON COUNTY HOSPITAL DBA COXHELATHBrownfields · 5.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Iantha'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 Iantha.
Total Sites
69
within ~10 miles of Iantha
Risk Level
Elevated
Highest-severity
5 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Iantha
Severity Distribution
within ~10 miles of Iantha
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Iantha, two things run higher than the national average within ~10 miles of Iantha — Nitrate (22 sites) and Toxics Release Inventory (5 sites). That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Iantha
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 Iantha average
Your land is one point inside Iantha
Everything above resolves to Iantha as a whole — one PHZM band and one 28°F frost record, read across 173 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 Iantha Average
Iantha Average
- ●USDA Zones 7a, averaged across Iantha
- ●One soil character for all of Iantha
- ●Frost dates read at Iantha's scale: Mar 27 to Nov 8
YOUR Parcel
- ✓Your exact zone, not Iantha's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Iantha
Pull a site-specific report for your exact address in Iantha, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Iantha averages can't show:
We read public map data around Iantha — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Iantha average
How we know this about Iantha
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 Iantha’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 Iantha
When does frost risk typically end in Iantha?
The last hard freeze (28°F) in Iantha typically lands around Mar 27, 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 17.
When is the first frost in Iantha?
The first hard freeze (28°F) in Iantha typically arrives around Nov 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 25, so the watching starts about Oct 9 — about 226 days after the spring freeze cleared.
How long is the growing season in Iantha?
Measured between 28°F hard freezes, Iantha sees about 226 frost-free days — roughly Mar 27 through Nov 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 25, about 191 days.
Is the soil safe to grow vegetables in Iantha?
The federal record around Iantha is a meaningful one — 69 documented sites, mostly Underground Storage Tanks entries (29), the nearest Nitrate record about 2.6 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 Iantha?
From about Oct 9 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Iantha's scale — its 7a band and its 226-day season. Your yard writes its own version of Iantha'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 Iantha’s own scale
6 of the readings below were taken at Iantha's own scale — its own ~226-day season between 28°F freezes, the 173 acres it covers and 69 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Iantha's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Iantha's own 28°F hard-freeze dates, about Mar 27 and Nov 8 and the ~226-day span between themNOAA 1991–2020 Climate Normals
- 69 documented contamination sites on the federal record near Iantha, the closest Nitrate record about 2.6 miles out from the town centreFederal environmental registers
- Iantha's boundary and the 173 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~226-day seasonGrowable Ground crop-matching engine
- The ecoregion at Iantha's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Iantha's 173 acres read through its county's SSURGO summaryfrom Barton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Barton County
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Barton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Iantha's 173 acreswhy one lot differs from the next →
- Which side of Iantha you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 173 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 2.6 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 Iantha-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriIantha sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides