De Witt, Missouri, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in De Witt, 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 De Witt 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 De Witt — soil, climate, flood, and parcel records. How we handle your address.
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De Witt — the short answer
De Witt, Missouri: USDA zone 6a, about 214 days between hard freezes, across 154 acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~214
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 154 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 6a is De Witt's average, not your lot's — a low corner or a tree line moves it. Against De Witt's 214-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in De Witt
Each reading below is measured for De Witt itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDe Witt runs about 214 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
MeasuredDe Witt sits in USDA hardiness zone 6a.
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 De Witt is in
De Witt sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at De Witt's own centroid, and it is not what its county reads: Carroll County is mostly Central Irregular Plains. The wider page above you is answering a different question about different ground.
What Grows in De Witt
Every plant below cleared De Witt's own zone 6a and its 214-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in De Witt?
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 Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — 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 De Witt
Closest first, within ~10 miles of De Witt. Listing isn't leaking, and distance isn't exposure.
- T53N R21W 24CDNitrate · 1000 ft
- T53N R21W 24DBB1Nitrate · 1900 ft
- T53N R21W 20CBB1Nitrate · 1.9 mi
- T52N R21W 03AAA1Nitrate · 2.3 mi
- T53N R21W 32ABC1Nitrate · 3.6 mi
- T52N R21W 05BDNitrate · 4.3 mi
- VANMETER-TETESEAU LEVEE DISTUnderground Storage Tanks · 4.5 mi
- T53N R21W 30CBD1Nitrate · 4.8 mi
- KCPL-BRUNSWICK SERVICE CENTERUnderground Storage Tanks · 5.1 mi
- BRUNSWICK R-II ELEMENTARYUnderground Storage Tanks · 5.2 mi
- T53N R20W 10DAA1Nitrate · 5.4 mi
- RON'S 66 SERVICEUnderground Storage Tanks · 5.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from De Witt'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 De Witt.
Total Sites
60
within ~10 miles of De Witt
Risk Level
Moderate
Highest-severity
2 concentrated animal feeding operations
Sources Checked
within ~10 miles of De Witt
Severity Distribution
within ~10 miles of De Witt
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around De Witt, Nitrate runs higher than the national average — 42 sites within ~10 miles of De Witt. 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 De Witt
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 De Witt average
Your land is one point inside De Witt
Everything above resolves to De Witt as a whole — one PHZM band and one 28°F frost record, read across 154 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 De Witt Average
De Witt Average
- ●USDA Zones 6a, averaged across De Witt
- ●One soil character for all of De Witt
- ●Frost dates read at De Witt's scale: Apr 1 to Nov 1
YOUR Parcel
- ✓Your exact zone, not De Witt's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in De Witt
Pull a site-specific report for your exact address in De Witt, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that De Witt averages can't show:
We read public map data around De Witt — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the De Witt average
How we know this about De Witt
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 De Witt’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 De Witt
When does frost risk typically end in De Witt?
The last hard freeze (28°F) in De Witt typically lands around Apr 1, 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 22.
When is the first frost in De Witt?
The first hard freeze (28°F) in De Witt typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 214 days after the spring freeze cleared.
How long is the growing season in De Witt?
Measured between 28°F hard freezes, De Witt sees about 214 frost-free days — roughly Apr 1 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 18, about 179 days.
Is the soil safe to grow vegetables in De Witt?
The federal record around De Witt shows 60 documented sites, mostly Nitrate entries (42), the nearest Nitrate record about 0.2 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 De Witt?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at De Witt's scale — its 6a band and its 214-day season. Your yard writes its own version of De Witt'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 De Witt’s own scale
6 of the readings below were taken at De Witt's own scale — its own ~214-day season between 28°F freezes, the 154 acres it covers and 60 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- De Witt's own USDA hardiness band, zones 6aUSDA PHZM 2023
- De Witt's own 28°F hard-freeze dates, about Apr 1 and Nov 1 and the ~214-day span between themNOAA 1991–2020 Climate Normals
- 60 documented contamination sites on the federal record near De Witt, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- De Witt's boundary and the 154 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~214-day seasonGrowable Ground crop-matching engine
- De Witt sits in the Western Corn Belt Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so De Witt's 154 acres read through its county's SSURGO summaryfrom Carroll County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Carroll 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 Carroll County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among De Witt's 154 acreswhy one lot differs from the next →
- Which side of De Witt you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 154 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 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 De Witt-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriDe Witt sits outside our named growing regions, so Missouri as a whole is its closest context here.