De Witt, Nebraska, 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, Nebraska: USDA zone 6a, about 198 days between hard freezes, across 273 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~198
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 273 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 198-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 198 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
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 Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at De Witt's own centroid rather than borrowed from Saline County.
What Grows in De Witt
Every plant below cleared De Witt's own zone 6a and its 198-day season. Each card opens that plant's Nebraska 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 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 23 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
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.
- IRWIN INDUSTRIAL TOOL COBrownfields · 1000 ft
- IRWIN INDUSTRIAL TOOL COToxics Release Inventory · 1000 ft
- 5N 4E14DDC 1Nitrate · 0.8 mi
- 5N 4E23CC 1Nitrate · 1.8 mi
- TRI COUNTY JR-SR HIGH SCHOOLBrownfields · 3.7 mi
- 6N 4E34CAC 1Nitrate · 3.9 mi
- 4N 4E 3AD 1Nitrate · 3.9 mi
- CASEYS GENERAL STORE #2718Underground Storage Tanks · 6.1 mi
- VETS SERVICEUnderground Storage Tanks · 6.1 mi
- MILLER LIVESTOCK INCUnderground Storage Tanks · 6.2 mi
- FARMERS COOPERATIVE - WILBERUnderground Storage Tanks · 6.2 mi
- SHOP QWIKUnderground Storage Tanks · 6.3 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
33
within ~10 miles of De Witt
Risk Level
Low
Highest-severity
4 Toxics Release Inventory facilities
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, two things run higher than the national average within ~10 miles of De Witt — Toxics Release Inventory (4 sites) and Nitrate (12 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
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 273 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 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 8 to Oct 23
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, Nebraska — 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 town’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 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 De Witt
When does frost risk typically end in De Witt?
The last hard freeze (28°F) in De Witt typically lands around Apr 8, 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 29.
When is the first frost in De Witt?
The first hard freeze (28°F) in De Witt typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 198 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 198 frost-free days — roughly Apr 8 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 9, about 163 days.
Is the soil safe to grow vegetables in De Witt?
The federal record around De Witt is light — 33 documented sites across the 9 federal source types we checked, mostly Nitrate entries (12), the nearest Brownfields record about 0.2 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in De Witt?
From about Sep 23 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 Oct 23 (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 Oct 23. 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 198-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 ~198-day season between 28°F freezes, the 273 acres it covers and 33 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 8 and Oct 23 and the ~198-day span between themNOAA 1991–2020 Climate Normals
- 33 documented contamination sites on the federal record near De Witt, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- De Witt's boundary and the 273 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~198-day seasonGrowable Ground crop-matching engine
- The ecoregion at De Witt's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so De Witt's 273 acres read through its county's SSURGO summaryfrom Saline County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Saline County
- The growing challenges every Nebraska grower plans around — written at state scale, so they stay on the state guidefrom Nebraska
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Saline 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 273 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 273 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Nebraska
Wider growing context
What grows across NebraskaDe Witt sits outside our named growing regions, so Nebraska as a whole is its closest context here.