Deuel County, in South Dakota, sits in USDA hardiness zone 4b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, cranberry, turkish rocket, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Deuel County lies within the Coteau des Prairies / Glacial Lakes (Northeastern SD) — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Deuel County holds more than one microclimate.
Soils and elevations shift across Deuel County, so your frost dates and drainage aren't the county average. 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 Deuel County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Deuel County — the short answer
Deuel County, South Dakota: USDA zone 4b, about 168 days between hard freezes, across 399K acres.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 26
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 11
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~168
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 399K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 4b is Deuel County's average, not your lot's — a low corner or a tree line moves it. Against Deuel County's 168-day season, see what your own ground reads.
Heat in Deuel County
Across a year, Deuel County accumulates about 2,101 growing degree days above 50°F, about 325 fewer than the middle South Dakota county — ahead of 4 of South Dakota’s 66 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Deuel County
Across Deuel County, the ground is predominantly Mollisols, where Barnes, Kranzburg, and Buse are the most extensive named soil series. The soil is generally well drained with a loam surface. Topsoil pH runs about 6.7–7.3, neutral. Rainfall drains through hydrologic group C soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
51%
Hydric soils
14%
Soil still varies lot by lot — soil types explained.
How the ground varies across Deuel County
The USDA soil survey maps 71% of Deuel County as well drained — but another 27% drains differently: 7% somewhat poorly drained, 7% very poorly drained.
Barnes is the most extensive named soil at 14% of mapped acres, then Kranzburg (10%) and Buse (9%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Deuel County
Each reading below is measured for Deuel County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Deuel County are well drained, in hydrologic group C — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Deuel County runs about pH 6.7–7.3, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredDeuel County runs about 168 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
MeasuredDeuel County sits in USDA hardiness zone 4b.
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 Deuel County is in
Deuel County sits in the Northern Glaciated Plains — EPA Level III, inside the wider Great Plains. One consistent ecological setting across the whole county.
What Grows in Deuel County
We scored all 1,086 plants against Deuel County's own USDA zone 4b and its own 168-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's South Dakota profile.
Is it too late to plant in Deuel County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 29; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 11 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Deuel County
- monarch butterfly4 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Deuel County
USGS estimates 120,241 lb of Glyphosate on Deuel County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (43,372 lb) and Metolachlor-s (40,288 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Deuel County — and how to grow with it.
We checked the federal record across Deuel County — 118 documented sites across 4 of the 9 source types we track.
The most significant on record: 2 Toxics Release Inventory facilities. Active industrial facilities reporting chemical releases to air, water, and land.
The federal record across Deuel County is a modest one — a typical footprint for a growing area. Nothing here calls for alarm; it's worth knowing which recorded sites sit closest to where you grow, and each one on the map carries its type and location. If one turns out to be a near neighbor, a one-time soil test settles the question.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Deuel County
Closest first, across Deuel County. Listing isn't leaking, and distance isn't exposure.
- MIDWEST E RECYCLINGBrownfields · 1700 ft
- DEUEL COUNTY C-STOREUnderground Storage Tanks · 2100 ft
- FORMER MEL'S AUTOUnderground Storage Tanks · 2100 ft
- FORMER MILLER INSURANCEUnderground Storage Tanks · 2100 ft
- COWBOY COUNTRY STOREUnderground Storage Tanks · 2100 ft
- SUPREME WELDING, INC.Brownfields · 2200 ft
- BUCK'S AMOCOUnderground Storage Tanks · 2300 ft
- DEUEL COUNTY MEMORIAL HOSPITALUnderground Storage Tanks · 2600 ft
- DEUEL SCHOOL DISTRICT 19-4Brownfields · 0.6 mi
- SD DEPT OF TRANSPORTATIONUnderground Storage Tanks · 0.7 mi
- 115N49W23ACCCNitrate · 0.7 mi
- FRITZ CHEVROLET, INC.Brownfields · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Deuel County'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 Deuel County.
Total Sites
118
across Deuel County
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
across Deuel County
Severity Distribution
across Deuel County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Deuel County, Nitrate runs higher than the national average — 82 sites across Deuel County. 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 Deuel County
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 Deuel County average
Your land is one point inside Deuel County
Everything above resolves to Deuel County as a whole — one PHZM band and one county frost record, read across 399K 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 county 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 county average.
Your Lot vs the Deuel County Average
Deuel County Average
- ●USDA Zones 4b, averaged across Deuel County
- ●One soil character for all of Deuel County
- ●Frost dates read at Deuel County's scale: Apr 26 to Oct 11
YOUR Parcel
- ✓Your exact zone, not Deuel County's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Deuel County
Pull a site-specific report for your exact address in Deuel County, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Deuel County averages can't show:
We read public map data around Deuel County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Deuel County average
How we know this about Deuel County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Deuel County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Deuel County
When does frost risk typically end in Deuel County?
The last hard freeze (28°F) in Deuel County typically lands around Apr 26, 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 May 17.
How long is the growing season in Deuel County?
Measured between 28°F hard freezes, Deuel County sees about 168 frost-free days — roughly Apr 26 through Oct 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 17 to Sep 27, about 133 days.
Is the soil safe to grow vegetables in Deuel County?
The federal record around Deuel County shows 118 documented sites, mostly Nitrate entries (82), the nearest Brownfields record about 0.3 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.
Everything above is measured at Deuel County's scale — its 4b band and its 168-day season. Your yard writes its own version of Deuel County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads South Dakota's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Deuel County’s own scale
9 of the readings below were taken at Deuel County's own scale — its own ~168-day span between 28°F freezes, the 3 most extensive soil series mapped here and 118 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Deuel County's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Deuel County's own 28°F hard-freeze dates and its ~168-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Deuel CountyUSDA NRCS SSURGO
- 118 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 0.3 miles outFederal environmental registers
- Deuel County's boundary and the 398,552 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~168-day seasonGrowable Ground crop-matching engine
- Deuel County sitting wholly inside the Northern Glaciated PlainsUS EPA Level III Ecoregions
- Open occurrence records documented in Deuel County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Deuel County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every South Dakota grower plans around — written at state scale, so they stay on the state guidefrom South Dakota
What this page can’t tell you
- How the season shifts across Deuel County — the ~168 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Deuel County's 398,552 acreswhy one lot differs from the next →
- Which of those 118 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Deuel Countyread your own land →