The North Dakota Badlands spans USDA hardiness zones 4a-4b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
North Dakota's dry, wind-swept western half — the semi-arid side of the state's ~100th-meridian rainfall divide, where growers see roughly 6 to 8 inches less rain a year than the Red River Valley to the east. Zones run 4a-4b like much of the state, so the real work here isn't winter cold so much as drought: buttes-and-badlands terrain, hard prairie wind, and short-season dryland crops that need cover to hold moisture and finish before an early frost. On paper, sunflower, potato, rhubarb, and american elm all suit these conditions — on the ground, soil, sun, and drainage make the final call.
The North Dakota Badlands spans North Dakota.
Your yard isn't all of the North Dakota Badlands.
The North Dakota Badlands spans USDA zones 4a-4b, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 The North Dakota Badlands — soil, climate, flood, and parcel records. How we handle your address.
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The North Dakota Badlands — the short answer
The North Dakota Badlands: USDA zones 4a-4b, 148–152 frost-free days, in North Dakota.
- USDA zones
- 4a-4b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 148–152 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 8
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the North Dakota Badlands
Plants matched to the North Dakota Badlands' USDA zones 4a-4b, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the North Dakota Badlands
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the North Dakota Badlands’s USDA zones 4a-4b — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the North Dakota Badlands
The USDA soil survey maps this ground county by county. These are those records weighted by land area across eight member counties — this region’s own profile, not a state figure.
The ground is predominantly Mollisols, at 67% of mapped acres, followed by Entisols (25%), Inceptisols (6%) and Vertisols (1%). Five soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Cabba, Williams, and Cabbart.
76% of those acres are well drained, and another 10% moderately well drained, 4% somewhat excessively drained. Topsoil pH runs 6.5–7.9 between the lowest and the highest county on record. 2% of the footprint is classed prime farmland.
Soil order
Mollisols
Drainage
Well drained
Topsoil pH
6.5–7.9
Hydric soils
3%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Williams County holds the most wetland ground here, at 5% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the North Dakota Badlands
The soil survey reads this ground county by county, and the readings above are those records summed across the North Dakota Badlands. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records76% of the mapped acres across the North Dakota Badlands are well drained — ground that drains quickly. That is area-weighted across all eight of its mapped counties.
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
From county recordsTopsoil across the North Dakota Badlands runs pH 6.5–7.9 — near neutral in six of its eight counties.
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
Safe to Grow Here?
What the federal record shows across the North Dakota Badlands — and how to grow with it.
Across the North Dakota Badlands' 8 counties the federal record holds 3,073 documented sites, mostly Nitrate (2,314), Underground Storage Tanks (487) and Brownfields (194). The heaviest single county is Dunn County, with 737.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the North Dakota Badlands to see which records sit where you actually grow.
Sources Checked
Summed across the 8 counties in the North Dakota Badlands
A note from Gnorman
What an experienced grower watches for around here
In and around the North Dakota Badlands, Nitrate runs higher than the national average — 2,314 sites across the 8 counties in the North Dakota Badlands. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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).
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the North Dakota Badlands
Everything above resolves to the North Dakota Badlands as a whole — a footprint spanning USDA zones 4a-4b. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the North Dakota Badlands Average
North Dakota Badlands Average
- ●USDA Zones 4a-4b, averaged across North Dakota Badlands
- ●One soil character for all of North Dakota Badlands
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not North Dakota Badlands' 4a-4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the North Dakota Badlands
Pull a site-specific report for your exact address in the North Dakota Badlands — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that North Dakota Badlands averages can't show:
We read public map data around The North Dakota Badlands — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the North Dakota Badlands average
How we know this about the North Dakota Badlands
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the North Dakota Badlands
What hardiness zone is the North Dakota Badlands?
The North Dakota Badlands spans USDA hardiness zones 4a-4b, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the North Dakota Badlands?
Measured between 28°F hard freezes, the North Dakota Badlands' counties mostly run 150 to 151 frost-free days, median 151 (NOAA Regional Climate Centers ACIS, 1991–2020, over 8 member counties). That 1-day spread is the honest read — no single season describes 8 counties, and each county guide below carries its own.
When does frost risk end in the North Dakota Badlands?
Across the North Dakota Badlands, the middle half of member counties see their last 28°F hard freeze between May 6 and May 7 (median May 6), and their first fall freeze between Oct 4 and Oct 4. Those are hard freezes, not the last light frost: tender transplants wait for about May 27, and elevation decides which end of a 1-day spread you garden in.
What grows well in the North Dakota Badlands?
The North Dakota Badlands' conditions suit plants such as Sunflower, Potato, Rhubarb, American Elm. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the North Dakota Badlands defined?
The North Dakota Badlands is defined here as a curated cluster of 8 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the North Dakota Badlands cover?
The North Dakota Badlands spans North Dakota. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Red River Valley and Turtle Mountains share at least one state with the North Dakota Badlands. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the North Dakota Badlands’s own scale
6 of the readings below were taken at the North Dakota Badlands' own scale — the zone 4a-4b band across its footprint, a median 151-day season across its 8 counties and 3,073 documented federal contamination records across its 8 counties, 737 of them in Dunn County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 4a-4b aggregated across all 8 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 8 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 8 counties run 150 to 151 frost-free days, median 151NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 3,073 documented federal contamination records across its 8 counties, 737 of them in Dunn County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 67% Mollisols, topsoil pH 6.5–7.9, area-weighted across its 8 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 4a-4bfrom North Dakota
What this page can’t tell you
- Which end of the 1-day range your ground sits at — 150 days at one extreme, 151 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the North Dakota Badlands
State growing guides
Counties in this region
Other growing regions across North Dakota
The flat floor of glacial Lake Agassiz along the Red River of the North — deep, dark lakebed clays and one of the coldest, shortest northern seasons on the platform (USDA zones 3b-4b) behind classic sugar-beet, potato, and spring-wheat country.
The Turtle Mountains rise 300-400 feet above the surrounding drift prairie as a forested "island in a grassland sea" — an aspen-and-oak upland straddling the northern edges of Bottineau and Rolette counties that holds roughly 17% of North Dakota's native forest. That elevation, its lakes, and its cold-air pockets make it the coldest, shortest-season corner of the state: frost-free about 141 days at Bottineau and 145 at Rolette (both zone 3b), against a ~156-day North Dakota norm. Plan for a genuinely short, cool season here — it's the terrain, not the zone number, that sets this pocket apart from the rest of the northern border.