Billings County, in North Dakota, sits in USDA hardiness zone 4a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, cranberry, turkish rocket, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Billings County lies within the North Dakota Badlands — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Billings County holds more than one microclimate.
Soils and elevations shift across Billings 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 Billings County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Billings County — the short answer
Billings County, North Dakota: USDA zone 4a, about 151 days between hard freezes, across 735K acres.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 4
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~151
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 735K 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 4a is Billings County's average, not your lot's — a low corner or a tree line moves it. Against Billings County's 151-day season, see what your own ground reads.
Heat in Billings County
Across a year, Billings County accumulates about 1,960 growing degree days above 50°F, about 47 more than the middle North Dakota county — ahead of 38 of North Dakota’s 53 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 Billings County
Across Billings County, the ground is predominantly Mollisols, where Cabbart, Patent, and Janesburg are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 6.7–7.9, neutral. Rainfall drains through hydrologic group B soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
0%
Hydric soils
2%
Soil still varies lot by lot — soil types explained.
How the ground varies across Billings County
The USDA soil survey maps 78% of Billings County as well drained — but another 16% drains differently: 11% moderately well drained, 3% excessively drained.
Cabbart is the most extensive named soil at 12% of mapped acres, then Patent (11%) and Janesburg (8%).
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 Billings County
Each reading below is measured for Billings 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 Billings County are well drained, in hydrologic group B — 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 Billings County runs about pH 6.7–7.9, on the alkaline side.
Many vegetables cope, but acid-lovers like blueberries struggle, and iron and manganese lock up above about pH 7.5 — leaves yellow between the veins even in rich soil.
Elemental sulfur and generous organic matter lower pH slowly for the beds that need it; test first so you add only what the soil actually calls for.
USDA NRCS SSURGO
Season length
MeasuredBillings County runs about 151 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
MeasuredBillings County sits in USDA hardiness zone 4a.
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 Billings County is in
Billings County sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. One consistent ecological setting across the whole county.
What Grows in Billings County
We scored all 1,086 plants against Billings County's own USDA zone 4a and its own 151-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 North Dakota profile.
Is it too late to plant in Billings County?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Apr 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 4 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What gets applied to farmland in Billings County
USGS estimates 47,646 lb of Glyphosate on Billings County farmland in 2019, its largest by weight, ahead of 2,4-d (10,528 lb) and Bromoxynil (6,160 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 Billings County — and how to grow with it.
We checked the federal record across Billings County — 106 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 Billings 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 Billings County
Closest first, across Billings County. Listing isn't leaking, and distance isn't exposure.
- 141-100-30ACANitrate · 1.6 mi
- 141-100-34CBCNitrate · 1.7 mi
- 142-100-25DDANitrate · 6.4 mi
- MIKE AUNEY WELLNitrate · 6.5 mi
- JONES CREEK WELLNitrate · 6.5 mi
- 140-100-28CABNitrate · 7.0 mi
- VA WELLNitrate · 7.6 mi
- OLSON WELLNitrate · 7.6 mi
- EKBLOM WELLNitrate · 7.9 mi
- A T and T CommunicationsUnderground Storage Tanks · 8.3 mi
- PLAINS MARKETING - FRYBURG STATIONBrownfields · 9.4 mi
- Amerada Hess CorporationUnderground Storage Tanks · 9.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Billings 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 Billings County.
Total Sites
106
across Billings County
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
across Billings County
Severity Distribution
across Billings County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Billings County, Nitrate runs higher than the national average — 84 sites across Billings County. 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).
Check your specific parcel in Billings 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 Billings County average
Your land is one point inside Billings County
Everything above resolves to Billings County as a whole — one PHZM band and one county frost record, read across 735K 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 Billings County Average
Billings County Average
- ●USDA Zones 4a, averaged across Billings County
- ●One soil character for all of Billings County
- ●Frost dates read at Billings County's scale: May 6 to Oct 4
YOUR Parcel
- ✓Your exact zone, not Billings County's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Billings County
Pull a site-specific report for your exact address in Billings County, North Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Billings County averages can't show:
We read public map data around Billings County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Billings County average
How we know this about Billings 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 Billings County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Billings County
When does frost risk typically end in Billings County?
The last hard freeze (28°F) in Billings County typically lands around May 6, 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 27.
How long is the growing season in Billings County?
Measured between 28°F hard freezes, Billings County sees about 151 frost-free days — roughly May 6 through Oct 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 20, about 116 days.
Is the soil safe to grow vegetables in Billings County?
The federal record around Billings County shows 106 documented sites, mostly Nitrate entries (84), the nearest Nitrate record about 1.6 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 Billings County's scale — its 4a band and its 151-day season. Your yard writes its own version of Billings 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 North Dakota's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Billings County’s own scale
8 of the readings below were taken at Billings County's own scale — its own ~151-day span between 28°F freezes, the 3 most extensive soil series mapped here and 106 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Billings County's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Billings County's own 28°F hard-freeze dates and its ~151-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Billings CountyUSDA NRCS SSURGO
- 106 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 1.6 miles outFederal environmental registers
- Billings County's boundary and the 735,032 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~151-day seasonGrowable Ground crop-matching engine
- Billings County sitting wholly inside the Northwestern Great PlainsUS EPA Level III Ecoregions
- Which agricultural compounds go onto Billings County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every North Dakota grower plans around — written at state scale, so they stay on the state guidefrom North Dakota
What this page can’t tell you
- How the season shifts across Billings County — the ~151 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 Billings County's 735,032 acreswhy one lot differs from the next →
- Which of those 106 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 Billings Countyread your own land →