Sargent County, in North Dakota, sits in USDA hardiness zone 4a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Sargent County holds more than one microclimate.
Soils and elevations shift across Sargent 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 Sargent County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Sargent County — the short answer
Sargent County, North Dakota: USDA zone 4a, about 168 days between hard freezes, across 549K acres.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 25
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 10
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~168
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 549K 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 Sargent County's average, not your lot's — a low corner or a tree line moves it. Against Sargent County's 168-day season, see what your own ground reads.
Heat in Sargent County
Across a year, Sargent County accumulates about 2,201 growing degree days above 50°F, about 288 more than the middle North Dakota county — ahead of 51 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 Sargent County
Across Sargent County, the ground is predominantly Mollisols, where Forman, Aastad, and Parnell are the most extensive named soil series. The soil is generally moderately well drained with a loam surface. Topsoil pH runs about 7.0–7.2, neutral. Rainfall drains through hydrologic group C soils.
Soil order
Mollisols
Drainage
Moderately well drained
Prime farmland
37%
Hydric soils
19%
Soil still varies lot by lot — soil types explained.
How the ground varies across Sargent County
The USDA soil survey maps 39% of Sargent County as moderately well drained — but another 60% drains differently: 34% well drained, 12% somewhat poorly drained.
Forman is the most extensive named soil at 23% of mapped acres, then Aastad (20%) and Parnell (7%).
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 Sargent County
Each reading below is measured for Sargent 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 Sargent County are moderately well drained, in hydrologic group C — roughly the middle of the drainage range.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Sargent County runs about pH 7.0–7.2, 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
Wet ground
MeasuredAbout 19% of Sargent County is mapped as hydric — wetland — soil.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Season length
MeasuredSargent 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
The kind of country Sargent County is in
Sargent County spans 2 EPA Level III ecoregions — Northern Glaciated Plains (93%) and Lake Agassiz Plain (7%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Sargent County
We scored all 1,086 plants against Sargent County's own USDA zone 4a 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 North Dakota profile.
Is it too late to plant in Sargent County?
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 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 10 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What gets applied to farmland in Sargent County
USGS estimates 235,909 lb of Glyphosate on Sargent County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (98,780 lb) and Metolachlor-s (79,570 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 Sargent County — and how to grow with it.
We checked the federal record across Sargent County — 517 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.
There's a meaningful federal record across Sargent County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Sargent County
Closest first, across Sargent County. Listing isn't leaking, and distance isn't exposure.
- Forman Alt Parts and ServiceUnderground Storage Tanks · 1200 ft
- Seaverts Auto ServiceUnderground Storage Tanks · 1300 ft
- Jims Oil and ServiceUnderground Storage Tanks · 1500 ft
- Dakota Precision Fabricating IncUnderground Storage Tanks · 1800 ft
- 130-055-06ABBNitrate · 1900 ft
- 130-056-01AAB1Nitrate · 2000 ft
- Sargent CentralUnderground Storage Tanks · 0.6 mi
- Sargent County Highway Department-ShopUnderground Storage Tanks · 0.9 mi
- North Dakota State Dept of TransportationUnderground Storage Tanks · 1.0 mi
- 131-055-29CCCNitrate · 1.5 mi
- 130-055-04BBBNitrate · 1.9 mi
- 130-056-02BBBNitrate · 2.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sargent 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 Sargent County.
Total Sites
517
across Sargent County
Risk Level
Elevated
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
across Sargent County
Severity Distribution
across Sargent County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sargent County, Nitrate runs higher than the national average — 486 sites across Sargent 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 Sargent 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 Sargent County average
Your land is one point inside Sargent County
Everything above resolves to Sargent County as a whole — one PHZM band and one county frost record, read across 549K 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 Sargent County Average
Sargent County Average
- ●USDA Zones 4a, averaged across Sargent County
- ●One soil character for all of Sargent County
- ●Frost dates read at Sargent County's scale: Apr 25 to Oct 10
YOUR Parcel
- ✓Your exact zone, not Sargent County's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Sargent County
Pull a site-specific report for your exact address in Sargent County, North Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sargent County averages can't show:
We read public map data around Sargent County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sargent County average
How we know this about Sargent 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 Sargent County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Sargent County
When does frost risk typically end in Sargent County?
The last hard freeze (28°F) in Sargent County typically lands around Apr 25, 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 16.
How long is the growing season in Sargent County?
Measured between 28°F hard freezes, Sargent County sees about 168 frost-free days — roughly Apr 25 through Oct 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 16 to Sep 26, about 133 days.
Is the soil safe to grow vegetables in Sargent County?
The federal record around Sargent County is a meaningful one — 517 documented sites, mostly Nitrate entries (486), the nearest Underground Storage Tanks record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
Everything above is measured at Sargent County's scale — its 4a band and its 168-day season. Your yard writes its own version of Sargent 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 Sargent County’s own scale
8 of the readings below were taken at Sargent County's own scale — its own ~168-day span between 28°F freezes, the 3 most extensive soil series mapped here and 517 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Sargent County's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Sargent 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 Sargent CountyUSDA NRCS SSURGO
- 517 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record about 0.2 miles outFederal environmental registers
- Sargent County's boundary and the 549,433 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~168-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Sargent County spans, Northern Glaciated Plains the largestUS EPA Level III Ecoregions
- Which agricultural compounds go onto Sargent 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 Sargent 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 Sargent County's 549,433 acreswhy one lot differs from the next →
- Which of those 517 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 Sargent Countyread your own land →