Trenton, North Dakota, sits in USDA hardiness zone 4a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, turkish rocket, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Trenton, 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 Trenton 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 Trenton — soil, climate, flood, and parcel records. How we handle your address.
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Trenton — the short answer
Trenton, North Dakota: USDA zone 4a, about 158 days between hard freezes, across 670 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~158
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 670 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 4a is Trenton's average, not your lot's — a low corner or a tree line moves it. Against Trenton's 158-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Trenton
Each reading below is measured for Trenton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTrenton runs about 158 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
MeasuredTrenton 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 Trenton is in
Trenton sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Trenton's own centroid, and it is not what its county reads: Williams County is mostly Northwestern Glaciated Plains. The wider page above you is answering a different question about different ground.
What Grows in Trenton
Every plant below cleared Trenton's own zone 4a and its 158-day season. Each card opens that plant's North Dakota profile. How we score.
Is it too late to plant in Trenton?
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 Apr 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 5 — 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's on the federal record near Trenton
Closest first, within ~10 miles of Trenton. Listing isn't leaking, and distance isn't exposure.
- 153-102-17CCC2Nitrate · 750 ft
- 153-102-17CCC1Nitrate · 750 ft
- 1804 Country StoreUnderground Storage Tanks · 1000 ft
- 153-102-17CCA1Nitrate · 1100 ft
- 153-102-17CDBNitrate · 1800 ft
- Eight Mile School Dist 6Underground Storage Tanks · 2500 ft
- 153-102-17DCCNitrate · 0.6 mi
- 153-102-20ACNitrate · 0.9 mi
- 153-102-17DDC2Nitrate · 0.9 mi
- 153-102-20AABNitrate · 0.9 mi
- 152-103-01BBBNitrate · 3.4 mi
- 153-102-02CBB1Nitrate · 3.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Trenton'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 Trenton.
Total Sites
112
within ~10 miles of Trenton
Risk Level
Moderate
Highest-severity
8 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Trenton
Severity Distribution
within ~10 miles of Trenton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Trenton, two things run higher than the national average within ~10 miles of Trenton — Nitrate (62 sites) and Toxics Release Inventory (8 sites). 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.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Trenton
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 Trenton average
Your land is one point inside Trenton
Everything above resolves to Trenton as a whole — one PHZM band and one 28°F frost record, read across 670 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 Trenton Average
Trenton Average
- ●USDA Zones 4a, averaged across Trenton
- ●One soil character for all of Trenton
- ●Frost dates read at Trenton's scale: Apr 30 to Oct 5
YOUR Parcel
- ✓Your exact zone, not Trenton's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Trenton
Pull a site-specific report for your exact address in Trenton, North Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Trenton averages can't show:
We read public map data around Trenton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Trenton average
How we know this about Trenton
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 Trenton’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 Trenton
When does frost risk typically end in Trenton?
The last hard freeze (28°F) in Trenton typically lands around Apr 30, 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 21.
When is the first frost in Trenton?
The first hard freeze (28°F) in Trenton typically arrives around Oct 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 21, so the watching starts about Sep 5 — about 158 days after the spring freeze cleared.
How long is the growing season in Trenton?
Measured between 28°F hard freezes, Trenton sees about 158 frost-free days — roughly Apr 30 through Oct 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Sep 21, about 123 days.
Is the soil safe to grow vegetables in Trenton?
The federal record around Trenton shows 112 documented sites, mostly Nitrate entries (62), the nearest Nitrate record about 0.1 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.
How do I protect my plants from frost in Trenton?
From about Sep 5 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Trenton's scale — its 4a band and its 158-day season. Your yard writes its own version of Trenton'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 Trenton’s own scale
6 of the readings below were taken at Trenton's own scale — its own ~158-day season between 28°F freezes, the 670 acres it covers and 112 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Trenton's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Trenton's own 28°F hard-freeze dates, about Apr 30 and Oct 5 and the ~158-day span between themNOAA 1991–2020 Climate Normals
- 112 documented contamination sites on the federal record near Trenton, the closest Nitrate record about 0.1 miles out from the town centreFederal environmental registers
- Trenton's boundary and the 670 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~158-day seasonGrowable Ground crop-matching engine
- Trenton sits in the Northwestern Great Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Trenton's 670 acres read through its county's SSURGO summaryfrom Williams County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Williams County
- The growing challenges every North Dakota grower plans around — written at state scale, so they stay on the state guidefrom North Dakota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Williams County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Trenton's 670 acreswhy one lot differs from the next →
- Which side of Trenton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 670 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.1 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 Trenton-wide figureread your own land →