Roseau, Minnesota, sits in USDA hardiness zone 3b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Among the crops suited to this profile: cabbage, cranberry, turkish rocket, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Roseau, 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 Roseau 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 Roseau — soil, climate, flood, and parcel records. How we handle your address.
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Roseau — the short answer
Roseau, Minnesota: USDA zone 3b, about 152 days between hard freezes, across 2K acres of city.
- USDA zone
- 3b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- 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
- ~152
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 3b is Roseau's average, not your lot's — a low corner or a tree line moves it. Against Roseau's 152-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Roseau
Each reading below is measured for Roseau itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRoseau runs about 152 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
MeasuredRoseau sits in USDA hardiness zone 3b.
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 Roseau is in
Roseau sits in the Lake Agassiz Plain — EPA Level III, inside the wider Great Plains. That is read at Roseau's own centroid, and it is not what its county reads: Roseau County is mostly Northern Minnesota Wetlands. The wider page above you is answering a different question about different ground.
What Grows in Roseau
Every plant below cleared Roseau's own zone 3b and its 152-day season. Each card opens that plant's Minnesota profile. How we score.
Is it too late to plant in Roseau?
Almost never — the real question is what to plant next. 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 5 — 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.
What's on the federal record near Roseau
Closest first, within ~10 miles of Roseau. Listing isn't leaking, and distance isn't exposure.
- Farmers Union Oil CoUnderground Storage Tanks · 250 ft
- Cenex Land O Lakes Ag CenterUnderground Storage Tanks · 650 ft
- KUSTOM PAINT SHOP INCBrownfields · 750 ft
- ROSEAU POLICE DEPTBrownfields · 950 ft
- Roseau Truck Station/Old ShopUnderground Storage Tanks · 1000 ft
- AUTO VALUE - ROSEAUBrownfields · 1100 ft
- Roseau MobilUnderground Storage Tanks · 1400 ft
- POLARIS INDUSTRIES, INCToxics Release Inventory · 1400 ft
- POLARIS INDUSTRIES, INCBrownfields · 1400 ft
- DENTAL HEALTH OFFICEBrownfields · 1600 ft
- DOLLAR GENERAL STORE 14741Brownfields · 1600 ft
- LIFECARE MEDICAL CENTERBrownfields · 1700 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Roseau'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 Roseau.
Total Sites
74
within ~10 miles of Roseau
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Roseau
Severity Distribution
within ~10 miles of Roseau
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Roseau, Nitrate runs higher than the national average — 20 sites within ~10 miles of Roseau. 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 Roseau
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 Roseau average
Your land is one point inside Roseau
Everything above resolves to Roseau as a whole — one PHZM band and one 28°F frost record, read across 2K 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 city 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 Roseau Average
Roseau Average
- ●USDA Zones 3b, averaged across Roseau
- ●One soil character for all of Roseau
- ●Frost dates read at Roseau's scale: May 6 to Oct 5
YOUR Parcel
- ✓Your exact zone, not Roseau's 3b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Roseau
Pull a site-specific report for your exact address in Roseau, Minnesota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Roseau averages can't show:
We read public map data around Roseau — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Roseau average
How we know this about Roseau
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Roseau’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 city grain anywhere on this page — there is no city-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 Roseau
When does frost risk typically end in Roseau?
The last hard freeze (28°F) in Roseau 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.
When is the first frost in Roseau?
The first hard freeze (28°F) in Roseau 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 152 days after the spring freeze cleared.
How long is the growing season in Roseau?
Measured between 28°F hard freezes, Roseau sees about 152 frost-free days — roughly May 6 through Oct 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 21, about 117 days.
Is the soil safe to grow vegetables in Roseau?
The federal record around Roseau shows 74 documented sites, mostly Brownfields entries (30), the nearest Underground Storage Tanks record under a tenth of a mile 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 Roseau?
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 Roseau's scale — its 3b band and its 152-day season. Your yard writes its own version of Roseau'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 Roseau’s own scale
6 of the readings below were taken at Roseau's own scale — its own ~152-day season between 28°F freezes, the 1,719 acres it covers and 74 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Roseau's own USDA hardiness band, zones 3bUSDA PHZM 2023
- Roseau's own 28°F hard-freeze dates, about May 6 and Oct 5 and the ~152-day span between themNOAA 1991–2020 Climate Normals
- 74 documented contamination sites on the federal record near Roseau, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Roseau's boundary and the 1,719 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 3b and a ~152-day seasonGrowable Ground crop-matching engine
- Roseau sits in the Lake Agassiz Plain — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Roseau's 1,719 acres read through its county's SSURGO summaryfrom Roseau County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Roseau County
- The growing challenges every Minnesota grower plans around — written at state scale, so they stay on the state guidefrom Minnesota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Roseau County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Roseau's 1,719 acreswhy one lot differs from the next →
- Which side of Roseau you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,719 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Roseau-wide figureread your own land →
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