Swanville, Minnesota, sits in USDA hardiness zone 4a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 Swanville, 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 Swanville 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 Swanville — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Swanville — the short answer
Swanville, Minnesota: USDA zone 4a, about 169 days between hard freezes, across 337 acres of city.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~169
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 337 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 Swanville's average, not your lot's — a low corner or a tree line moves it. Against Swanville's 169-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Swanville
Each reading below is measured for Swanville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSwanville runs about 169 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
MeasuredSwanville 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 Swanville is in
Swanville sits in the North Central Hardwood Forests — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Swanville's own centroid rather than borrowed from Morrison County.
What Grows in Swanville
Every plant below cleared Swanville's own zone 4a and its 169-day season. Each card opens that plant's Minnesota profile. How we score.
Is it too late to plant in Swanville?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 13 — 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 Swanville
Closest first, within ~10 miles of Swanville. Listing isn't leaking, and distance isn't exposure.
- Kamps Korner Llc.Underground Storage Tanks · 500 ft
- PERFECTION CRANE & HOIST INCBrownfields · 550 ft
- NILSONS HARDWARE & RENT IT CENTER INCBrownfields · 600 ft
- Lovens 76 ServiceUnderground Storage Tanks · 950 ft
- ISD 486 SWANVILLE PUBLIC SCHOOLSBrownfields · 950 ft
- JENNIE-O TURKEY STORE SWANVILLE FEED MILLBrownfields · 1200 ft
- JENNIE-O TURKEY STORE SWANVILLE FEED MILLToxics Release Inventory · 1200 ft
- Delclayna Pay at the PumpUnderground Storage Tanks · 1600 ft
- 140284Nitrate · 1.3 mi
- MGT PRODUCTS LLCCAFO · 1.8 mi
- Pillsbury StoreUnderground Storage Tanks · 1.9 mi
- Pillsbury Burnhamville TownshipUnderground Storage Tanks · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Swanville'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 Swanville.
Total Sites
119
within ~10 miles of Swanville
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Swanville
Severity Distribution
within ~10 miles of Swanville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Swanville, two things run higher than the national average within ~10 miles of Swanville — CAFO (13 sites) and Nitrate (74 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Swanville
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 Swanville average
Your land is one point inside Swanville
Everything above resolves to Swanville as a whole — one PHZM band and one 28°F frost record, read across 337 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 Swanville Average
Swanville Average
- ●USDA Zones 4a, averaged across Swanville
- ●One soil character for all of Swanville
- ●Frost dates read at Swanville's scale: Apr 27 to Oct 13
YOUR Parcel
- ✓Your exact zone, not Swanville's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Swanville
Pull a site-specific report for your exact address in Swanville, Minnesota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Swanville averages can't show:
We read public map data around Swanville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Swanville average
How we know this about Swanville
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 Swanville’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 Swanville
When does frost risk typically end in Swanville?
The last hard freeze (28°F) in Swanville typically lands around Apr 27, 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 18.
When is the first frost in Swanville?
The first hard freeze (28°F) in Swanville typically arrives around Oct 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 29, so the watching starts about Sep 13 — about 169 days after the spring freeze cleared.
How long is the growing season in Swanville?
Measured between 28°F hard freezes, Swanville sees about 169 frost-free days — roughly Apr 27 through Oct 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 18 to Sep 29, about 134 days.
Is the soil safe to grow vegetables in Swanville?
The federal record around Swanville shows 119 documented sites, mostly Nitrate entries (74), 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 Swanville?
From about Sep 13 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 13 (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 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Swanville's scale — its 4a band and its 169-day season. Your yard writes its own version of Swanville'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 Swanville’s own scale
6 of the readings below were taken at Swanville's own scale — its own ~169-day season between 28°F freezes, the 337 acres it covers and 119 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Swanville's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Swanville's own 28°F hard-freeze dates, about Apr 27 and Oct 13 and the ~169-day span between themNOAA 1991–2020 Climate Normals
- 119 documented contamination sites on the federal record near Swanville, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Swanville's boundary and the 337 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~169-day seasonGrowable Ground crop-matching engine
- The ecoregion at Swanville's own centroid, the North Central Hardwood ForestsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Swanville's 337 acres read through its county's SSURGO summaryfrom Morrison County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Morrison 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 Morrison County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Swanville's 337 acreswhy one lot differs from the next →
- Which side of Swanville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 337 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 Swanville-wide figureread your own land →
More in Minnesota
Wider growing context
What grows across MinnesotaSwanville sits outside our named growing regions, so Minnesota as a whole is its closest context here.
Nearby growing guides