Plainwell, Michigan, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include cabbage, blackberry, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Plainwell, 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 Plainwell 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 Plainwell — soil, climate, flood, and parcel records. How we handle your address.
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Plainwell — the short answer
Plainwell, Michigan: USDA zone 6a, about 180 days between hard freezes, across 1K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~180
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 6a is Plainwell's average, not your lot's — a low corner or a tree line moves it. Against Plainwell's 180-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Plainwell
Each reading below is measured for Plainwell itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPlainwell runs about 180 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
MeasuredPlainwell sits in USDA hardiness zone 6a.
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 Plainwell is in
Plainwell sits in the Southern Michigan/Northern Indiana Drift Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Plainwell's own centroid rather than borrowed from Allegan County.
What Grows in Plainwell
Every plant below cleared Plainwell's own zone 6a and its 180-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Plainwell?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 21 — 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.
Documented around Plainwell
Survey cells within 31 miles of Plainwell checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 32 miles off. What to watch for.
What's on the federal record near Plainwell
Closest first, within ~10 miles of Plainwell. Listing isn't leaking, and distance isn't exposure.
- KOESTNER JIM INCBrownfields · 150 ft
- Jim Koestner IncUnderground Storage Tanks · 150 ft
- Plainwell Auto Supply CoUnderground Storage Tanks · 350 ft
- Atrestlebridge Properties IncUnderground Storage Tanks · 400 ft
- City HallUnderground Storage Tanks · 450 ft
- Lakes Dry Cleaners & Shirt ServiUnderground Storage Tanks · 500 ft
- LAKES DRYCLNRS AND SHIRT SERVICEBrownfields · 500 ft
- Fire Dept BuildingUnderground Storage Tanks · 700 ft
- Amoco Oil CoUnderground Storage Tanks · 850 ft
- Circle K 6303Underground Storage Tanks · 850 ft
- Sun Theater Parking LotUnderground Storage Tanks · 950 ft
- Plainwell Paper Co IncUnderground Storage Tanks · 1100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Plainwell'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 Plainwell.
Total Sites
337
within ~10 miles of Plainwell
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Plainwell
Severity Distribution
within ~10 miles of Plainwell
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Plainwell, Toxics Release Inventory runs higher than the national average — 30 sites within ~10 miles of Plainwell. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Plainwell
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 Plainwell average
Your land is one point inside Plainwell
Everything above resolves to Plainwell as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Plainwell Average
Plainwell Average
- ●USDA Zones 6a, averaged across Plainwell
- ●One soil character for all of Plainwell
- ●Frost dates read at Plainwell's scale: Apr 24 to Oct 21
YOUR Parcel
- ✓Your exact zone, not Plainwell's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Plainwell
Pull a site-specific report for your exact address in Plainwell, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Plainwell averages can't show:
We read public map data around Plainwell — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Plainwell average
How we know this about Plainwell
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 Plainwell’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 Plainwell
When does frost risk typically end in Plainwell?
The last hard freeze (28°F) in Plainwell typically lands around Apr 24, 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 15.
When is the first frost in Plainwell?
The first hard freeze (28°F) in Plainwell typically arrives around Oct 21, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 7, so the watching starts about Sep 21 — about 180 days after the spring freeze cleared.
How long is the growing season in Plainwell?
Measured between 28°F hard freezes, Plainwell sees about 180 frost-free days — roughly Apr 24 through Oct 21, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 15 to Oct 7, about 145 days.
Is the soil safe to grow vegetables in Plainwell?
The federal record around Plainwell is a meaningful one — 337 documented sites, mostly Underground Storage Tanks entries (153), the nearest Brownfields record under a tenth of a mile 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.
How do I protect my plants from frost in Plainwell?
From about Sep 21 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 21 (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 21. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Plainwell's scale — its 6a band and its 180-day season. Your yard writes its own version of Plainwell'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 Plainwell’s own scale
7 of the readings below were taken at Plainwell's own scale — its own ~180-day season between 28°F freezes, the 1,328 acres it covers and 337 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Plainwell's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Plainwell's own 28°F hard-freeze dates, about Apr 24 and Oct 21 and the ~180-day span between themNOAA 1991–2020 Climate Normals
- 337 documented contamination sites on the federal record near Plainwell, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Plainwell's boundary and the 1,328 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~180-day seasonGrowable Ground crop-matching engine
- The ecoregion at Plainwell's own centroid, the Southern Michigan/Northern Indiana Drift PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Plainwell checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Plainwell's 1,328 acres read through its county's SSURGO summaryfrom Allegan County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Allegan County
- The growing challenges every Michigan grower plans around — written at state scale, so they stay on the state guidefrom Michigan
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Allegan County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Plainwell's 1,328 acreswhy one lot differs from the next →
- Which side of Plainwell you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,328 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Plainwell-wide figureread your own land →
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