Ionia, 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.
A short list that earns its place here — cabbage, hazelnut, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Ionia, 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 Ionia 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 Ionia — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Ionia — the short answer
Ionia, Michigan: USDA zone 6a, about 186 days between hard freezes, across 3K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~186
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 Ionia's average, not your lot's — a low corner or a tree line moves it. Against Ionia's 186-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ionia
Each reading below is measured for Ionia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredIonia runs about 186 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
MeasuredIonia 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 Ionia is in
Ionia sits in the Southern Michigan/Northern Indiana Drift Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Ionia's own centroid rather than borrowed from Ionia County.
What Grows in Ionia
Every plant below cleared Ionia's own zone 6a and its 186-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Ionia?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 25 — 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 Ionia
Survey cells within 31 miles of Ionia checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 75 miles off. What to watch for.
What's on the federal record near Ionia
Closest first, within ~10 miles of Ionia. Listing isn't leaking, and distance isn't exposure.
- City of Ionia WWTPUnderground Storage Tanks · 950 ft
- IONIA FORD MERCURYBrownfields · 1500 ft
- Caswell & CoUnderground Storage Tanks · 1500 ft
- FAMILY DOLLAR STORESBrownfields · 1700 ft
- VENTRA GREENWICH HOLDINGS CORPToxics Release Inventory · 1800 ft
- VENTRA GREENWICH HOLDINGS CORPBrownfields · 1800 ft
- Total Car WashUnderground Storage Tanks · 1900 ft
- HAMBLIN BODY SHOPBrownfields · 2000 ft
- THE BROWN CORPORATION OF IONIA, LLCBrownfields · 2000 ft
- Ionia Garage & StrmUnderground Storage Tanks · 2000 ft
- 406 STEELE LLCBrownfields · 2000 ft
- Todd & Ross, IncUnderground Storage Tanks · 2100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Ionia'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 Ionia.
Sources Checked
within ~10 miles of Ionia
Severity Distribution
within ~10 miles of Ionia
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Ionia
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 Ionia average
Your land is one point inside Ionia
Everything above resolves to Ionia as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Ionia Average
Ionia Average
- ●USDA Zones 6a, averaged across Ionia
- ●One soil character for all of Ionia
- ●Frost dates read at Ionia's scale: Apr 22 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Ionia's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ionia
Pull a site-specific report for your exact address in Ionia, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ionia averages can't show:
We read public map data around Ionia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ionia average
How we know this about Ionia
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 Ionia’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 Ionia
When does frost risk typically end in Ionia?
The last hard freeze (28°F) in Ionia typically lands around Apr 22, 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 13.
When is the first frost in Ionia?
The first hard freeze (28°F) in Ionia typically arrives around Oct 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 11, so the watching starts about Sep 25 — about 186 days after the spring freeze cleared.
How long is the growing season in Ionia?
Measured between 28°F hard freezes, Ionia sees about 186 frost-free days — roughly Apr 22 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 13 to Oct 11, about 151 days.
Is the soil safe to grow vegetables in Ionia?
The federal record around Ionia is a meaningful one — 218 documented sites, mostly Underground Storage Tanks entries (127), 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.
How do I protect my plants from frost in Ionia?
From about Sep 25 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ionia's scale — its 6a band and its 186-day season. Your yard writes its own version of Ionia'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 Ionia’s own scale
7 of the readings below were taken at Ionia's own scale — its own ~186-day season between 28°F freezes, the 3,463 acres it covers and 218 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Ionia's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Ionia's own 28°F hard-freeze dates, about Apr 22 and Oct 25 and the ~186-day span between themNOAA 1991–2020 Climate Normals
- 218 documented contamination sites on the federal record near Ionia, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Ionia's boundary and the 3,463 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~186-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ionia's own centroid, the Southern Michigan/Northern Indiana Drift PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Ionia 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 Ionia's 3,463 acres read through its county's SSURGO summaryfrom Ionia County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Ionia 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 Ionia County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ionia's 3,463 acreswhy one lot differs from the next →
- Which side of Ionia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,463 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Ionia-wide figureread your own land →
More in Michigan
Wider growing context
What grows across MichiganIonia sits outside our named growing regions, so Michigan as a whole is its closest context here.