Ortonville, Michigan, sits in USDA hardiness zone 6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
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 Ortonville, 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 Ortonville 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 Ortonville — soil, climate, flood, and parcel records. How we handle your address.
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Ortonville — the short answer
Ortonville, Michigan: USDA zone 6a, about 198 days between hard freezes, across 617 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~198
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 617 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 Ortonville's average, not your lot's — a low corner or a tree line moves it. Against Ortonville's 198-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ortonville
Each reading below is measured for Ortonville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOrtonville runs about 198 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
MeasuredOrtonville 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 Ortonville is in
Ortonville sits in the Southern Michigan/Northern Indiana Drift Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Ortonville's own centroid rather than borrowed from Oakland County.
What Grows in Ortonville
Every plant below cleared Ortonville's own zone 6a and its 198-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Ortonville?
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 Mar 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 31 — 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 Ortonville
Spotted lanternfly documented 18 miles from Ortonville, first recorded 2022. What to watch for.
What's on the federal record near Ortonville
Closest first, within ~10 miles of Ortonville. Listing isn't leaking, and distance isn't exposure.
- Brandon Fire & Police BoardUnderground Storage Tanks · 2100 ft
- Charter Twp Of BrandonUnderground Storage Tanks · 2400 ft
- Hamiltons Of OrtonvilleUnderground Storage Tanks · 0.5 mi
- DANDY OIL COMPANYBrownfields · 0.5 mi
- Dandy Oil IncUnderground Storage Tanks · 0.6 mi
- MARSH AUTO SALES LLCBrownfields · 0.6 mi
- Owen Motors, IncUnderground Storage Tanks · 0.6 mi
- TRACTOR SUPPLY COMPANY #1245Brownfields · 0.7 mi
- Little Caeser's PizzaUnderground Storage Tanks · 0.7 mi
- Brandon School DistrictUnderground Storage Tanks · 0.8 mi
- FUTURA COLLISIONBrownfields · 0.8 mi
- ENGINEERING TUBE SPECIALTIESBrownfields · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Ortonville'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 Ortonville.
Total Sites
526
within ~10 miles of Ortonville
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Ortonville
Severity Distribution
within ~10 miles of Ortonville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Ortonville, two things run higher than the national average within ~10 miles of Ortonville — Nitrate (160 sites) and PFAS (5 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Ortonville
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 Ortonville average
Your land is one point inside Ortonville
Everything above resolves to Ortonville as a whole — one PHZM band and one 28°F frost record, read across 617 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 Ortonville Average
Ortonville Average
- ●USDA Zones 6a, averaged across Ortonville
- ●One soil character for all of Ortonville
- ●Frost dates read at Ortonville's scale: Apr 16 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Ortonville's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ortonville
Pull a site-specific report for your exact address in Ortonville, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ortonville averages can't show:
We read public map data around Ortonville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ortonville average
How we know this about Ortonville
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 Ortonville’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 Ortonville
When does frost risk typically end in Ortonville?
The last hard freeze (28°F) in Ortonville typically lands around Apr 16, 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 7.
When is the first frost in Ortonville?
The first hard freeze (28°F) in Ortonville typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 198 days after the spring freeze cleared.
How long is the growing season in Ortonville?
Measured between 28°F hard freezes, Ortonville sees about 198 frost-free days — roughly Apr 16 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 7 to Oct 17, about 163 days.
Is the soil safe to grow vegetables in Ortonville?
The federal record around Ortonville is a meaningful one — 526 documented sites, mostly Brownfields entries (169), the nearest Underground Storage Tanks record about 0.4 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 Ortonville?
From about Oct 1 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 31 (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 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ortonville's scale — its 6a band and its 198-day season. Your yard writes its own version of Ortonville'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 Ortonville’s own scale
7 of the readings below were taken at Ortonville's own scale — its own ~198-day season between 28°F freezes, the 617 acres it covers and 526 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Ortonville's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Ortonville's own 28°F hard-freeze dates, about Apr 16 and Oct 31 and the ~198-day span between themNOAA 1991–2020 Climate Normals
- 526 documented contamination sites on the federal record near Ortonville, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Ortonville's boundary and the 617 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~198-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ortonville's own centroid, the Southern Michigan/Northern Indiana Drift PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Ortonvillelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Ortonville's 617 acres read through its county's SSURGO summaryfrom Oakland County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Oakland 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 Oakland County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ortonville's 617 acreswhy one lot differs from the next →
- Which side of Ortonville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 617 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Ortonville-wide figureread your own land →