Caro, 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.
The conditions favor cabbage, hazelnut, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Caro, 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 Caro 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 Caro — soil, climate, flood, and parcel records. How we handle your address.
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Caro — the short answer
Caro, Michigan: USDA zone 6a, about 185 days between hard freezes, across 2K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 23
- 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
- ~185
- 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 6a is Caro's average, not your lot's — a low corner or a tree line moves it. Against Caro's 185-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Caro
Each reading below is measured for Caro itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCaro runs about 185 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
MeasuredCaro 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 Caro is in
Caro sits in the Huron/Erie Lake Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Caro's own centroid rather than borrowed from Tuscola County.
What Grows in Caro
Every plant below cleared Caro's own zone 6a and its 185-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Caro?
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 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 23 (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. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Documented around Caro
Survey cells within 31 miles of Caro checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 61 miles off. What to watch for.
What's on the federal record near Caro
Closest first, within ~10 miles of Caro. Listing isn't leaking, and distance isn't exposure.
- QUALITY AUTO PARTS INCBrownfields · 1100 ft
- Village Of CaroUnderground Storage Tanks · 1100 ft
- Vandemarks Auto Parts IncUnderground Storage Tanks · 1100 ft
- Stephens Tire ServiceUnderground Storage Tanks · 1100 ft
- Tuckey Raymond Insurance AgencyUnderground Storage Tanks · 1200 ft
- Whalen Contracting Co IncUnderground Storage Tanks · 1400 ft
- Steven MagieraUnderground Storage Tanks · 1400 ft
- Former Gagetown Gas & Oil TotalUnderground Storage Tanks · 1400 ft
- Village Of Caro (police/fire)Underground Storage Tanks · 1600 ft
- Caro Community SchoolsUnderground Storage Tanks · 1700 ft
- Century Telephone Of Mi, IncUnderground Storage Tanks · 1800 ft
- MIKE MUFFLERS SERVICE CENTER INCBrownfields · 2100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Caro'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 Caro.
Total Sites
128
within ~10 miles of Caro
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Caro
Severity Distribution
within ~10 miles of Caro
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Caro, Underground Storage Tanks runs higher than the national average — 81 sites within ~10 miles of Caro. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Caro
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 Caro average
Your land is one point inside Caro
Everything above resolves to Caro 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 Caro Average
Caro Average
- ●USDA Zones 6a, averaged across Caro
- ●One soil character for all of Caro
- ●Frost dates read at Caro's scale: Apr 23 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Caro's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Caro
Pull a site-specific report for your exact address in Caro, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Caro averages can't show:
We read public map data around Caro — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Caro average
How we know this about Caro
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 Caro’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 Caro
When does frost risk typically end in Caro?
The last hard freeze (28°F) in Caro typically lands around Apr 23, 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 14.
When is the first frost in Caro?
The first hard freeze (28°F) in Caro 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 185 days after the spring freeze cleared.
How long is the growing season in Caro?
Measured between 28°F hard freezes, Caro sees about 185 frost-free days — roughly Apr 23 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 14 to Oct 11, about 150 days.
Is the soil safe to grow vegetables in Caro?
The federal record around Caro is a meaningful one — 128 documented sites, mostly Underground Storage Tanks entries (81), the nearest Brownfields 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 Caro?
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 Caro's scale — its 6a band and its 185-day season. Your yard writes its own version of Caro'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 Caro’s own scale
7 of the readings below were taken at Caro's own scale — its own ~185-day season between 28°F freezes, the 1,884 acres it covers and 128 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Caro's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Caro's own 28°F hard-freeze dates, about Apr 23 and Oct 25 and the ~185-day span between themNOAA 1991–2020 Climate Normals
- 128 documented contamination sites on the federal record near Caro, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Caro's boundary and the 1,884 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~185-day seasonGrowable Ground crop-matching engine
- The ecoregion at Caro's own centroid, the Huron/Erie Lake PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Caro 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 Caro's 1,884 acres read through its county's SSURGO summaryfrom Tuscola County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Tuscola 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 Tuscola County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Caro's 1,884 acreswhy one lot differs from the next →
- Which side of Caro you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,884 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Caro-wide figureread your own land →
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