Brown City, 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.
These conditions suit cabbage, blackberry, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Brown City, 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 Brown City 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 Brown City — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Brown City — the short answer
Brown City, Michigan: USDA zone 6a, about 179 days between hard freezes, across 726 acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~179
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 726 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 Brown City's average, not your lot's — a low corner or a tree line moves it. Against Brown City's 179-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Brown City
Each reading below is measured for Brown City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBrown City runs about 179 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
MeasuredBrown City 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 Brown City is in
Brown City sits in the Huron/Erie Lake Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Brown City's own centroid rather than borrowed from Sanilac County.
What Grows in Brown City
Every plant below cleared Brown City's own zone 6a and its 179-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Brown City?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 29; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 22 — 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 Brown City
Survey cells within 31 miles of Brown City checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 44 miles off. What to watch for.
What's on the federal record near Brown City
Closest first, within ~10 miles of Brown City. Listing isn't leaking, and distance isn't exposure.
- Amoco Oil CoUnderground Storage Tanks · 250 ft
- GREAT REFLECTIONSBrownfields · 500 ft
- Red Barn Market #6 iIncUnderground Storage Tanks · 700 ft
- SHELL OIL COMPANYBrownfields · 750 ft
- MAPLE VALLEY PLASTICS LLCBrownfields · 1000 ft
- Brown City SchoolsUnderground Storage Tanks · 1200 ft
- Brown City BPUnderground Storage Tanks · 2000 ft
- MAXTERIAL INCBrownfields · 2500 ft
- PLASTA FIBER INDToxics Release Inventory · 2600 ft
- A G DAVIS GAGE & ENGINEERING COBrownfields · 2600 ft
- EXPLORER MOTOR HOMES DIVToxics Release Inventory · 0.5 mi
- SALVO TOOL AND ENGINEERING COBrownfields · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Brown City'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 Brown City.
Total Sites
109
within ~10 miles of Brown City
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Brown City
Severity Distribution
within ~10 miles of Brown City
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 Brown City
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 Brown City average
Your land is one point inside Brown City
Everything above resolves to Brown City as a whole — one PHZM band and one 28°F frost record, read across 726 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 Brown City Average
Brown City Average
- ●USDA Zones 6a, averaged across Brown City
- ●One soil character for all of Brown City
- ●Frost dates read at Brown City's scale: Apr 26 to Oct 22
YOUR Parcel
- ✓Your exact zone, not Brown City's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Brown City
Pull a site-specific report for your exact address in Brown City, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Brown City averages can't show:
We read public map data around Brown City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Brown City average
How we know this about Brown City
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 Brown City’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 Brown City
When does frost risk typically end in Brown City?
The last hard freeze (28°F) in Brown City typically lands around Apr 26, 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 17.
When is the first frost in Brown City?
The first hard freeze (28°F) in Brown City typically arrives around Oct 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 8, so the watching starts about Sep 22 — about 179 days after the spring freeze cleared.
How long is the growing season in Brown City?
Measured between 28°F hard freezes, Brown City sees about 179 frost-free days — roughly Apr 26 through Oct 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 17 to Oct 8, about 144 days.
Is the soil safe to grow vegetables in Brown City?
The federal record around Brown City shows 109 documented sites, mostly Underground Storage Tanks entries (57), 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 Brown City?
From about Sep 22 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Brown City's scale — its 6a band and its 179-day season. Your yard writes its own version of Brown City'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 Brown City’s own scale
7 of the readings below were taken at Brown City's own scale — its own ~179-day season between 28°F freezes, the 726 acres it covers and 109 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Brown City's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Brown City's own 28°F hard-freeze dates, about Apr 26 and Oct 22 and the ~179-day span between themNOAA 1991–2020 Climate Normals
- 109 documented contamination sites on the federal record near Brown City, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Brown City's boundary and the 726 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~179-day seasonGrowable Ground crop-matching engine
- The ecoregion at Brown City's own centroid, the Huron/Erie Lake PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Brown City 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 Brown City's 726 acres read through its county's SSURGO summaryfrom Sanilac County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Sanilac 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 Sanilac County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Brown City's 726 acreswhy one lot differs from the next →
- Which side of Brown City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 726 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 Brown City-wide figureread your own land →
More in Michigan
Growing region
Nearby growing guides