Metro Detroit & Southeast Michigan spans USDA hardiness zones 6a-6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Michigan's warm southeast corner — and the only captured pocket east of the state's Lake Michigan fruit belt. The Monroe–Macomb–Wayne core sits in zone 6b with roughly 203–207 frost-free days, its springs pulled early and its summers pushed hot by the Detroit River, Lake Erie, and the city's urban heat island; the Ann Arbor and Livingston western edge runs a touch cooler at 6a. A different climate engine than the deep-water cherry country up northwest, and the last frost lands about two weeks earlier. Reliable performers under these conditions include cherry, blueberry, apple, and asparagus; what your own ground favors still comes down to its soil, sun, and drainage.
Metro Detroit & Southeast Michigan spans Michigan.
Your yard isn't all of Metro Detroit & Southeast Michigan.
Metro Detroit & Southeast Michigan spans USDA zones 6a-6b, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Metro Detroit & Southeast Michigan — soil, climate, flood, and parcel records. How we handle your address.
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Metro Detroit & Southeast Michigan — the short answer
Metro Detroit & Southeast Michigan: USDA zones 6a-6b, 183–207 frost-free days, in Michigan.
- USDA zones
- 6a-6b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 183–207 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 6
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in Metro Detroit & Southeast Michigan
Plants matched to Metro Detroit & Southeast Michigan's USDA zones 6a-6b, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of Metro Detroit & Southeast Michigan
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets Metro Detroit & Southeast Michigan’s USDA zones 6a-6b — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across Metro Detroit & Southeast Michigan
The USDA soil survey maps this ground county by county. These are those records weighted by land area across six member counties — this region’s own profile, not a state figure.
The ground is predominantly Alfisols, at 58% of mapped acres, followed by Mollisols (14%), Entisols (11%) and Inceptisols (10%). Six soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Wawasee, Fox, and Marlette.
32% of those acres are well drained, and another 27% somewhat poorly drained, 16% poorly drained. Topsoil pH runs 6.1–7.5 between the lowest and the highest county on record. 15% of the footprint is classed prime farmland.
Soil order
Alfisols
Drainage
Well drained
Topsoil pH
6.1–7.5
Hydric soils
29%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Monroe County holds the most wetland ground here, at 50% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in Metro Detroit & Southeast Michigan
The soil survey reads this ground county by county, and the readings above are those records summed across Metro Detroit & Southeast Michigan. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records32% of the mapped acres across Metro Detroit & Southeast Michigan are well drained — ground that drains quickly. That is area-weighted across all six of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across Metro Detroit & Southeast Michigan runs pH 6.1–7.5 — near neutral in all six of them.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Wet ground
From county recordsAbout 29% of the ground across Metro Detroit & Southeast Michigan is mapped as hydric — wetland — soil. Monroe County carries the most, at 50%.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across Metro Detroit & Southeast Michigan — and how to grow with it.
Across Metro Detroit & Southeast Michigan's 6 counties the federal record holds 22,482 documented sites, mostly Brownfields (10,851), Underground Storage Tanks (8,943) and Nitrate (1,208). The heaviest single county is Wayne County, with 8,975.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to Metro Detroit & Southeast Michigan to see which records sit where you actually grow.
Sources Checked
Summed across the 6 counties in Metro Detroit & Southeast Michigan
A note from Gnorman
What an experienced grower watches for around here
In and around Metro Detroit & Southeast Michigan, Superfund runs higher than the national average — 314 sites across the 6 counties in Metro Detroit & Southeast Michigan. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside Metro Detroit & Southeast Michigan
Everything above resolves to Metro Detroit & Southeast Michigan as a whole — a footprint spanning USDA zones 6a-6b. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs Metro Detroit & Southeast Michigan Average
Metro Detroit & Southeast Michigan Average
- ●USDA Zones 6a-6b, averaged across Metro Detroit & Southeast Michigan
- ●One soil character for all of Metro Detroit & Southeast Michigan
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Metro Detroit & Southeast Michigan's 6a-6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Metro Detroit & Southeast Michigan
Pull a site-specific report for your exact address in Metro Detroit & Southeast Michigan — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Metro Detroit & Southeast Michigan averages can't show:
We read public map data around Metro Detroit & Southeast Michigan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not Metro Detroit & Southeast Michigan average
How we know this about Metro Detroit & Southeast Michigan
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about Metro Detroit & Southeast Michigan
What hardiness zone is Metro Detroit & Southeast Michigan?
Metro Detroit & Southeast Michigan spans USDA hardiness zones 6a-6b, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in Metro Detroit & Southeast Michigan?
Measured between 28°F hard freezes, Metro Detroit & Southeast Michigan's counties mostly run 191 to 205 frost-free days, median 203 (NOAA Regional Climate Centers ACIS, 1991–2020, over 6 member counties). That 14-day spread is the honest read — no single season describes 6 counties, and each county guide below carries its own.
When does frost risk end in Metro Detroit & Southeast Michigan?
Across Metro Detroit & Southeast Michigan, the middle half of member counties see their last 28°F hard freeze between Apr 13 and Apr 19 (median Apr 14), and their first fall freeze between Oct 27 and Nov 3. Those are hard freezes, not the last light frost: tender transplants wait for about May 5, and elevation decides which end of a 6-day spread you garden in.
What grows well in Metro Detroit & Southeast Michigan?
Metro Detroit & Southeast Michigan's conditions suit plants such as Cherry, Blueberry, Apple, Asparagus, White Pine. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is Metro Detroit & Southeast Michigan defined?
Metro Detroit & Southeast Michigan is defined here as a curated cluster of 6 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does Metro Detroit & Southeast Michigan cover?
Metro Detroit & Southeast Michigan spans Michigan. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Upper Peninsula, Northern Lower Michigan ("Up North"), Fruit Ridge / West Michigan, Southwest Michigan Wine Coast, Michigan Thumb, and Leelanau & Old Mission Peninsulas share at least one state with Metro Detroit & Southeast Michigan. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at Metro Detroit & Southeast Michigan’s own scale
6 of the readings below were taken at Metro Detroit & Southeast Michigan's own scale — the zone 6a-6b band across its footprint, a median 203-day season across its 6 counties and 22,482 documented federal contamination records across its 6 counties, 8,975 of them in Wayne County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 6a-6b aggregated across all 6 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 6 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 6 counties run 191 to 205 frost-free days, median 203NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 22,482 documented federal contamination records across its 6 counties, 8,975 of them in Wayne County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 58% Alfisols, topsoil pH 6.1–7.5, area-weighted across its 6 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 6a-6bfrom Michigan
What this page can’t tell you
- Which end of the 14-day range your ground sits at — 191 days at one extreme, 205 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore Metro Detroit & Southeast Michigan
State growing guides
Counties in this region
Other growing regions across Michigan
Michigan's coldest, shortest-season growing country. The 15 counties north of the Straits of Mackinac sit in USDA zones 4a-5b — from Iron and Gogebic at 4a to the Lake Superior shore at 5b — with frost-free windows running from roughly 126 days at Iron to the 170s-180s along the moderated lakeshore (Keweenaw ~176, Marquette ~172, Alger ~189). That is a fundamentally different regime than the 200+ day, zone-6/7 orchard belt of southern Lower Michigan (Berrien ~223, Allegan ~217): here the Lake Superior lake-effect snowbelt, late-May last frosts, and a boreal Northern Lakes & Forests landscape select for a short-season, cold-hardy crop list — brassicas, roots, potatoes, hardy greens, and cold-tolerant berries over the long-season warm crops that thrive downstate. A curated destination for growers who need to plan around 4a-5b winters and a season that can be barely four months long.
Up North's interior high plains are Michigan's cold heart: uniformly USDA zone 5a with a short ~145-157-day frost-free season on the sandy jack-pine outwash around Grayling, Gaylord, and Cadillac — a full hardiness zone colder and roughly 40-60 growing days shorter than the lake-warmed Leelanau/Old Mission cherry tip just west (zone 6b, ~176-210 days). Here the droughty, acidic outwash sands and pronounced overnight cold-air pooling make season length and cold-hardiness — not summer heat — the binding constraints on what you can grow.
West Michigan's "Ridge" apple country north of Grand Rapids — an elevated clay-loam moraine moderated by nearby Lake Michigan, spanning USDA zones 5b to 6b and roughly 160 to 207 frost-free days across Kent, Newaygo, Muskegon, and Ottawa counties.
The Lake Michigan Shore AVA — established by the TTB in 1983 (27 CFR §9.130) — makes Southwest Michigan one of the Midwest's oldest federally recognized wine regions, and its four counties (Berrien, Van Buren, Cass, and Allegan) span USDA zones 6a–7a with roughly 207 to 223 frost-free days.
Michigan's Thumb — Huron, Sanilac, and Tuscola counties, the peninsula reaching into Lake Huron between Saginaw Bay and the open lake — sits entirely in USDA hardiness zone 6a, with a frost-free season running roughly 185 to 200 days across the three counties.
Two narrow Lake Michigan peninsulas where deep water holds off spring and fall frost — the heart of Michigan's tart-cherry and cool-climate wine country.