Grass Lake, Michigan, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Grass Lake, 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 Grass Lake 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 Grass Lake — soil, climate, flood, and parcel records. How we handle your address.
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Grass Lake — the short answer
Grass Lake, Michigan: USDA zone 6a, about 188 days between hard freezes, across 602 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 20
- 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
- ~188
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 602 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 Grass Lake's average, not your lot's — a low corner or a tree line moves it. Against Grass Lake's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grass Lake
Each reading below is measured for Grass Lake itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGrass Lake runs about 188 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
MeasuredGrass Lake 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 Grass Lake is in
Grass Lake sits in the Southern Michigan/Northern Indiana Drift Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Grass Lake's own centroid rather than borrowed from Jackson County.
What Grows in Grass Lake
Every plant below cleared Grass Lake's own zone 6a and its 188-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Grass Lake?
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 23; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 20 (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. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Grass Lake
Survey cells within 31 miles of Grass Lake checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 47 miles off. What to watch for.
What's on the federal record near Grass Lake
Closest first, within ~10 miles of Grass Lake. Listing isn't leaking, and distance isn't exposure.
- Grass Lake Mini Mart IncUnderground Storage Tanks · 700 ft
- Save Time 98Underground Storage Tanks · 1400 ft
- AEROSPACE INCBrownfields · 1500 ft
- Grass Lake Community SchoolsUnderground Storage Tanks · 1600 ft
- MOONEY OIL CORPBrownfields · 1800 ft
- Clarence E & Joyce SagerUnderground Storage Tanks · 2000 ft
- STONE AUTO GROUP LLCBrownfields · 2400 ft
- Jim Moss ServiceUnderground Storage Tanks · 2500 ft
- Se/4, Se/4, Sec.35, T2s, R2eUnderground Storage Tanks · 0.7 mi
- Siegrist Chevrolet, IncUnderground Storage Tanks · 0.8 mi
- GRASS LAKE AUTOMOTIVE LLCBrownfields · 0.8 mi
- Mugg & Bopp'sUnderground Storage Tanks · 2.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Grass Lake'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 Grass Lake.
Total Sites
461
within ~10 miles of Grass Lake
Risk Level
Elevated
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Grass Lake
Severity Distribution
within ~10 miles of Grass Lake
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Grass Lake, Superfund runs higher than the national average — 6 sites within ~10 miles of Grass Lake. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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).
Check your specific parcel in Grass Lake
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 Grass Lake average
Your land is one point inside Grass Lake
Everything above resolves to Grass Lake as a whole — one PHZM band and one 28°F frost record, read across 602 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 Grass Lake Average
Grass Lake Average
- ●USDA Zones 6a, averaged across Grass Lake
- ●One soil character for all of Grass Lake
- ●Frost dates read at Grass Lake's scale: Apr 20 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Grass Lake's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grass Lake
Pull a site-specific report for your exact address in Grass Lake, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grass Lake averages can't show:
We read public map data around Grass Lake — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grass Lake average
How we know this about Grass Lake
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 Grass Lake’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 Grass Lake
When does frost risk typically end in Grass Lake?
The last hard freeze (28°F) in Grass Lake typically lands around Apr 20, 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 11.
When is the first frost in Grass Lake?
The first hard freeze (28°F) in Grass Lake 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 188 days after the spring freeze cleared.
How long is the growing season in Grass Lake?
Measured between 28°F hard freezes, Grass Lake sees about 188 frost-free days — roughly Apr 20 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 11 to Oct 11, about 153 days.
Is the soil safe to grow vegetables in Grass Lake?
The federal record around Grass Lake is a meaningful one — 461 documented sites, mostly Underground Storage Tanks entries (215), the nearest Underground Storage Tanks record about 0.1 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 Grass Lake?
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 Grass Lake's scale — its 6a band and its 188-day season. Your yard writes its own version of Grass Lake'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 Grass Lake’s own scale
7 of the readings below were taken at Grass Lake's own scale — its own ~188-day season between 28°F freezes, the 602 acres it covers and 461 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Grass Lake's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Grass Lake's own 28°F hard-freeze dates, about Apr 20 and Oct 25 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 461 documented contamination sites on the federal record near Grass Lake, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Grass Lake's boundary and the 602 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~188-day seasonGrowable Ground crop-matching engine
- The ecoregion at Grass Lake's own centroid, the Southern Michigan/Northern Indiana Drift PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Grass Lake 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 Grass Lake's 602 acres read through its county's SSURGO summaryfrom Jackson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jackson 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 Jackson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Grass Lake's 602 acreswhy one lot differs from the next →
- Which side of Grass Lake you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 602 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Grass Lake-wide figureread your own land →
More in Michigan
Wider growing context
What grows across MichiganGrass Lake sits outside our named growing regions, so Michigan as a whole is its closest context here.
Nearby growing guides