Big Bay, Michigan, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include cabbage, hazelnut, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Big Bay, 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 Big Bay 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 Big Bay — soil, climate, flood, and parcel records. How we handle your address.
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Big Bay — the short answer
Big Bay, Michigan: USDA zone 6a, about 183 days between hard freezes, across 2K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~183
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town 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 Big Bay's average, not your lot's — a low corner or a tree line moves it. Against Big Bay's 183-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Big Bay
Each reading below is measured for Big Bay itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBig Bay runs about 183 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
MeasuredBig Bay 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 Big Bay is in
Big Bay sits in the Northern Lakes and Forests — EPA Level III, inside the wider Northern Forests. That is read at Big Bay's own centroid rather than borrowed from Marquette County.
What Grows in Big Bay
Every plant below cleared Big Bay's own zone 6a and its 183-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Big Bay?
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 Apr 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 2 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Big Bay
Closest first, within ~10 miles of Big Bay. Listing isn't leaking, and distance isn't exposure.
- LIGHTHOUSE THREE INCBrownfields · 400 ft
- 51N 27W 15BDBB01 MARQUETTE CO (POWELL TWP)Nitrate · 0.7 mi
- Giannunzio OilUnderground Storage Tanks · 1.0 mi
- TOWNSHIP OF POWELL SCHOOLSBrownfields · 1.0 mi
- Powell Twp School DistrictUnderground Storage Tanks · 1.0 mi
- Big Bay Outpost and Deli IncUnderground Storage Tanks · 1.0 mi
- Big Bay District GarageUnderground Storage Tanks · 1.1 mi
- Huron Mountain ClubUnderground Storage Tanks · 1.2 mi
- Big Bay HarborUnderground Storage Tanks · 1.2 mi
- 51N 27W 09DAC 01 MARQUETTE CO (BAY CLIFF)Nitrate · 1.4 mi
- 51N 27W 01CAC 01 MARQUETTE CO (PICK)Nitrate · 2.2 mi
- Kona DolomiteMining · 2.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Big Bay'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 Big Bay.
Total Sites
33
within ~10 miles of Big Bay
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Big Bay
Severity Distribution
within ~10 miles of Big Bay
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Big Bay, two things run higher than the national average within ~10 miles of Big Bay — Nitrate (20 sites) and Mining (3 sites). That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Big Bay
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 Big Bay average
Your land is one point inside Big Bay
Everything above resolves to Big Bay 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 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 Big Bay Average
Big Bay Average
- ●USDA Zones 6a, averaged across Big Bay
- ●One soil character for all of Big Bay
- ●Frost dates read at Big Bay's scale: May 3 to Nov 2
YOUR Parcel
- ✓Your exact zone, not Big Bay's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Big Bay
Pull a site-specific report for your exact address in Big Bay, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Big Bay averages can't show:
We read public map data around Big Bay — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Big Bay average
How we know this about Big Bay
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 Big Bay’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 Big Bay
When does frost risk typically end in Big Bay?
The last hard freeze (28°F) in Big Bay typically lands around May 3, 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 24.
When is the first frost in Big Bay?
The first hard freeze (28°F) in Big Bay typically arrives around Nov 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 19, so the watching starts about Oct 3 — about 183 days after the spring freeze cleared.
How long is the growing season in Big Bay?
Measured between 28°F hard freezes, Big Bay sees about 183 frost-free days — roughly May 3 through Nov 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 24 to Oct 19, about 148 days.
Is the soil safe to grow vegetables in Big Bay?
The federal record around Big Bay is light — 33 documented sites across the 9 federal source types we checked, mostly Nitrate entries (20), the nearest Brownfields record under a tenth of a mile out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Big Bay?
From about Oct 3 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 Nov 2 (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 Nov 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Big Bay's scale — its 6a band and its 183-day season. Your yard writes its own version of Big Bay'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 Big Bay’s own scale
6 of the readings below were taken at Big Bay's own scale — its own ~183-day season between 28°F freezes, the 2,493 acres it covers and 33 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Big Bay's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Big Bay's own 28°F hard-freeze dates, about May 3 and Nov 2 and the ~183-day span between themNOAA 1991–2020 Climate Normals
- 33 documented contamination sites on the federal record near Big Bay, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Big Bay's boundary and the 2,493 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~183-day seasonGrowable Ground crop-matching engine
- The ecoregion at Big Bay's own centroid, the Northern Lakes and ForestsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Big Bay's 2,493 acres read through its county's SSURGO summaryfrom Marquette County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Marquette 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 Marquette County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Big Bay's 2,493 acreswhy one lot differs from the next →
- Which side of Big Bay you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,493 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Big Bay-wide figureread your own land →
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