Alpena, Michigan, sits in USDA hardiness zone 6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Alpena, 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 Alpena 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 Alpena — soil, climate, flood, and parcel records. How we handle your address.
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Alpena — the short answer
Alpena, Michigan: USDA zone 6a, about 190 days between hard freezes, across 5K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~190
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 5K 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 Alpena's average, not your lot's — a low corner or a tree line moves it. Against Alpena's 190-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Alpena
Each reading below is measured for Alpena itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAlpena runs about 190 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
MeasuredAlpena 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 Alpena is in
Alpena sits in the Northern Lakes and Forests — EPA Level III, inside the wider Northern Forests. That is read at Alpena's own centroid rather than borrowed from Alpena County.
What Grows in Alpena
Every plant below cleared Alpena's own zone 6a and its 190-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Alpena?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — 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.
What's on the federal record near Alpena
Closest first, within ~10 miles of Alpena. Listing isn't leaking, and distance isn't exposure.
- Chets Super ServiceUnderground Storage Tanks · 900 ft
- SUPERIOR FABRICATING PROPERTYBrownfields · 950 ft
- Alpena Big Boy Parking LotUnderground Storage Tanks · 1000 ft
- Alpena EZ MartUnderground Storage Tanks · 1000 ft
- BLARNEY CASTLE OIL COBrownfields · 1000 ft
- Chisholm ShellUnderground Storage Tanks · 1100 ft
- BESSER COBrownfields · 1300 ft
- Besser CoUnderground Storage Tanks · 1400 ft
- WERTH CLEANERS AND LAUNDRY INCBrownfields · 1600 ft
- ALPENA HIDE AND LEATHER COMPANYBrownfields · 1700 ft
- Alpena General HospitalUnderground Storage Tanks · 1800 ft
- MID MICHIGAN MEDICAL CENTER - ALPENABrownfields · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Alpena'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 Alpena.
Total Sites
233
within ~10 miles of Alpena
Risk Level
Elevated
Highest-severity
5 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Alpena
Severity Distribution
within ~10 miles of Alpena
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Alpena, Superfund runs higher than the national average — 5 sites within ~10 miles of Alpena. 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).
Check your specific parcel in Alpena
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 Alpena average
Your land is one point inside Alpena
Everything above resolves to Alpena as a whole — one PHZM band and one 28°F frost record, read across 5K 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 Alpena Average
Alpena Average
- ●USDA Zones 6a, averaged across Alpena
- ●One soil character for all of Alpena
- ●Frost dates read at Alpena's scale: Apr 22 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Alpena's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Alpena
Pull a site-specific report for your exact address in Alpena, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Alpena averages can't show:
We read public map data around Alpena — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alpena average
How we know this about Alpena
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 Alpena’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 Alpena
When does frost risk typically end in Alpena?
The last hard freeze (28°F) in Alpena typically lands around Apr 22, 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 13.
When is the first frost in Alpena?
The first hard freeze (28°F) in Alpena typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 190 days after the spring freeze cleared.
How long is the growing season in Alpena?
Measured between 28°F hard freezes, Alpena sees about 190 frost-free days — roughly Apr 22 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 13 to Oct 15, about 155 days.
Is the soil safe to grow vegetables in Alpena?
The federal record around Alpena is a meaningful one — 233 documented sites, mostly Underground Storage Tanks entries (127), the nearest Underground Storage Tanks 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 Alpena?
From about Sep 29 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Alpena's scale — its 6a band and its 190-day season. Your yard writes its own version of Alpena'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 Alpena’s own scale
6 of the readings below were taken at Alpena's own scale — its own ~190-day season between 28°F freezes, the 5,230 acres it covers and 233 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Alpena's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Alpena's own 28°F hard-freeze dates, about Apr 22 and Oct 29 and the ~190-day span between themNOAA 1991–2020 Climate Normals
- 233 documented contamination sites on the federal record near Alpena, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Alpena's boundary and the 5,230 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~190-day seasonGrowable Ground crop-matching engine
- The ecoregion at Alpena'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 Alpena's 5,230 acres read through its county's SSURGO summaryfrom Alpena County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Alpena 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 Alpena County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Alpena's 5,230 acreswhy one lot differs from the next →
- Which side of Alpena you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,230 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Alpena-wide figureread your own land →
More in Michigan
Wider growing context
What grows across MichiganAlpena sits outside our named growing regions, so Michigan as a whole is its closest context here.
Nearby growing guides