Portage, 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.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Portage, 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 Portage 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 Portage — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Portage — the short answer
Portage, Michigan: USDA zone 6a, about 200 days between hard freezes, across 21K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~200
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 21K 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 Portage's average, not your lot's — a low corner or a tree line moves it. Against Portage's 200-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Portage
Each reading below is measured for Portage itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPortage runs about 200 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredPortage 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 Portage is in
Portage sits in the Southern Michigan/Northern Indiana Drift Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Portage's own centroid rather than borrowed from Kalamazoo County.
What Grows in Portage
Every plant below cleared Portage's own zone 6a and its 200-day season. Each card opens that plant's Michigan profile. How we score.
Is it too late to plant in Portage?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Portage
Spotted lanternfly documented 15 miles from Portage, first recorded 2023. What to watch for.
What's on the federal record near Portage
Closest first, within ~10 miles of Portage. Listing isn't leaking, and distance isn't exposure.
- Central Middle SchoolUnderground Storage Tanks · 700 ft
- Transportation-Admin BldgUnderground Storage Tanks · 750 ft
- WL MOLDINGBrownfields · 800 ft
- PORTAGE SCHOOLSBrownfields · 900 ft
- LAROS EQUIPMENT CO INCBrownfields · 950 ft
- 03S 11W 22BBCD 01 KALAMAZOO CO (PORTAGE SCHOOL 4)Nitrate · 1000 ft
- COLLISIONRIGHT DBA AUTOBODY USA - SOUTHSIDEBrownfields · 1400 ft
- Portage SteelUnderground Storage Tanks · 1400 ft
- WAL MART SUPERCENTER #5280Brownfields · 1500 ft
- Chicken CoopUnderground Storage Tanks · 1500 ft
- Wickes LumberUnderground Storage Tanks · 1500 ft
- Walmart Supercenter #5280Underground Storage Tanks · 1700 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Portage'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 Portage.
Sources Checked
within ~10 miles of Portage
Severity Distribution
within ~10 miles of Portage
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 Portage
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 Portage average
Your land is one point inside Portage
Everything above resolves to Portage as a whole — one PHZM band and one 28°F frost record, read across 21K 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 Portage Average
Portage Average
- ●USDA Zones 6a, averaged across Portage
- ●One soil character for all of Portage
- ●Frost dates read at Portage's scale: Apr 15 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Portage's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Portage
Pull a site-specific report for your exact address in Portage, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Portage averages can't show:
We read public map data around Portage — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Portage average
How we know this about Portage
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 Portage’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 Portage
When does frost risk typically end in Portage?
The last hard freeze (28°F) in Portage typically lands around Apr 15, 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 6.
When is the first frost in Portage?
The first hard freeze (28°F) in Portage typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 200 days after the spring freeze cleared.
How long is the growing season in Portage?
Measured between 28°F hard freezes, Portage sees about 200 frost-free days — roughly Apr 15 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 6 to Oct 18, about 165 days.
Is the soil safe to grow vegetables in Portage?
The federal record around Portage runs heavier than most — 1,339 documented sites, mostly Underground Storage Tanks entries (596), the nearest Underground Storage Tanks record about 0.1 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Portage?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Portage's scale — its 6a band and its 200-day season. Your yard writes its own version of Portage'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 Portage’s own scale
7 of the readings below were taken at Portage's own scale — its own ~200-day season between 28°F freezes, the 20,622 acres it covers and 1,339 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Portage's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Portage's own 28°F hard-freeze dates, about Apr 15 and Nov 1 and the ~200-day span between themNOAA 1991–2020 Climate Normals
- 1,339 documented contamination sites on the federal record near Portage, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Portage's boundary and the 20,622 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~200-day seasonGrowable Ground crop-matching engine
- The ecoregion at Portage's own centroid, the Southern Michigan/Northern Indiana Drift PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Portagelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Portage's 20,622 acres read through its county's SSURGO summaryfrom Kalamazoo County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Kalamazoo 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 Kalamazoo County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Portage's 20,622 acreswhy one lot differs from the next →
- Which side of Portage you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 20,622 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 Portage-wide figureread your own land →
More in Michigan
Wider growing context
What grows across MichiganPortage sits outside our named growing regions, so Michigan as a whole is its closest context here.
Nearby growing guides