Detroit, Oregon, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, fig, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Detroit, 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 Detroit 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 Detroit — soil, climate, flood, and parcel records. How we handle your address.
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Detroit — the short answer
Detroit, Oregon: USDA zone 8b, about 231 days between hard freezes, across 375 acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~231
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 375 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 8b is Detroit's average, not your lot's — a low corner or a tree line moves it. Against Detroit's 231-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Detroit
Each reading below is measured for Detroit itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDetroit runs about 231 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
MeasuredDetroit sits in USDA hardiness zone 8b.
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 Detroit is in
Detroit sits in the Cascades — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Detroit's own centroid, and it is not what its county reads: Marion County is mostly Willamette Valley. The wider page above you is answering a different question about different ground.
What Grows in Detroit
Every plant below cleared Detroit's own zone 8b and its 231-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Detroit?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 17 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Detroit
Closest first, within ~10 miles of Detroit. Listing isn't leaking, and distance isn't exposure.
- DETROIT CENTRAL OFFICEUnderground Storage Tanks · 400 ft
- OR ST HWY 2-3 MINTO MP 65.0Underground Storage Tanks · 750 ft
- KANES HIDEAWAY MARINA INCUnderground Storage Tanks · 1200 ft
- RIVERS RUNUnderground Storage Tanks · 1500 ft
- LOST SPRINGS DEVELOPMENT CORPORATIONUnderground Storage Tanks · 1600 ft
- OR STATE HWY 2-3 DETROITUnderground Storage Tanks · 0.7 mi
- DETROIT LAKE STATE PARKUnderground Storage Tanks · 1.2 mi
- IDANHA CARDLOCKUnderground Storage Tanks · 2.4 mi
- REASONABLE RICHARDSUnderground Storage Tanks · 4.1 mi
- USFS DETROIT RANGER DISTRICTUnderground Storage Tanks · 4.2 mi
- COE CIVIL GREEN PETER DAMSuperfund · 4.8 mi
- COE CIVIL DETROIT DAMSuperfund · 4.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Detroit'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 Detroit.
Total Sites
49
within ~10 miles of Detroit
Risk Level
Elevated
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Detroit
Severity Distribution
within ~10 miles of Detroit
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Detroit, two things run higher than the national average within ~10 miles of Detroit — Superfund (6 sites) and Mining (24 sites). That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Detroit
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 Detroit average
Your land is one point inside Detroit
Everything above resolves to Detroit as a whole — one PHZM band and one 28°F frost record, read across 375 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 Detroit Average
Detroit Average
- ●USDA Zones 8b, averaged across Detroit
- ●One soil character for all of Detroit
- ●Frost dates read at Detroit's scale: Mar 31 to Nov 17
YOUR Parcel
- ✓Your exact zone, not Detroit's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Detroit
Pull a site-specific report for your exact address in Detroit, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Detroit averages can't show:
We read public map data around Detroit — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Detroit average
How we know this about Detroit
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 Detroit’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 Detroit
When does frost risk typically end in Detroit?
The last hard freeze (28°F) in Detroit typically lands around Mar 31, 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 Apr 21.
When is the first frost in Detroit?
The first hard freeze (28°F) in Detroit typically arrives around Nov 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 3, so the watching starts about Oct 18 — about 231 days after the spring freeze cleared.
How long is the growing season in Detroit?
Measured between 28°F hard freezes, Detroit sees about 231 frost-free days — roughly Mar 31 through Nov 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Nov 3, about 196 days.
Is the soil safe to grow vegetables in Detroit?
The federal record around Detroit is a meaningful one — 49 documented sites, mostly Mining entries (24), the nearest Underground Storage Tanks record under a tenth of a mile 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 Detroit?
From about Oct 18 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 17 (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 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Detroit's scale — its 8b band and its 231-day season. Your yard writes its own version of Detroit'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 Detroit’s own scale
6 of the readings below were taken at Detroit's own scale — its own ~231-day season between 28°F freezes, the 375 acres it covers and 49 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Detroit's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Detroit's own 28°F hard-freeze dates, about Mar 31 and Nov 17 and the ~231-day span between themNOAA 1991–2020 Climate Normals
- 49 documented contamination sites on the federal record near Detroit, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Detroit's boundary and the 375 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~231-day seasonGrowable Ground crop-matching engine
- Detroit sits in the Cascades — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Detroit's 375 acres read through its county's SSURGO summaryfrom Marion County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Marion County
- The growing challenges every Oregon grower plans around — written at state scale, so they stay on the state guidefrom Oregon
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Marion County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Detroit's 375 acreswhy one lot differs from the next →
- Which side of Detroit you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 375 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Detroit-wide figureread your own land →