Oscoda County, in Michigan, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
These conditions suit cabbage, cranberry, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Oscoda County lies within the Northern Lower Michigan ("Up North") — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Oscoda County holds more than one microclimate.
Soils and elevations shift across Oscoda County, so your frost dates and drainage aren't the county average. 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 Oscoda County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Oscoda County — the short answer
Oscoda County, Michigan: USDA zone 5a, about 151 days between hard freezes, across 362K acres.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 12
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 10
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~151
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 362K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 5a is Oscoda County's average, not your lot's — a low corner or a tree line moves it. Against Oscoda County's 151-day season, see what your own ground reads.
Heat in Oscoda County
Across a year, Oscoda County accumulates about 1,860 growing degree days above 50°F, about 240 fewer than the middle Michigan county — ahead of 30 of Michigan’s 83 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Oscoda County
Across Oscoda County, the ground is predominantly Entisols, where Graycalm, Grayling, and Klacking are the most extensive named soil series. The soil is generally excessively drained with a sand surface. Topsoil pH runs about 4.6–5.5, very strongly acidic. Rainfall drains through hydrologic group A soils.
Soil order
Entisols
Drainage
Excessively drained
Prime farmland
1%
Hydric soils
9%
Soil still varies lot by lot — soil types explained.
How the ground varies across Oscoda County
The USDA soil survey maps 36% of Oscoda County as excessively drained — but another 63% drains differently: 32% somewhat excessively drained, 11% well drained.
Graycalm is the most extensive named soil at 31% of mapped acres, then Grayling (23%) and Klacking (5%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Oscoda County
Each reading below is measured for Oscoda County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Oscoda County are excessively drained, in hydrologic group A — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Oscoda County runs about pH 4.6–5.5, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredOscoda County runs about 151 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
MeasuredOscoda County sits in USDA hardiness zone 5a.
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 Oscoda County is in
Oscoda County sits in the Northern Lakes and Forests — EPA Level III, inside the wider Northern Forests. One consistent ecological setting across the whole county.
What Grows in Oscoda County
We scored all 1,086 plants against Oscoda County's own USDA zone 5a and its own 151-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Michigan profile.
Is it too late to plant in Oscoda County?
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 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 10 — 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.
Documented around Oscoda County
- monarch butterfly36 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Oscoda County
USGS estimates 1,819 lb of Glyphosate on Oscoda County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (1,130 lb) and Metolachlor (637 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Oscoda County — and how to grow with it.
We checked the federal record across Oscoda County — 80 documented sites across 6 of the 9 source types we track.
The most significant on record: 1 Superfund site (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Oscoda County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Oscoda County
Closest first, across Oscoda County. Listing isn't leaking, and distance isn't exposure.
- DWAYNE'S PRECISION COLLISIONBrownfields · 1300 ft
- C & C ServiceUnderground Storage Tanks · 2000 ft
- MI DEPT/TRANSPORTATION BRIDGE B01-68012Brownfields · 2600 ft
- MI DEPT/TRANSPORTATIONBrownfields · 1.0 mi
- Mdot Maintenance GarageUnderground Storage Tanks · 1.0 mi
- Doug Merchant Sawmills, IncUnderground Storage Tanks · 1.1 mi
- HOSKINS MFGToxics Release Inventory · 1.4 mi
- USDA USFS R09 MIO MIBrownfields · 1.7 mi
- UNITED STATES FOREST SERVICEBrownfields · 2.1 mi
- Mio Ranger DistrictUnderground Storage Tanks · 2.2 mi
- AMERICAN COLLISION AND GLASS SHOPBrownfields · 2.2 mi
- Blairs ServiceUnderground Storage Tanks · 2.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Oscoda County'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 Oscoda County.
Total Sites
80
across Oscoda County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Oscoda County
Severity Distribution
across Oscoda County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Oscoda County, PFAS runs higher than the national average — 3 sites across Oscoda County. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Oscoda County
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 Oscoda County average
Your land is one point inside Oscoda County
Everything above resolves to Oscoda County as a whole — one PHZM band and one county frost record, read across 362K 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 county 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 county average.
Your Lot vs the Oscoda County Average
Oscoda County Average
- ●USDA Zones 5a, averaged across Oscoda County
- ●One soil character for all of Oscoda County
- ●Frost dates read at Oscoda County's scale: May 12 to Oct 10
YOUR Parcel
- ✓Your exact zone, not Oscoda County's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Oscoda County
Pull a site-specific report for your exact address in Oscoda County, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Oscoda County averages can't show:
We read public map data around Oscoda County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Oscoda County average
How we know this about Oscoda County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Oscoda County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Oscoda County
When does frost risk typically end in Oscoda County?
The last hard freeze (28°F) in Oscoda County typically lands around May 12, 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 Jun 2.
How long is the growing season in Oscoda County?
Measured between 28°F hard freezes, Oscoda County sees about 151 frost-free days — roughly May 12 through Oct 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 2 to Sep 26, about 116 days.
Is the soil safe to grow vegetables in Oscoda County?
The federal record around Oscoda County is a meaningful one — 80 documented sites, mostly Underground Storage Tanks entries (47), the nearest Brownfields record about 0.3 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.
Everything above is measured at Oscoda County's scale — its 5a band and its 151-day season. Your yard writes its own version of Oscoda County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Michigan's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Oscoda County’s own scale
9 of the readings below were taken at Oscoda County's own scale — its own ~151-day span between 28°F freezes, the 3 most extensive soil series mapped here and 80 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Oscoda County's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Oscoda County's own 28°F hard-freeze dates and its ~151-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Oscoda CountyUSDA NRCS SSURGO
- 80 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 0.3 miles outFederal environmental registers
- Oscoda County's boundary and the 362,031 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~151-day seasonGrowable Ground crop-matching engine
- Oscoda County sitting wholly inside the Northern Lakes and ForestsUS EPA Level III Ecoregions
- Open occurrence records documented in Oscoda County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Oscoda County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Michigan grower plans around — written at state scale, so they stay on the state guidefrom Michigan
What this page can’t tell you
- How the season shifts across Oscoda County — the ~151 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Oscoda County's 362,031 acreswhy one lot differs from the next →
- Which of those 80 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Oscoda Countyread your own land →