Millersburg, Oregon, sits in USDA hardiness zone 8b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Millersburg, 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 Millersburg 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 Millersburg — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Millersburg — the short answer
Millersburg, Oregon: USDA zone 8b, about 258 days between hard freezes, across 3K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 10
- Linn County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 23
- Linn County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~258
- Linn County normal — NOAA 1991–2020, nearest to this town
- City area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Linn County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Millersburg's average, not your lot's — a low corner or a tree line moves it. Against Millersburg's 258-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Millersburg
Each reading below is measured for Millersburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsMillersburg runs about 258 days between hard freezes (read from Linn County, the closest normal to Millersburg) — 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
MeasuredMillersburg 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 Millersburg is in
Millersburg sits in the Willamette Valley — EPA Level III, inside the wider Marine West Coast Forest. That is read at Millersburg's own centroid, and it is not what its county reads: Linn County is mostly Cascades. The wider page above you is answering a different question about different ground.
What Grows in Millersburg
Every plant below cleared Millersburg's own zone 8b and its 258-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Millersburg?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 10; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 23 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Millersburg
Survey cells within 31 miles of Millersburg checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 481 miles off. What to watch for.
What's on the federal record near Millersburg
Closest first, within ~10 miles of Millersburg. Listing isn't leaking, and distance isn't exposure.
- 10S/03W-21CDBNitrate · 1700 ft
- SRC DIVISION OF ROSSBOROUGH SUPPLY COBrownfields · 2500 ft
- HIGHLINE WARREN, LLC.- ALBANY FACILITYToxics Release Inventory · 0.5 mi
- BOISE CASCADE PLYWOOD PLANTUnderground Storage Tanks · 0.6 mi
- HIGHLINE-WARREN LLCToxics Release Inventory · 0.6 mi
- HIGHLINE-WARREN LLCBrownfields · 0.6 mi
- TRUAX OIL CC #503Underground Storage Tanks · 0.6 mi
- TRUAX OIL INCBrownfields · 0.6 mi
- TOSCO OWNED EQUIPMENT SOUTHERN PACIFIC PROPERTYBrownfields · 0.7 mi
- AMERIGAS PROPANE INCUnderground Storage Tanks · 0.7 mi
- WEYERHAEUSER DISTRIBUTIONToxics Release Inventory · 0.7 mi
- WEYERHAEUSER DISTRIBUTIONBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Millersburg'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 Millersburg.
Sources Checked
within ~10 miles of Millersburg
Severity Distribution
within ~10 miles of Millersburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Millersburg, two things run higher than the national average within ~10 miles of Millersburg — CAFO (4 sites) and Toxics Release Inventory (29 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Millersburg
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 Millersburg average
Your land is one point inside Millersburg
Everything above resolves to Millersburg as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Linn County’s record because no 30-year normal resolves at this city’s own centroid. 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 Millersburg Average
Millersburg Average
- ●USDA Zones 8b, averaged across Millersburg
- ●One soil character for all of Millersburg
- ●Frost dates read at Millersburg's scale: Mar 10 to Nov 23
YOUR Parcel
- ✓Your exact zone, not Millersburg's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Millersburg
Pull a site-specific report for your exact address in Millersburg, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Millersburg averages can't show:
We read public map data around Millersburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Millersburg average
How we know this about Millersburg
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 Linn County’s record, because none resolves here; 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 Millersburg
When does frost risk typically end in Millersburg?
The last hard freeze (28°F) in Millersburg typically lands around Mar 10, 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 Mar 31.
When is the first frost in Millersburg?
The first hard freeze (28°F) in Millersburg typically arrives around Nov 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 9, so the watching starts about Oct 24 — about 258 days after the spring freeze cleared.
How long is the growing season in Millersburg?
Measured between 28°F hard freezes, Millersburg sees about 258 frost-free days — roughly Mar 10 through Nov 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 31 to Nov 9, about 223 days.
Is the soil safe to grow vegetables in Millersburg?
The federal record around Millersburg is a meaningful one — 439 documented sites, mostly Underground Storage Tanks entries (217), the nearest Nitrate 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.
How do I protect my plants from frost in Millersburg?
From about Oct 24 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Millersburg's scale — its 8b band and its 258-day season. Your yard writes its own version of Millersburg'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 Millersburg’s own scale
6 of the readings below were taken at Millersburg's own scale — the 2,651 acres it covers and 439 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Millersburg's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 439 documented contamination sites on the federal record near Millersburg, the closest Nitrate record about 0.3 miles out from the town centreFederal environmental registers
- Millersburg's boundary and the 2,651 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~258-day seasonGrowable Ground crop-matching engine
- Millersburg sits in the Willamette Valley — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around Millersburg checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Millersburg has no normal of its own, so its county's is the closest measured readfrom Linn County
- Soil character — no town-scale survey exists, so Millersburg's 2,651 acres read through its county's SSURGO summaryfrom Linn County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Linn 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 Linn County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Millersburg's 2,651 acreswhy one lot differs from the next →
- Which side of Millersburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,651 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.3 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 Millersburg-wide figureread your own land →