Vernonia, Oregon, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Vernonia, 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 Vernonia 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 Vernonia — soil, climate, flood, and parcel records. How we handle your address.
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Vernonia — the short answer
Vernonia, Oregon: USDA zone 8a, about 262 days between hard freezes, across 1K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 9
- Columbia County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 26
- Columbia County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~262
- Columbia County normal — NOAA 1991–2020, nearest to this town
- City area
- 1K 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 Columbia County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8a is Vernonia's average, not your lot's — a low corner or a tree line moves it. Against Vernonia's 262-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Vernonia
Each reading below is measured for Vernonia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsVernonia runs about 262 days between hard freezes (read from Columbia County, the closest normal to Vernonia) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredVernonia sits in USDA hardiness zone 8a.
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 Vernonia is in
Vernonia sits in the Coast Range — EPA Level III, inside the wider Marine West Coast Forest. That is read at Vernonia's own centroid rather than borrowed from Columbia County.
What Grows in Vernonia
Every plant below cleared Vernonia's own zone 8a and its 262-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Vernonia?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 26 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
Documented around Vernonia
Survey cells within 31 miles of Vernonia checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 563 miles off. What to watch for.
What's on the federal record near Vernonia
Closest first, within ~10 miles of Vernonia. Listing isn't leaking, and distance isn't exposure.
- PUBLIC WORKS SHOPUnderground Storage Tanks · 1800 ft
- VERNONIA SCHOOL DISTRICT 47JBrownfields · 2300 ft
- SVENSEN MARKET LLCUnderground Storage Tanks · 2600 ft
- BUCKNER LAND SALVAGE, INC.Underground Storage Tanks · 0.5 mi
- GTE - VERNONIA CENTRAL OFFICE (5470-B1B)Underground Storage Tanks · 0.5 mi
- LONGVIEW FIBRE COMPANYUnderground Storage Tanks · 0.6 mi
- RILEY'S UNIONUnderground Storage Tanks · 0.6 mi
- WEST OREGON ELECTRIC CO-OPUnderground Storage Tanks · 0.6 mi
- COLUMBIA COUNTY ROAD DEPTUnderground Storage Tanks · 0.7 mi
- RALPH'S SHELL SERVICEUnderground Storage Tanks · 0.8 mi
- BAIR LOGGING CO.Underground Storage Tanks · 0.8 mi
- CHEVRON 206214Brownfields · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Vernonia'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 Vernonia.
Severity Distribution
within ~10 miles of Vernonia
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.
Check your specific parcel in Vernonia
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 Vernonia average
Your land is one point inside Vernonia
Everything above resolves to Vernonia as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from Columbia 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 Vernonia Average
Vernonia Average
- ●USDA Zones 8a, averaged across Vernonia
- ●One soil character for all of Vernonia
- ●Frost dates read at Vernonia's scale: Mar 9 to Nov 26
YOUR Parcel
- ✓Your exact zone, not Vernonia's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Vernonia
Pull a site-specific report for your exact address in Vernonia, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Vernonia averages can't show:
We read public map data around Vernonia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Vernonia average
How we know this about Vernonia
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 Columbia 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 Vernonia
When does frost risk typically end in Vernonia?
The last hard freeze (28°F) in Vernonia typically lands around Mar 9, 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 30.
When is the first frost in Vernonia?
The first hard freeze (28°F) in Vernonia typically arrives around Nov 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 12, so the watching starts about Oct 27 — about 262 days after the spring freeze cleared.
How long is the growing season in Vernonia?
Measured between 28°F hard freezes, Vernonia sees about 262 frost-free days — roughly Mar 9 through Nov 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 30 to Nov 12, about 227 days.
Is the soil safe to grow vegetables in Vernonia?
The federal record around Vernonia is light — 24 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (21), the nearest Underground Storage Tanks record about 0.3 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Vernonia?
From about Oct 27 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Vernonia's scale — its 8a band and its 262-day season. Your yard writes its own version of Vernonia'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 Vernonia’s own scale
6 of the readings below were taken at Vernonia's own scale — the 1,052 acres it covers and 24 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Vernonia's own USDA hardiness band, zones 8aUSDA PHZM 2023
- 24 documented contamination sites on the federal record near Vernonia, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Vernonia's boundary and the 1,052 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~262-day seasonGrowable Ground crop-matching engine
- The ecoregion at Vernonia's own centroid, the Coast RangeUS EPA Level III Ecoregions
- Lanternfly survey cells around Vernonia checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Vernonia has no normal of its own, so its county's is the closest measured readfrom Columbia County
- Soil character — no town-scale survey exists, so Vernonia's 1,052 acres read through its county's SSURGO summaryfrom Columbia County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Columbia 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 Columbia County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Vernonia's 1,052 acreswhy one lot differs from the next →
- Which side of Vernonia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,052 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Vernonia-wide figureread your own land →
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