Grand Ronde, 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 Grand Ronde, 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 Grand Ronde 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 Grand Ronde — soil, climate, flood, and parcel records. How we handle your address.
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Grand Ronde — the short answer
Grand Ronde, Oregon: USDA zone 8b, about 282 days between hard freezes, across 12K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~282
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 12K 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 Grand Ronde's average, not your lot's — a low corner or a tree line moves it. Against Grand Ronde's 282-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grand Ronde
Each reading below is measured for Grand Ronde itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGrand Ronde runs about 282 days between hard freezes — 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
MeasuredGrand Ronde 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 Grand Ronde is in
Grand Ronde sits in the Willamette Valley — EPA Level III, inside the wider Marine West Coast Forest. That is read at Grand Ronde's own centroid rather than borrowed from Polk County.
What Grows in Grand Ronde
Every plant below cleared Grand Ronde's own zone 8b and its 282-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Grand Ronde?
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 Jan 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 25 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
Documented around Grand Ronde
Survey cells within 31 miles of Grand Ronde checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 511 miles off. What to watch for.
What's on the federal record near Grand Ronde
Closest first, within ~10 miles of Grand Ronde. Listing isn't leaking, and distance isn't exposure.
- SPIRIT MOUNTAIN STOREUnderground Storage Tanks · 0.6 mi
- 2-4, GRANDE RONDEUnderground Storage Tanks · 1.1 mi
- ASTRO #500Underground Storage Tanks · 1.1 mi
- MIAMI CORPORATIONUnderground Storage Tanks · 1.2 mi
- 06S/08W-10DDDNitrate · 1.5 mi
- CORRIDOR CAFEUnderground Storage Tanks · 1.8 mi
- SPIRIT MOUNTAIN CASINOPFAS · 1.9 mi
- STRAWBERRY PATCH 27-95-4120Underground Storage Tanks · 2.3 mi
- 06S/07W-08CDBNitrate · 2.4 mi
- VALLEY JUNCTION SERVICEUnderground Storage Tanks · 2.5 mi
- FORT HILL LUMBER COUnderground Storage Tanks · 3.3 mi
- SALMON RIVER PROPERTIESUnderground Storage Tanks · 3.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Grand Ronde'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 Grand Ronde.
Sources Checked
within ~10 miles of Grand Ronde
Severity Distribution
within ~10 miles of Grand Ronde
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Grand Ronde, Toxics Release Inventory runs higher than the national average — 4 sites within ~10 miles of Grand Ronde. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Grand Ronde
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 Grand Ronde average
Your land is one point inside Grand Ronde
Everything above resolves to Grand Ronde as a whole — one PHZM band and one 28°F frost record, read across 12K 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 town 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 Grand Ronde Average
Grand Ronde Average
- ●USDA Zones 8b, averaged across Grand Ronde
- ●One soil character for all of Grand Ronde
- ●Frost dates read at Grand Ronde's scale: Feb 16 to Nov 25
YOUR Parcel
- ✓Your exact zone, not Grand Ronde's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grand Ronde
Pull a site-specific report for your exact address in Grand Ronde, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grand Ronde averages can't show:
We read public map data around Grand Ronde — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grand Ronde average
How we know this about Grand Ronde
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Grand Ronde’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 town grain anywhere on this page — there is no town-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 Grand Ronde
When does frost risk typically end in Grand Ronde?
The last hard freeze (28°F) in Grand Ronde typically lands around Feb 16, 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 9.
When is the first frost in Grand Ronde?
The first hard freeze (28°F) in Grand Ronde typically arrives around Nov 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 11, so the watching starts about Oct 26 — about 282 days after the spring freeze cleared.
How long is the growing season in Grand Ronde?
Measured between 28°F hard freezes, Grand Ronde sees about 282 frost-free days — roughly Feb 16 through Nov 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 9 to Nov 11, about 247 days.
Is the soil safe to grow vegetables in Grand Ronde?
The federal record around Grand Ronde is a meaningful one — 43 documented sites, mostly Underground Storage Tanks entries (23), the nearest Underground Storage Tanks record about 0.6 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 Grand Ronde?
From about Oct 26 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Grand Ronde's scale — its 8b band and its 282-day season. Your yard writes its own version of Grand Ronde'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 Grand Ronde’s own scale
7 of the readings below were taken at Grand Ronde's own scale — its own ~282-day season between 28°F freezes, the 12,286 acres it covers and 43 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Grand Ronde's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Grand Ronde's own 28°F hard-freeze dates, about Feb 16 and Nov 25 and the ~282-day span between themNOAA 1991–2020 Climate Normals
- 43 documented contamination sites on the federal record near Grand Ronde, the closest Underground Storage Tanks record about 0.6 miles out from the town centreFederal environmental registers
- Grand Ronde's boundary and the 12,286 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~282-day seasonGrowable Ground crop-matching engine
- The ecoregion at Grand Ronde's own centroid, the Willamette ValleyUS EPA Level III Ecoregions
- Lanternfly survey cells around Grand Ronde checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Grand Ronde's 12,286 acres read through its county's SSURGO summaryfrom Polk County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Polk 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 Polk County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Grand Ronde's 12,286 acreswhy one lot differs from the next →
- Which side of Grand Ronde you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 12,286 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.6 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 Grand Ronde-wide figureread your own land →