Jacksonville, Oregon, sits in USDA hardiness zone 8b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Among the crops suited to this profile: cabbage, fig, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Jacksonville, 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 Jacksonville 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 Jacksonville — soil, climate, flood, and parcel records. How we handle your address.
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Jacksonville — the short answer
Jacksonville, Oregon: USDA zone 8b, about 237 days between hard freezes, across 1K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 Jacksonville's average, not your lot's — a low corner or a tree line moves it. Against Jacksonville's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Jacksonville
Each reading below is measured for Jacksonville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredJacksonville runs about 237 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
MeasuredJacksonville 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 Jacksonville is in
Jacksonville sits in the Klamath Mountains/California High North Coast Range — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Jacksonville's own centroid rather than borrowed from Jackson County.
What Grows in Jacksonville
Every plant below cleared Jacksonville's own zone 8b and its 237-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Jacksonville?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 9 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Jacksonville
Closest first, within ~10 miles of Jacksonville. Listing isn't leaking, and distance isn't exposure.
- QWEST CORPORATION dba CENTURYLINK QC (R0Underground Storage Tanks · 750 ft
- RUCH AREAWIDE GROUNDWATER SITESuperfund · 1200 ft
- JACKSONVILLE CHEVRON CIRCLE KUnderground Storage Tanks · 0.8 mi
- 37S/02W-29ACB1Nitrate · 1.1 mi
- OppMining · 1.5 mi
- 38S/02W-06CAA1Nitrate · 1.6 mi
- OSU SOUTHERN OREGON RESEARCH CBrownfields · 2.0 mi
- 37S/02W-34BCD1Nitrate · 2.0 mi
- Town MineMining · 2.0 mi
- Opp MineMining · 2.0 mi
- 37S/02W-27BBC1Nitrate · 2.1 mi
- 37S/02W-20AAC1Nitrate · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Jacksonville'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 Jacksonville.
Total Sites
691
within ~10 miles of Jacksonville
Risk Level
High
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Jacksonville
Severity Distribution
within ~10 miles of Jacksonville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jacksonville, Mining runs higher than the national average — 49 sites within ~10 miles of Jacksonville. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Jacksonville
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 Jacksonville average
Your land is one point inside Jacksonville
Everything above resolves to Jacksonville as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Jacksonville Average
Jacksonville Average
- ●USDA Zones 8b, averaged across Jacksonville
- ●One soil character for all of Jacksonville
- ●Frost dates read at Jacksonville's scale: Mar 17 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Jacksonville's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Jacksonville
Pull a site-specific report for your exact address in Jacksonville, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jacksonville averages can't show:
We read public map data around Jacksonville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jacksonville average
How we know this about Jacksonville
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 Jacksonville’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 Jacksonville
When does frost risk typically end in Jacksonville?
The last hard freeze (28°F) in Jacksonville typically lands around Mar 17, 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 7.
When is the first frost in Jacksonville?
The first hard freeze (28°F) in Jacksonville typically arrives around Nov 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 26, so the watching starts about Oct 10 — about 237 days after the spring freeze cleared.
How long is the growing season in Jacksonville?
Measured between 28°F hard freezes, Jacksonville sees about 237 frost-free days — roughly Mar 17 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 7 to Oct 26, about 202 days.
Is the soil safe to grow vegetables in Jacksonville?
The federal record around Jacksonville runs heavier than most — 691 documented sites, mostly Underground Storage Tanks entries (327), the nearest Underground Storage Tanks record about 0.1 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Jacksonville?
From about Oct 10 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Jacksonville's scale — its 8b band and its 237-day season. Your yard writes its own version of Jacksonville'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 Jacksonville’s own scale
6 of the readings below were taken at Jacksonville's own scale — its own ~237-day season between 28°F freezes, the 1,211 acres it covers and 691 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Jacksonville's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Jacksonville's own 28°F hard-freeze dates, about Mar 17 and Nov 9 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 691 documented contamination sites on the federal record near Jacksonville, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Jacksonville's boundary and the 1,211 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~237-day seasonGrowable Ground crop-matching engine
- The ecoregion at Jacksonville's own centroid, the Klamath Mountains/California High North Coast RangeUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Jacksonville's 1,211 acres read through its county's SSURGO summaryfrom Jackson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jackson 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 Jackson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Jacksonville's 1,211 acreswhy one lot differs from the next →
- Which side of Jacksonville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,211 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Jacksonville-wide figureread your own land →