Dexter, Oregon, sits in USDA hardiness zone 9a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include artichoke, fig, california poppy, and cabbage, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Dexter, 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 Dexter 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 Dexter — soil, climate, flood, and parcel records. How we handle your address.
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Dexter — the short answer
Dexter, Oregon: USDA zone 9a, about 284 days between hard freezes, across 1K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 17
- Lane County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 28
- Lane County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~284
- Lane County normal — NOAA 1991–2020, nearest to this town
- Town 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 Lane County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Dexter's average, not your lot's — a low corner or a tree line moves it. Against Dexter's 284-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dexter
Each reading below is measured for Dexter itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsDexter runs about 284 days between hard freezes (read from Lane County, the closest normal to Dexter) — 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
MeasuredDexter sits in USDA hardiness zone 9a.
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 Dexter is in
Dexter sits in the Willamette Valley — EPA Level III, inside the wider Marine West Coast Forest. That is read at Dexter's own centroid, and it is not what its county reads: Lane County is mostly Cascades. The wider page above you is answering a different question about different ground.
What Grows in Dexter
Every plant below cleared Dexter's own zone 9a and its 284-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Dexter?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Jan 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 28 — 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.
What's on the federal record near Dexter
Closest first, within ~10 miles of Dexter. Listing isn't leaking, and distance isn't exposure.
- MCDOUGAL BROS INCUnderground Storage Tanks · 0.7 mi
- LANE COUNTYUnderground Storage Tanks · 0.9 mi
- DEXTER DAM USACEBrownfields · 1.1 mi
- ON THE WAY, INC.Underground Storage Tanks · 1.2 mi
- ELIJAH BRISTOWUnderground Storage Tanks · 1.4 mi
- Snyder Ranch ArsenicMining · 1.5 mi
- BRIDGE TOWN MARKETUnderground Storage Tanks · 2.2 mi
- LOWELL SCHOOLUnderground Storage Tanks · 2.2 mi
- LOWELL GAS AND GROCERYUnderground Storage Tanks · 2.3 mi
- LOWELL RFPDUnderground Storage Tanks · 2.3 mi
- USFS LOWELL SERVICE CENTER WAREHOUSEUnderground Storage Tanks · 2.3 mi
- USDA FS LOWELL SERVICE CENTER WAREHOUSESuperfund · 2.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dexter'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 Dexter.
Total Sites
80
within ~10 miles of Dexter
Risk Level
Elevated
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Dexter
Severity Distribution
within ~10 miles of Dexter
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dexter, two things run higher than the national average within ~10 miles of Dexter — Superfund (4 sites) and Underground Storage Tanks (55 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Dexter
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 Dexter average
Your land is one point inside Dexter
Everything above resolves to Dexter as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from Lane County’s record because no 30-year normal resolves at this town’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 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 Dexter Average
Dexter Average
- ●USDA Zones 9a, averaged across Dexter
- ●One soil character for all of Dexter
- ●Frost dates read at Dexter's scale: Feb 17 to Nov 28
YOUR Parcel
- ✓Your exact zone, not Dexter's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dexter
Pull a site-specific report for your exact address in Dexter, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dexter averages can't show:
We read public map data around Dexter — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dexter average
How we know this about Dexter
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 Lane 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 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 Dexter
When does frost risk typically end in Dexter?
The last hard freeze (28°F) in Dexter typically lands around Feb 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 Mar 10.
When is the first frost in Dexter?
The first hard freeze (28°F) in Dexter typically arrives around Nov 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 14, so the watching starts about Oct 29 — about 284 days after the spring freeze cleared.
How long is the growing season in Dexter?
Measured between 28°F hard freezes, Dexter sees about 284 frost-free days — roughly Feb 17 through Nov 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 10 to Nov 14, about 249 days.
Is the soil safe to grow vegetables in Dexter?
The federal record around Dexter is a meaningful one — 80 documented sites, mostly Underground Storage Tanks entries (55), the nearest Underground Storage Tanks record about 0.7 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 Dexter?
From about Oct 29 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dexter's scale — its 9a band and its 284-day season. Your yard writes its own version of Dexter'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 Dexter’s own scale
5 of the readings below were taken at Dexter's own scale — the 1,178 acres it covers and 80 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Dexter's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 80 documented contamination sites on the federal record near Dexter, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Dexter's boundary and the 1,178 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~284-day seasonGrowable Ground crop-matching engine
- Dexter sits in the Willamette Valley — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Dexter has no normal of its own, so its county's is the closest measured readfrom Lane County
- Soil character — no town-scale survey exists, so Dexter's 1,178 acres read through its county's SSURGO summaryfrom Lane County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lane 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 Lane County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dexter's 1,178 acreswhy one lot differs from the next →
- Which side of Dexter you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,178 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 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 Dexter-wide figureread your own land →