Clinton, Washington, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, artichoke, fig, california poppy, and cabbage all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Clinton, 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 Clinton 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 Clinton — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Clinton — the short answer
Clinton, Washington: USDA zone 9a, about 292 days between hard freezes, across 648 acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 8
- Island County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 27
- Island County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~292
- Island County normal — NOAA 1991–2020, nearest to this town
- Town area
- 648 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 Island County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Clinton's average, not your lot's — a low corner or a tree line moves it. Against Clinton's 292-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Clinton
Each reading below is measured for Clinton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsClinton runs about 292 days between hard freezes (read from Island County, the closest normal to Clinton) — 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
MeasuredClinton 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 Clinton is in
Clinton sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Clinton's own centroid rather than borrowed from Island County.
What Grows in Clinton
Every plant below cleared Clinton's own zone 9a and its 292-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Clinton?
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 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 27 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Clinton
Closest first, within ~10 miles of Clinton. Listing isn't leaking, and distance isn't exposure.
- WA DOT CLINTON FERRY TERMINALBrownfields · 0.8 mi
- MATTS IMPORT HAVENBrownfields · 1.0 mi
- GORDON SIMMONSUnderground Storage Tanks · 1.0 mi
- CLINTON ORMUnderground Storage Tanks · 1.1 mi
- CLINTON SQUARE GAS & DELIUnderground Storage Tanks · 1.3 mi
- MCCONNELLS BOATHOUSEUnderground Storage Tanks · 2.4 mi
- DEFENSE FUEL SUPPORT POINT MUKILTEOUnderground Storage Tanks · 2.4 mi
- DFSP MUKILTEOUnderground Storage Tanks · 2.4 mi
- MUKILTEO PUBLIC WORKS SHOPUnderground Storage Tanks · 2.6 mi
- USDOD DLA MUKILTEO DEFENSE FUEL SUPPORTSuperfund · 2.6 mi
- MUKILTEO WATER DISTRICT OFFICE TANK 1Underground Storage Tanks · 2.6 mi
- BAILEY'S CORNER STOREUnderground Storage Tanks · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clinton'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 Clinton.
Sources Checked
within ~10 miles of Clinton
Severity Distribution
within ~10 miles of Clinton
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.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Clinton
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 Clinton average
Your land is one point inside Clinton
Everything above resolves to Clinton as a whole — one PHZM band, read across 648 acres, with hard-freeze dates borrowed from Island 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 Clinton Average
Clinton Average
- ●USDA Zones 9a, averaged across Clinton
- ●One soil character for all of Clinton
- ●Frost dates read at Clinton's scale: Feb 8 to Nov 27
YOUR Parcel
- ✓Your exact zone, not Clinton's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Clinton
Pull a site-specific report for your exact address in Clinton, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clinton averages can't show:
We read public map data around Clinton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clinton average
How we know this about Clinton
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 Island 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 Clinton
When does frost risk typically end in Clinton?
The last hard freeze (28°F) in Clinton typically lands around Feb 8, 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 1.
When is the first frost in Clinton?
The first hard freeze (28°F) in Clinton typically arrives around Nov 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 13, so the watching starts about Oct 28 — about 292 days after the spring freeze cleared.
How long is the growing season in Clinton?
Measured between 28°F hard freezes, Clinton sees about 292 frost-free days — roughly Feb 8 through Nov 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 1 to Nov 13, about 257 days.
Is the soil safe to grow vegetables in Clinton?
The federal record around Clinton is a meaningful one — 879 documented sites, mostly Underground Storage Tanks entries (538), the nearest Brownfields record about 0.8 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 Clinton?
From about Oct 28 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Clinton's scale — its 9a band and its 292-day season. Your yard writes its own version of Clinton'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 Clinton’s own scale
5 of the readings below were taken at Clinton's own scale — the 648 acres it covers and 879 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Clinton's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 879 documented contamination sites on the federal record near Clinton, the closest Brownfields record about 0.8 miles out from the town centreFederal environmental registers
- Clinton's boundary and the 648 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~292-day seasonGrowable Ground crop-matching engine
- The ecoregion at Clinton's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Clinton has no normal of its own, so its county's is the closest measured readfrom Island County
- Soil character — no town-scale survey exists, so Clinton's 648 acres read through its county's SSURGO summaryfrom Island County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Island County
- The growing challenges every Washington grower plans around — written at state scale, so they stay on the state guidefrom Washington
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Island County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Clinton's 648 acreswhy one lot differs from the next →
- Which side of Clinton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 648 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.8 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 Clinton-wide figureread your own land →