Sekiu, Washington, sits in USDA hardiness zone 9a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor artichoke, fig, california poppy, and cabbage, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Sekiu, 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 Sekiu 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 Sekiu — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Sekiu — the short answer
Sekiu, Washington: USDA zone 9a, about 248 days between hard freezes, across 82 acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 15
- Clallam County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 18
- Clallam County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~248
- Clallam County normal — NOAA 1991–2020, nearest to this town
- Town area
- 82 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 Clallam County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Sekiu's average, not your lot's — a low corner or a tree line moves it. Against Sekiu's 248-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sekiu
Each reading below is measured for Sekiu itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSekiu runs about 248 days between hard freezes (read from Clallam County, the closest normal to Sekiu) — 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
MeasuredSekiu 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 Sekiu is in
Sekiu sits in the Coast Range — EPA Level III, inside the wider Marine West Coast Forest. That is read at Sekiu's own centroid rather than borrowed from Clallam County.
What Grows in Sekiu
Every plant below cleared Sekiu's own zone 9a and its 248-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Sekiu?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 18 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Sekiu
Closest first, within ~10 miles of Sekiu. Listing isn't leaking, and distance isn't exposure.
- SEKIU TRADING POSTUnderground Storage Tanks · 750 ft
- OLSON'S RESORTUnderground Storage Tanks · 1300 ft
- WA DOT SEKIU MAINTENANCEUnderground Storage Tanks · 0.7 mi
- COHO RESORTUnderground Storage Tanks · 1.0 mi
- STATE OF WASHINGTON DEPARTMENT OF CORRECTIONSUnderground Storage Tanks · 1.3 mi
- CLALLAM BAY WAREHOUSEUnderground Storage Tanks · 2.1 mi
- ALS MINI MARTUnderground Storage Tanks · 2.1 mi
- MERRILL & RINGUnderground Storage Tanks · 2.1 mi
- BAKERS MINIMARTUnderground Storage Tanks · 2.1 mi
- CAPE FLATTERY SCHOOL DISTRICTUnderground Storage Tanks · 2.1 mi
- CLALLAM BAY CORRECTIONS CENTERBrownfields · 2.1 mi
- HESS MARTUnderground Storage Tanks · 2.2 mi
4 more sites are on the record inside the same radius. See them on the map
Measured from Sekiu'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 Sekiu.
Total Sites
16
within ~10 miles of Sekiu
Risk Level
Low
Highest-severity
2 mining sites (prospects, none worked)
Severity Distribution
within ~10 miles of Sekiu
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Mine waste leaches heavy metals. Test for lead, arsenic and cadmium before growing food here.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Sekiu
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 Sekiu average
Your land is one point inside Sekiu
Everything above resolves to Sekiu as a whole — one PHZM band, read across 82 acres, with hard-freeze dates borrowed from Clallam 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 Sekiu Average
Sekiu Average
- ●USDA Zones 9a, averaged across Sekiu
- ●One soil character for all of Sekiu
- ●Frost dates read at Sekiu's scale: Mar 15 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Sekiu's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sekiu
Pull a site-specific report for your exact address in Sekiu, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sekiu averages can't show:
We read public map data around Sekiu — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sekiu average
How we know this about Sekiu
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 Clallam 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 Sekiu
When does frost risk typically end in Sekiu?
The last hard freeze (28°F) in Sekiu typically lands around Mar 15, 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 5.
When is the first frost in Sekiu?
The first hard freeze (28°F) in Sekiu typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 248 days after the spring freeze cleared.
How long is the growing season in Sekiu?
Measured between 28°F hard freezes, Sekiu sees about 248 frost-free days — roughly Mar 15 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 5 to Nov 4, about 213 days.
Is the soil safe to grow vegetables in Sekiu?
The federal record around Sekiu is light — 16 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (13), the nearest Underground Storage Tanks record about 0.1 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 Sekiu?
From about Oct 19 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 18 (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 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sekiu's scale — its 9a band and its 248-day season. Your yard writes its own version of Sekiu'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 Sekiu’s own scale
5 of the readings below were taken at Sekiu's own scale — the 82 acres it covers and 16 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Sekiu's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 16 documented contamination sites on the federal record near Sekiu, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Sekiu's boundary and the 82 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~248-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sekiu's own centroid, the Coast RangeUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Sekiu has no normal of its own, so its county's is the closest measured readfrom Clallam County
- Soil character — no town-scale survey exists, so Sekiu's 82 acres read through its county's SSURGO summaryfrom Clallam County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Clallam 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 Clallam County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sekiu's 82 acreswhy one lot differs from the next →
- Which side of Sekiu you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 82 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 Sekiu-wide figureread your own land →