Coupeville, Washington, sits in USDA hardiness zone 8b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Coupeville, 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 Coupeville 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 Coupeville — soil, climate, flood, and parcel records. How we handle your address.
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Coupeville — the short answer
Coupeville, Washington: USDA zone 8b, about 292 days between hard freezes, across 813 acres of town.
- USDA zone
- 8b
- 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
- 813 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 8b is Coupeville's average, not your lot's — a low corner or a tree line moves it. Against Coupeville's 292-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Coupeville
Each reading below is measured for Coupeville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsCoupeville runs about 292 days between hard freezes (read from Island County, the closest normal to Coupeville) — 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
MeasuredCoupeville 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 Coupeville is in
Coupeville sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Coupeville's own centroid rather than borrowed from Island County.
What Grows in Coupeville
Every plant below cleared Coupeville's own zone 8b and its 292-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Coupeville?
Almost never — the real question is what to plant next. 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. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near Coupeville
Closest first, within ~10 miles of Coupeville. Listing isn't leaking, and distance isn't exposure.
- COUPEVILLE CITY OFUnderground Storage Tanks · 1700 ft
- MAIN STREET AUTOUnderground Storage Tanks · 1700 ft
- PORT OF COUPEVILLEUnderground Storage Tanks · 1900 ft
- COUPEVILLE MAINTENANCE SHOPUnderground Storage Tanks · 1900 ft
- ISLAND COUNTYUnderground Storage Tanks · 2000 ft
- MARINERS COURT SHOPS R-O-WUnderground Storage Tanks · 2200 ft
- UNOCAL 0138Underground Storage Tanks · 2200 ft
- WHIDBEY ISLAND PUBLIC HOSPITALUnderground Storage Tanks · 2300 ft
- COUPEVILLE CENTRAL OFFICE 2250-B02Underground Storage Tanks · 2600 ft
- WHIDBEYHEALTHBrownfields · 2600 ft
- COUPEVILLE COUNTRY STOREUnderground Storage Tanks · 0.6 mi
- COREY OIL CARDLOCKUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Coupeville'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 Coupeville.
Sources Checked
within ~10 miles of Coupeville
Severity Distribution
within ~10 miles of Coupeville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Coupeville, two things run higher than the national average within ~10 miles of Coupeville — PFAS (6 sites) and Superfund (5 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Coupeville
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 Coupeville average
Your land is one point inside Coupeville
Everything above resolves to Coupeville as a whole — one PHZM band, read across 813 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 Coupeville Average
Coupeville Average
- ●USDA Zones 8b, averaged across Coupeville
- ●One soil character for all of Coupeville
- ●Frost dates read at Coupeville's scale: Feb 8 to Nov 27
YOUR Parcel
- ✓Your exact zone, not Coupeville's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Coupeville
Pull a site-specific report for your exact address in Coupeville, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Coupeville averages can't show:
We read public map data around Coupeville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Coupeville average
How we know this about Coupeville
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 Coupeville
When does frost risk typically end in Coupeville?
The last hard freeze (28°F) in Coupeville 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 Coupeville?
The first hard freeze (28°F) in Coupeville 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 Coupeville?
Measured between 28°F hard freezes, Coupeville 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 Coupeville?
The federal record around Coupeville runs heavier than most — 168 documented sites, mostly Underground Storage Tanks entries (98), the nearest Underground Storage Tanks record about 0.3 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 Coupeville?
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 Coupeville's scale — its 8b band and its 292-day season. Your yard writes its own version of Coupeville'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 Coupeville’s own scale
5 of the readings below were taken at Coupeville's own scale — the 813 acres it covers and 168 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Coupeville's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 168 documented contamination sites on the federal record near Coupeville, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Coupeville's boundary and the 813 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~292-day seasonGrowable Ground crop-matching engine
- The ecoregion at Coupeville's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Coupeville 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 Coupeville's 813 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 Coupeville's 813 acreswhy one lot differs from the next →
- Which side of Coupeville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 813 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Coupeville-wide figureread your own land →