Sudden Valley, Washington, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, fig, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Sudden Valley, 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 Sudden Valley 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 Sudden Valley — soil, climate, flood, and parcel records. How we handle your address.
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Sudden Valley — the short answer
Sudden Valley, Washington: USDA zone 8a, about 258 days between hard freezes, across 3K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~258
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 8a is Sudden Valley's average, not your lot's — a low corner or a tree line moves it. Against Sudden Valley's 258-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sudden Valley
Each reading below is measured for Sudden Valley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSudden Valley runs about 258 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
MeasuredSudden Valley sits in USDA hardiness zone 8a.
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 Sudden Valley is in
Sudden Valley sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Sudden Valley's own centroid, and it is not what its county reads: Whatcom County is mostly North Cascades. The wider page above you is answering a different question about different ground.
What Grows in Sudden Valley
Every plant below cleared Sudden Valley's own zone 8a and its 258-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Sudden Valley?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Sudden Valley
Closest first, within ~10 miles of Sudden Valley. Listing isn't leaking, and distance isn't exposure.
- SUDDEN VALLEY RESORTUnderground Storage Tanks · 0.6 mi
- VALLEY MARKET & DELIUnderground Storage Tanks · 1.0 mi
- LAKE WHATCOM RESORTUnderground Storage Tanks · 1.8 mi
- FRANCIS LEE SMALLWOOD TEXACO GASUnderground Storage Tanks · 2.0 mi
- PACIFIC NW GROUP AUnderground Storage Tanks · 2.3 mi
- WA WSP GALBRAITHUnderground Storage Tanks · 2.4 mi
- WHATCOM COUNTY WATER DISTRICT 10Underground Storage Tanks · 2.4 mi
- LOOKOUT MTUnderground Storage Tanks · 2.5 mi
- LOOKOUT MTN/B53K017/LKMTWAQ1650Underground Storage Tanks · 2.6 mi
- LWWSD - SOUTH SHORE WATER SYSTEMPFAS · 2.7 mi
- BELLINGHAM-WATER DIVISION CITY OFPFAS · 2.7 mi
- WHATCOM CNTY PARKS DEPT PLANTATION RIFLEBrownfields · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sudden Valley'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 Sudden Valley.
Sources Checked
within ~10 miles of Sudden Valley
Severity Distribution
within ~10 miles of Sudden Valley
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sudden Valley, two things run higher than the national average within ~10 miles of Sudden Valley — CAFO (7 sites) and Underground Storage Tanks (293 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Sudden Valley
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 Sudden Valley average
Your land is one point inside Sudden Valley
Everything above resolves to Sudden Valley as a whole — one PHZM band and one 28°F frost record, read across 3K 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 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 Sudden Valley Average
Sudden Valley Average
- ●USDA Zones 8a, averaged across Sudden Valley
- ●One soil character for all of Sudden Valley
- ●Frost dates read at Sudden Valley's scale: Mar 7 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Sudden Valley's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sudden Valley
Pull a site-specific report for your exact address in Sudden Valley, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sudden Valley averages can't show:
We read public map data around Sudden Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sudden Valley average
How we know this about Sudden Valley
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 Sudden Valley’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 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 Sudden Valley
When does frost risk typically end in Sudden Valley?
The last hard freeze (28°F) in Sudden Valley typically lands around Mar 7, 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 28.
When is the first frost in Sudden Valley?
The first hard freeze (28°F) in Sudden Valley typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 258 days after the spring freeze cleared.
How long is the growing season in Sudden Valley?
Measured between 28°F hard freezes, Sudden Valley sees about 258 frost-free days — roughly Mar 7 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 28 to Nov 6, about 223 days.
Is the soil safe to grow vegetables in Sudden Valley?
The federal record around Sudden Valley is a meaningful one — 467 documented sites, mostly Underground Storage Tanks entries (293), the nearest Underground Storage Tanks record about 0.6 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 Sudden Valley?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sudden Valley's scale — its 8a band and its 258-day season. Your yard writes its own version of Sudden Valley'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 Sudden Valley’s own scale
6 of the readings below were taken at Sudden Valley's own scale — its own ~258-day season between 28°F freezes, the 2,739 acres it covers and 467 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sudden Valley's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Sudden Valley's own 28°F hard-freeze dates, about Mar 7 and Nov 20 and the ~258-day span between themNOAA 1991–2020 Climate Normals
- 467 documented contamination sites on the federal record near Sudden Valley, the closest Underground Storage Tanks record about 0.6 miles out from the town centreFederal environmental registers
- Sudden Valley's boundary and the 2,739 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~258-day seasonGrowable Ground crop-matching engine
- Sudden Valley sits in the Puget Lowland — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sudden Valley's 2,739 acres read through its county's SSURGO summaryfrom Whatcom County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Whatcom 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 Whatcom County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sudden Valley's 2,739 acreswhy one lot differs from the next →
- Which side of Sudden Valley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,739 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.6 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 Sudden Valley-wide figureread your own land →
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