Carlsborg, Washington, sits in USDA hardiness zone 8b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Among the crops suited to this profile: cabbage, fig, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Carlsborg, 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 Carlsborg 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 Carlsborg — soil, climate, flood, and parcel records. How we handle your address.
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Carlsborg — the short answer
Carlsborg, Washington: USDA zone 8b, about 259 days between hard freezes, across 677 acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~259
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 677 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 8b is Carlsborg's average, not your lot's — a low corner or a tree line moves it. Against Carlsborg's 259-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Carlsborg
Each reading below is measured for Carlsborg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCarlsborg runs about 259 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
MeasuredCarlsborg 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 Carlsborg is in
Carlsborg sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Carlsborg's own centroid, and it is not what its county reads: Clallam County is mostly Coast Range. The wider page above you is answering a different question about different ground.
What Grows in Carlsborg
Every plant below cleared Carlsborg's own zone 8b and its 259-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Carlsborg?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 16 — 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 Carlsborg
Closest first, within ~10 miles of Carlsborg. Listing isn't leaking, and distance isn't exposure.
- CLALLAM COUNTY FIRE DISTRICT 3 TRAINING AND OPERATIONS CENTERBrownfields · 900 ft
- CARLSBORG STOREUnderground Storage Tanks · 1200 ft
- ARCO 7096Brownfields · 1600 ft
- MASCO PETROLEUM INC CARLSBORG CFNUnderground Storage Tanks · 1700 ft
- CARLSBORG STATIONUnderground Storage Tanks · 2000 ft
- SEQUIM CHEVRONUnderground Storage Tanks · 2200 ft
- 30N/04W-23C03Nitrate · 2200 ft
- ANJO'S SOILSToxics Release Inventory · 2500 ft
- 30N/04W-15K03Nitrate · 2600 ft
- MARK D SMITHUnderground Storage Tanks · 2600 ft
- 30N/04W-22C02Nitrate · 0.6 mi
- 30N/04W-14L03Nitrate · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Carlsborg'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 Carlsborg.
Total Sites
257
within ~10 miles of Carlsborg
Risk Level
Elevated
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Carlsborg
Severity Distribution
within ~10 miles of Carlsborg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Carlsborg, two things run higher than the national average within ~10 miles of Carlsborg — PFAS (6 sites) and Nitrate (150 sites). That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Carlsborg
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 Carlsborg average
Your land is one point inside Carlsborg
Everything above resolves to Carlsborg as a whole — one PHZM band and one 28°F frost record, read across 677 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 Carlsborg Average
Carlsborg Average
- ●USDA Zones 8b, averaged across Carlsborg
- ●One soil character for all of Carlsborg
- ●Frost dates read at Carlsborg's scale: Mar 2 to Nov 16
YOUR Parcel
- ✓Your exact zone, not Carlsborg's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Carlsborg
Pull a site-specific report for your exact address in Carlsborg, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Carlsborg averages can't show:
We read public map data around Carlsborg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Carlsborg average
How we know this about Carlsborg
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 Carlsborg’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 Carlsborg
When does frost risk typically end in Carlsborg?
The last hard freeze (28°F) in Carlsborg typically lands around Mar 2, 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 23.
When is the first frost in Carlsborg?
The first hard freeze (28°F) in Carlsborg typically arrives around Nov 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 2, so the watching starts about Oct 17 — about 259 days after the spring freeze cleared.
How long is the growing season in Carlsborg?
Measured between 28°F hard freezes, Carlsborg sees about 259 frost-free days — roughly Mar 2 through Nov 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 23 to Nov 2, about 224 days.
Is the soil safe to grow vegetables in Carlsborg?
The federal record around Carlsborg is a meaningful one — 257 documented sites, mostly Nitrate entries (150), the nearest Brownfields record about 0.2 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 Carlsborg?
From about Oct 17 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Carlsborg's scale — its 8b band and its 259-day season. Your yard writes its own version of Carlsborg'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 Carlsborg’s own scale
6 of the readings below were taken at Carlsborg's own scale — its own ~259-day season between 28°F freezes, the 677 acres it covers and 257 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Carlsborg's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Carlsborg's own 28°F hard-freeze dates, about Mar 2 and Nov 16 and the ~259-day span between themNOAA 1991–2020 Climate Normals
- 257 documented contamination sites on the federal record near Carlsborg, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Carlsborg's boundary and the 677 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~259-day seasonGrowable Ground crop-matching engine
- Carlsborg 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 Carlsborg's 677 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 Carlsborg's 677 acreswhy one lot differs from the next →
- Which side of Carlsborg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 677 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Carlsborg-wide figureread your own land →