Jamestown, Washington, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Jamestown, 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 Jamestown 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 Jamestown — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Jamestown — the short answer
Jamestown, Washington: USDA zone 8b, about 248 days between hard freezes, across 373 acres of town.
- USDA zone
- 8b
- 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
- 373 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 8b is Jamestown's average, not your lot's — a low corner or a tree line moves it. Against Jamestown's 248-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Jamestown
Each reading below is measured for Jamestown itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsJamestown runs about 248 days between hard freezes (read from Clallam County, the closest normal to Jamestown) — 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
MeasuredJamestown 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 Jamestown is in
Jamestown sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Jamestown'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 Jamestown
Every plant below cleared Jamestown's own zone 8b and its 248-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Jamestown?
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. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Jamestown
Closest first, within ~10 miles of Jamestown. Listing isn't leaking, and distance isn't exposure.
- 30N/03W-05H02Nitrate · 2000 ft
- 30N/03W-08B01Nitrate · 0.6 mi
- GRAYMARSH FARMToxics Release Inventory · 0.6 mi
- 30N/03W-06R02Nitrate · 0.9 mi
- 30N/03W-06B01Nitrate · 0.9 mi
- 30N/03W-08M01Nitrate · 1.1 mi
- 30N/04W-01R01Nitrate · 1.5 mi
- 30N/03W-17D02Nitrate · 1.5 mi
- 30N/03W-07Q03Nitrate · 1.6 mi
- 30N/03W-09R01Nitrate · 1.9 mi
- 31N/03W-31E03Nitrate · 1.9 mi
- NASH'SToxics Release Inventory · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Jamestown'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 Jamestown.
Total Sites
241
within ~10 miles of Jamestown
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Jamestown
Severity Distribution
within ~10 miles of Jamestown
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jamestown, two things run higher than the national average within ~10 miles of Jamestown — PFAS (5 sites) and Nitrate (148 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.
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 Jamestown
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 Jamestown average
Your land is one point inside Jamestown
Everything above resolves to Jamestown as a whole — one PHZM band, read across 373 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 Jamestown Average
Jamestown Average
- ●USDA Zones 8b, averaged across Jamestown
- ●One soil character for all of Jamestown
- ●Frost dates read at Jamestown's scale: Mar 15 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Jamestown's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Jamestown
Pull a site-specific report for your exact address in Jamestown, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jamestown averages can't show:
We read public map data around Jamestown — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jamestown average
How we know this about Jamestown
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 Jamestown
When does frost risk typically end in Jamestown?
The last hard freeze (28°F) in Jamestown 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 Jamestown?
The first hard freeze (28°F) in Jamestown 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 Jamestown?
Measured between 28°F hard freezes, Jamestown 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 Jamestown?
The federal record around Jamestown is a meaningful one — 241 documented sites, mostly Nitrate entries (148), the nearest Nitrate record about 0.4 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 Jamestown?
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 Jamestown's scale — its 8b band and its 248-day season. Your yard writes its own version of Jamestown'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 Jamestown’s own scale
5 of the readings below were taken at Jamestown's own scale — the 373 acres it covers and 241 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Jamestown's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 241 documented contamination sites on the federal record near Jamestown, the closest Nitrate record about 0.4 miles out from the town centreFederal environmental registers
- Jamestown's boundary and the 373 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~248-day seasonGrowable Ground crop-matching engine
- Jamestown sits in the Puget Lowland — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Jamestown 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 Jamestown's 373 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 Jamestown's 373 acreswhy one lot differs from the next →
- Which side of Jamestown you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 373 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.4 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 Jamestown-wide figureread your own land →