Ferry County, in Washington, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include cabbage, blackberry, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Ferry County lies within the Inland Northwest (Northeast Washington) — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Ferry County holds more than one microclimate.
Soils and elevations shift across Ferry County, so your frost dates and drainage aren't the county average. 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 Ferry County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Ferry County — the short answer
Ferry County, Washington: USDA zone 6a, about 167 days between hard freezes, across 1.4M acres.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 1
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 15
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~167
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 1.4M acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 6a is Ferry County's average, not your lot's — a low corner or a tree line moves it. Against Ferry County's 167-day season, see what your own ground reads.
Heat in Ferry County
Across a year, Ferry County accumulates about 1,096 growing degree days above 50°F, about 617 fewer than the middle Washington county — ahead of 5 of Washington’s 39 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Ferry County
Across Ferry County, the ground is predominantly Andisols, where Nevine, Togo, and Molson are the most extensive named soil series. The soil is generally well drained with a ashy loam surface. Topsoil pH runs about 6.5–6.7, neutral. Rainfall drains through hydrologic group B soils.
Soil order
Andisols
Drainage
Well drained
Prime farmland
2%
Hydric soils
1%
Soil still varies lot by lot — soil types explained.
How the ground varies across Ferry County
The USDA soil survey maps 87% of Ferry County as well drained — but another 9% drains differently: 4% somewhat excessively drained, 3% moderately well drained.
Nevine is the most extensive named soil at 13% of mapped acres, then Togo (4%) and Molson (4%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Ferry County
Each reading below is measured for Ferry County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Ferry County are well drained, in hydrologic group B — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Ferry County runs about pH 6.5–6.7, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredFerry County runs about 167 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredFerry County sits in USDA hardiness zone 6a.
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 Ferry County is in
Ferry County sits in the Northern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. One consistent ecological setting across the whole county.
What Grows in Ferry County
We scored all 1,086 plants against Ferry County's own USDA zone 6a and its own 167-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Washington profile.
Is it too late to plant in Ferry County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 15 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What gets applied to farmland in Ferry County
USGS estimates 2,178 lb of Glyphosate on Ferry County farmland in 2019, its largest by weight, ahead of Bromoxynil (978 lb) and 2,4-d (673 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Ferry County — and how to grow with it.
We checked the federal record across Ferry County — 536 documented sites across 6 of the 9 source types we track.
The most significant on record: 5 Superfund sites (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Ferry County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Ferry County
Closest first, across Ferry County. Listing isn't leaking, and distance isn't exposure.
- Chief BarnabyMining · 5.7 mi
- Blue JacketMining · 6.3 mi
- Blue HorseMining · 6.4 mi
- Stray DogMining · 6.6 mi
- JunoMining · 6.6 mi
- Silver TipMining · 6.7 mi
- Hall Creek BasinMining · 8.0 mi
- KohlerMining · 9.3 mi
- FERRY COUNTY PUBLIC UTILITY DIST 1Underground Storage Tanks · 9.7 mi
- William Campobasso WellNitrate · 10.0 mi
- Blasher Mica Beryl ProspectMining · 10.0 mi
- Albert HallMining · 12.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Ferry County'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 Ferry County.
Sources Checked
across Ferry County
Severity Distribution
across Ferry County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Ferry County, Mining runs higher than the national average — 445 sites across Ferry County. That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Ferry County
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 Ferry County average
Your land is one point inside Ferry County
Everything above resolves to Ferry County as a whole — one PHZM band and one county frost record, read across 1.4M 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 county 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 county average.
Your Lot vs the Ferry County Average
Ferry County Average
- ●USDA Zones 6a, averaged across Ferry County
- ●One soil character for all of Ferry County
- ●Frost dates read at Ferry County's scale: May 1 to Oct 15
YOUR Parcel
- ✓Your exact zone, not Ferry County's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Ferry County
Pull a site-specific report for your exact address in Ferry County, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ferry County averages can't show:
We read public map data around Ferry County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ferry County average
How we know this about Ferry County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Ferry County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Ferry County
When does frost risk typically end in Ferry County?
The last hard freeze (28°F) in Ferry County typically lands around May 1, 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 May 22.
How long is the growing season in Ferry County?
Measured between 28°F hard freezes, Ferry County sees about 167 frost-free days — roughly May 1 through Oct 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 22 to Oct 1, about 132 days.
Is the soil safe to grow vegetables in Ferry County?
The federal record around Ferry County runs heavier than most — 536 documented sites, mostly Mining entries (445), the nearest Mining record about 5.7 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.
Everything above is measured at Ferry County's scale — its 6a band and its 167-day season. Your yard writes its own version of Ferry County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Washington's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Ferry County’s own scale
8 of the readings below were taken at Ferry County's own scale — its own ~167-day span between 28°F freezes, the 3 most extensive soil series mapped here and 536 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Ferry County's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Ferry County's own 28°F hard-freeze dates and its ~167-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Ferry CountyUSDA NRCS SSURGO
- 536 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Mining record about 5.7 miles outFederal environmental registers
- Ferry County's boundary and the 1,410,066 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~167-day seasonGrowable Ground crop-matching engine
- Ferry County sitting wholly inside the Northern RockiesUS EPA Level III Ecoregions
- Which agricultural compounds go onto Ferry County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Washington grower plans around — written at state scale, so they stay on the state guidefrom Washington
What this page can’t tell you
- How the season shifts across Ferry County — the ~167 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ferry County's 1,410,066 acreswhy one lot differs from the next →
- Which of those 536 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Ferry Countyread your own land →