Cliffdell, Washington, sits in USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
The conditions favor cabbage, blackberry, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Cliffdell, 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 Cliffdell 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 Cliffdell — soil, climate, flood, and parcel records. How we handle your address.
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Cliffdell — the short answer
Cliffdell, Washington: USDA zone 6b, about 169 days between hard freezes, across 1K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~169
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 6b is Cliffdell's average, not your lot's — a low corner or a tree line moves it. Against Cliffdell's 169-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cliffdell
Each reading below is measured for Cliffdell itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCliffdell runs about 169 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
MeasuredCliffdell sits in USDA hardiness zone 6b.
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 Cliffdell is in
Cliffdell sits in the Eastern Cascades Slopes and Foothills — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Cliffdell's own centroid, and it is not what its county reads: Yakima County is mostly Columbia Plateau. The wider page above you is answering a different question about different ground.
What Grows in Cliffdell
Every plant below cleared Cliffdell's own zone 6b and its 169-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Cliffdell?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 11 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Cliffdell
Closest first, within ~10 miles of Cliffdell. Listing isn't leaking, and distance isn't exposure.
- GOLD RUN STEAK OUTUnderground Storage Tanks · 0.7 mi
- CHINOOK PASS WORK CENTERUnderground Storage Tanks · 1.0 mi
- 16N/14E-01F02Nitrate · 1.2 mi
- WA DOT COTTONWOOD MAINTENANCEUnderground Storage Tanks · 1.5 mi
- DOUGLAS R WILLIAMS & KRISTINE WILLIAMSUnderground Storage Tanks · 1.6 mi
- 16N/14E-01J01Nitrate · 1.8 mi
- 16N/14E-01R01Nitrate · 1.9 mi
- POND CAFEUnderground Storage Tanks · 2.6 mi
- USDA USFS R06 CHINOOK PASS WORK CTRSuperfund · 2.8 mi
- Pita at Squaw Rock RV ResortUnderground Storage Tanks · 3.7 mi
- 17N/14E-09K01Nitrate · 4.4 mi
- 17N/13E-12K01Nitrate · 6.7 mi
5 more sites are on the record inside the same radius. See them on the map
Measured from Cliffdell'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 Cliffdell.
Total Sites
24
within ~10 miles of Cliffdell
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Cliffdell
Severity Distribution
within ~10 miles of Cliffdell
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •A Superfund listing means federally documented contamination. Test soil and water before planting edibles nearby.
Check your specific parcel in Cliffdell
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 Cliffdell average
Your land is one point inside Cliffdell
Everything above resolves to Cliffdell as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Cliffdell Average
Cliffdell Average
- ●USDA Zones 6b, averaged across Cliffdell
- ●One soil character for all of Cliffdell
- ●Frost dates read at Cliffdell's scale: Apr 25 to Oct 11
YOUR Parcel
- ✓Your exact zone, not Cliffdell's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cliffdell
Pull a site-specific report for your exact address in Cliffdell, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cliffdell averages can't show:
We read public map data around Cliffdell — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cliffdell average
How we know this about Cliffdell
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 Cliffdell’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 Cliffdell
When does frost risk typically end in Cliffdell?
The last hard freeze (28°F) in Cliffdell typically lands around Apr 25, 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 16.
When is the first frost in Cliffdell?
The first hard freeze (28°F) in Cliffdell typically arrives around Oct 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 27, so the watching starts about Sep 11 — about 169 days after the spring freeze cleared.
How long is the growing season in Cliffdell?
Measured between 28°F hard freezes, Cliffdell sees about 169 frost-free days — roughly Apr 25 through Oct 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 16 to Sep 27, about 134 days.
Is the soil safe to grow vegetables in Cliffdell?
The federal record around Cliffdell is a meaningful one — 24 documented sites, mostly Nitrate entries (14), the nearest Underground Storage Tanks record about 0.7 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 Cliffdell?
From about Sep 11 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 Oct 11 (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 Oct 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cliffdell's scale — its 6b band and its 169-day season. Your yard writes its own version of Cliffdell'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 Cliffdell’s own scale
6 of the readings below were taken at Cliffdell's own scale — its own ~169-day season between 28°F freezes, the 1,180 acres it covers and 24 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cliffdell's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Cliffdell's own 28°F hard-freeze dates, about Apr 25 and Oct 11 and the ~169-day span between themNOAA 1991–2020 Climate Normals
- 24 documented contamination sites on the federal record near Cliffdell, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Cliffdell's boundary and the 1,180 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~169-day seasonGrowable Ground crop-matching engine
- Cliffdell sits in the Eastern Cascades Slopes and Foothills — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cliffdell's 1,180 acres read through its county's SSURGO summaryfrom Yakima County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Yakima 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 Yakima County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cliffdell's 1,180 acreswhy one lot differs from the next →
- Which side of Cliffdell you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,180 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 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 Cliffdell-wide figureread your own land →