Riverbend, Washington, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Riverbend, 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 Riverbend 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 Riverbend — soil, climate, flood, and parcel records. How we handle your address.
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Riverbend — the short answer
Riverbend, Washington: USDA zone 8b, about 269 days between hard freezes, across 2K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~269
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Riverbend's average, not your lot's — a low corner or a tree line moves it. Against Riverbend's 269-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Riverbend
Each reading below is measured for Riverbend itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRiverbend runs about 269 days between hard freezes — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredRiverbend 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 Riverbend is in
Riverbend sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Riverbend's own centroid rather than borrowed from King County.
What Grows in Riverbend
Every plant below cleared Riverbend's own zone 8b and its 269-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Riverbend?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Jan 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 23 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Riverbend
Closest first, within ~10 miles of Riverbend. Listing isn't leaking, and distance isn't exposure.
- CASCADE GOLF COURSEUnderground Storage Tanks · 0.7 mi
- IRON HORSE PARKUnderground Storage Tanks · 0.8 mi
- MC ANDERSON TRUCKINGUnderground Storage Tanks · 0.8 mi
- PUGET SOUND POWER & LIGHT COUnderground Storage Tanks · 0.8 mi
- TANNER ELECTRIC COOPERATIVEUnderground Storage Tanks · 1.2 mi
- 23N/08E-15P02Nitrate · 1.2 mi
- CEDAR FALLS DROP BOX SITEBrownfields · 1.2 mi
- NORTH BEND RANGER STNUnderground Storage Tanks · 1.4 mi
- HPT TA PROPERTIES TRUSTUnderground Storage Tanks · 1.6 mi
- WARRIOR'S QUICK STOP 2Underground Storage Tanks · 1.7 mi
- PETROCARD INCUnderground Storage Tanks · 1.7 mi
- FRANK PADAVICHUnderground Storage Tanks · 1.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Riverbend'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 Riverbend.
Total Sites
103
within ~10 miles of Riverbend
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Riverbend
Severity Distribution
within ~10 miles of Riverbend
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Riverbend, two things run higher than the national average within ~10 miles of Riverbend — PFAS (4 sites) and Mining (7 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.
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 irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Riverbend
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 Riverbend average
Your land is one point inside Riverbend
Everything above resolves to Riverbend as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Riverbend Average
Riverbend Average
- ●USDA Zones 8b, averaged across Riverbend
- ●One soil character for all of Riverbend
- ●Frost dates read at Riverbend's scale: Feb 27 to Nov 23
YOUR Parcel
- ✓Your exact zone, not Riverbend's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Riverbend
Pull a site-specific report for your exact address in Riverbend, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Riverbend averages can't show:
We read public map data around Riverbend — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Riverbend average
How we know this about Riverbend
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 Riverbend’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 Riverbend
When does frost risk typically end in Riverbend?
The last hard freeze (28°F) in Riverbend typically lands around Feb 27, 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 20.
When is the first frost in Riverbend?
The first hard freeze (28°F) in Riverbend typically arrives around Nov 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 9, so the watching starts about Oct 24 — about 269 days after the spring freeze cleared.
How long is the growing season in Riverbend?
Measured between 28°F hard freezes, Riverbend sees about 269 frost-free days — roughly Feb 27 through Nov 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 20 to Nov 9, about 234 days.
Is the soil safe to grow vegetables in Riverbend?
The federal record around Riverbend is a meaningful one — 103 documented sites, mostly Underground Storage Tanks entries (64), 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 Riverbend?
From about Oct 24 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Riverbend's scale — its 8b band and its 269-day season. Your yard writes its own version of Riverbend'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 Riverbend’s own scale
6 of the readings below were taken at Riverbend's own scale — its own ~269-day season between 28°F freezes, the 1,910 acres it covers and 103 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Riverbend's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Riverbend's own 28°F hard-freeze dates, about Feb 27 and Nov 23 and the ~269-day span between themNOAA 1991–2020 Climate Normals
- 103 documented contamination sites on the federal record near Riverbend, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Riverbend's boundary and the 1,910 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~269-day seasonGrowable Ground crop-matching engine
- The ecoregion at Riverbend's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Riverbend's 1,910 acres read through its county's SSURGO summaryfrom King County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom King 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 King County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Riverbend's 1,910 acreswhy one lot differs from the next →
- Which side of Riverbend you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,910 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 Riverbend-wide figureread your own land →
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