Snoqualmie, Washington, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Snoqualmie, 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 Snoqualmie 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 Snoqualmie — soil, climate, flood, and parcel records. How we handle your address.
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Snoqualmie — the short answer
Snoqualmie, Washington: USDA zone 8b, about 278 days between hard freezes, across 5K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~278
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 5K 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 Snoqualmie's average, not your lot's — a low corner or a tree line moves it. Against Snoqualmie's 278-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Snoqualmie
Each reading below is measured for Snoqualmie itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSnoqualmie runs about 278 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
MeasuredSnoqualmie 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 Snoqualmie is in
Snoqualmie sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Snoqualmie's own centroid rather than borrowed from King County.
What Grows in Snoqualmie
Every plant below cleared Snoqualmie's own zone 8b and its 278-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Snoqualmie?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 26 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near Snoqualmie
Closest first, within ~10 miles of Snoqualmie. Listing isn't leaking, and distance isn't exposure.
- WALT HAAGUnderground Storage Tanks · 1.0 mi
- GATEWAY GAS & DELIUnderground Storage Tanks · 1.1 mi
- RITE AID 6975 DBA BARTELL DRUGS 075Brownfields · 1.1 mi
- SAFEWAY FUEL #3613Underground Storage Tanks · 1.1 mi
- SAFEWAY 3613Brownfields · 1.1 mi
- SPACELABS HEALTHCAREToxics Release Inventory · 1.1 mi
- MICROCONNEX FORMERLY MICROSOUNDBrownfields · 1.2 mi
- SNOQUALMIE FALLS DEV CORPUnderground Storage Tanks · 1.2 mi
- SALISH LODGEUnderground Storage Tanks · 1.5 mi
- ALCHEMY METAL SPECIALISTSToxics Release Inventory · 1.6 mi
- WA AGR KING 5Brownfields · 1.8 mi
- FALL CITY MARKET LLCUnderground Storage Tanks · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Snoqualmie'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 Snoqualmie.
Total Sites
235
within ~10 miles of Snoqualmie
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Snoqualmie
Severity Distribution
within ~10 miles of Snoqualmie
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Snoqualmie, two things run higher than the national average within ~10 miles of Snoqualmie — PFAS (7 sites) and CAFO (3 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.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Snoqualmie
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 Snoqualmie average
Your land is one point inside Snoqualmie
Everything above resolves to Snoqualmie as a whole — one PHZM band and one 28°F frost record, read across 5K 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 city 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 Snoqualmie Average
Snoqualmie Average
- ●USDA Zones 8b, averaged across Snoqualmie
- ●One soil character for all of Snoqualmie
- ●Frost dates read at Snoqualmie's scale: Feb 21 to Nov 26
YOUR Parcel
- ✓Your exact zone, not Snoqualmie's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Snoqualmie
Pull a site-specific report for your exact address in Snoqualmie, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Snoqualmie averages can't show:
We read public map data around Snoqualmie — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Snoqualmie average
How we know this about Snoqualmie
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Snoqualmie’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 city grain anywhere on this page — there is no city-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 Snoqualmie
When does frost risk typically end in Snoqualmie?
The last hard freeze (28°F) in Snoqualmie typically lands around Feb 21, 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 14.
When is the first frost in Snoqualmie?
The first hard freeze (28°F) in Snoqualmie typically arrives around Nov 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 12, so the watching starts about Oct 27 — about 278 days after the spring freeze cleared.
How long is the growing season in Snoqualmie?
Measured between 28°F hard freezes, Snoqualmie sees about 278 frost-free days — roughly Feb 21 through Nov 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 14 to Nov 12, about 243 days.
Is the soil safe to grow vegetables in Snoqualmie?
The federal record around Snoqualmie is a meaningful one — 235 documented sites, mostly Underground Storage Tanks entries (131), the nearest Underground Storage Tanks record about 1.0 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 Snoqualmie?
From about Oct 27 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Snoqualmie's scale — its 8b band and its 278-day season. Your yard writes its own version of Snoqualmie'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 Snoqualmie’s own scale
6 of the readings below were taken at Snoqualmie's own scale — its own ~278-day season between 28°F freezes, the 4,599 acres it covers and 235 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Snoqualmie's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Snoqualmie's own 28°F hard-freeze dates, about Feb 21 and Nov 26 and the ~278-day span between themNOAA 1991–2020 Climate Normals
- 235 documented contamination sites on the federal record near Snoqualmie, the closest Underground Storage Tanks record about 1.0 miles out from the town centreFederal environmental registers
- Snoqualmie's boundary and the 4,599 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~278-day seasonGrowable Ground crop-matching engine
- The ecoregion at Snoqualmie's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Snoqualmie's 4,599 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 Snoqualmie's 4,599 acreswhy one lot differs from the next →
- Which side of Snoqualmie you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,599 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 1.0 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 Snoqualmie-wide figureread your own land →
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