Winlock, Washington, sits in USDA hardiness zone 8a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
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 Winlock, 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 Winlock 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 Winlock — soil, climate, flood, and parcel records. How we handle your address.
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Winlock — the short answer
Winlock, Washington: USDA zone 8a, about 243 days between hard freezes, across 2K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 22
- Lewis County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 20
- Lewis County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~243
- Lewis County normal — NOAA 1991–2020, nearest to this town
- City area
- 2K 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 Lewis County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8a is Winlock's average, not your lot's — a low corner or a tree line moves it. Against Winlock's 243-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Winlock
Each reading below is measured for Winlock itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsWinlock runs about 243 days between hard freezes (read from Lewis County, the closest normal to Winlock) — 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
MeasuredWinlock sits in USDA hardiness zone 8a.
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 Winlock is in
Winlock sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Winlock's own centroid, and it is not what its county reads: Lewis County is mostly Cascades. The wider page above you is answering a different question about different ground.
What Grows in Winlock
Every plant below cleared Winlock's own zone 8a and its 243-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Winlock?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Winlock
Closest first, within ~10 miles of Winlock. Listing isn't leaking, and distance isn't exposure.
- LEWIS J SHOOK-SHOOK'S DRILLINGUnderground Storage Tanks · 750 ft
- WA DOT TOLEDO MAINTENANCEUnderground Storage Tanks · 1500 ft
- LAKE TRASK TIMBER TRAILS ASSO INCUnderground Storage Tanks · 1900 ft
- WINLOCK SHELL SUBS AND MOREUnderground Storage Tanks · 2000 ft
- 12N/02W-27J01Nitrate · 2300 ft
- NW MARINE TRANSPORT INC WINLOCKBrownfields · 0.5 mi
- HILLCREST XII 377Underground Storage Tanks · 0.8 mi
- ACE HARDWAREUnderground Storage Tanks · 0.9 mi
- FRED SHELLUnderground Storage Tanks · 1.0 mi
- VANGUARD PROPERTIES-COWLITZ MILLUnderground Storage Tanks · 1.0 mi
- ALASKAN CAMPERSToxics Release Inventory · 1.0 mi
- HANDI STOREUnderground Storage Tanks · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Winlock'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 Winlock.
Sources Checked
within ~10 miles of Winlock
Severity Distribution
within ~10 miles of Winlock
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Winlock, Nitrate runs higher than the national average — 294 sites within ~10 miles of Winlock. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Winlock
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 Winlock average
Your land is one point inside Winlock
Everything above resolves to Winlock as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Lewis County’s record because no 30-year normal resolves at this city’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 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 Winlock Average
Winlock Average
- ●USDA Zones 8a, averaged across Winlock
- ●One soil character for all of Winlock
- ●Frost dates read at Winlock's scale: Mar 22 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Winlock's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Winlock
Pull a site-specific report for your exact address in Winlock, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Winlock averages can't show:
We read public map data around Winlock — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Winlock average
How we know this about Winlock
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 Lewis 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 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 Winlock
When does frost risk typically end in Winlock?
The last hard freeze (28°F) in Winlock typically lands around Mar 22, 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 12.
When is the first frost in Winlock?
The first hard freeze (28°F) in Winlock typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 243 days after the spring freeze cleared.
How long is the growing season in Winlock?
Measured between 28°F hard freezes, Winlock sees about 243 frost-free days — roughly Mar 22 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 12 to Nov 6, about 208 days.
Is the soil safe to grow vegetables in Winlock?
The federal record around Winlock is a meaningful one — 410 documented sites, mostly Nitrate entries (294), the nearest Underground Storage Tanks record about 0.1 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 Winlock?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Winlock's scale — its 8a band and its 243-day season. Your yard writes its own version of Winlock'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 Winlock’s own scale
5 of the readings below were taken at Winlock's own scale — the 2,164 acres it covers and 410 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Winlock's own USDA hardiness band, zones 8aUSDA PHZM 2023
- 410 documented contamination sites on the federal record near Winlock, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Winlock's boundary and the 2,164 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~243-day seasonGrowable Ground crop-matching engine
- Winlock 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 — Winlock has no normal of its own, so its county's is the closest measured readfrom Lewis County
- Soil character — no town-scale survey exists, so Winlock's 2,164 acres read through its county's SSURGO summaryfrom Lewis County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lewis 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 Lewis County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Winlock's 2,164 acreswhy one lot differs from the next →
- Which side of Winlock you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,164 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Winlock-wide figureread your own land →
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