Tumwater, Washington, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with kale, potato, garlic, and western red cedar — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Tumwater, 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 Tumwater 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 Tumwater — soil, climate, flood, and parcel records. How we handle your address.
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Tumwater — the short answer
Tumwater, Washington: USDA zone 8b, about 227 days between hard freezes, across 11K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 28
- Thurston County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 10
- Thurston County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~227
- Thurston County normal — NOAA 1991–2020, nearest to this town
- City area
- 11K 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 Thurston County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Tumwater's average, not your lot's — a low corner or a tree line moves it. Against Tumwater's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Tumwater
Each reading below is measured for Tumwater itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsTumwater runs about 227 days between hard freezes (read from Thurston County, the closest normal to Tumwater) — 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
MeasuredTumwater 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 Tumwater is in
Tumwater sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Tumwater's own centroid rather than borrowed from Thurston County.
What Grows in Tumwater
Plants matched to Tumwater's USDA zones 8b, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Tumwater?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Tumwater
Closest first, within ~10 miles of Tumwater. Listing isn't leaking, and distance isn't exposure.
- HOME DEPOT STORE 4724Brownfields · 1200 ft
- BLACK HILLS DISTRIBUTINGUnderground Storage Tanks · 1700 ft
- TUMWATER SCHOOL DISTRICT 33Underground Storage Tanks · 1800 ft
- UNITED RENTALS NORTHWEST INC TUMWATERUnderground Storage Tanks · 2000 ft
- ConnellyNitrate · 2000 ft
- WALMART SUPERCENTER 3850Brownfields · 2000 ft
- SYGITOWICZ AUTO SERVICEUnderground Storage Tanks · 2200 ft
- LABOR & INDUSTRIES BLDGUnderground Storage Tanks · 2400 ft
- CITY OF TUMWATERUnderground Storage Tanks · 2500 ft
- TUMWATER FIRE DEPARTMENTBrownfields · 2500 ft
- COSTCO WHOLESALE #64Underground Storage Tanks · 2500 ft
- CONTINENTAL BAKING CO TUMWATERUnderground Storage Tanks · 2600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Tumwater'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 Tumwater.
Sources Checked
within ~10 miles of Tumwater
Severity Distribution
within ~10 miles of Tumwater
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Tumwater, PFAS runs higher than the national average — 11 sites within ~10 miles of Tumwater. That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Tumwater
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 Tumwater average
Your land is one point inside Tumwater
Everything above resolves to Tumwater as a whole — one PHZM band, read across 11K acres, with hard-freeze dates borrowed from Thurston 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 Tumwater Average
Tumwater Average
- ●USDA Zones 8b, averaged across Tumwater
- ●One soil character for all of Tumwater
- ●Frost dates read at Tumwater's scale: Mar 28 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Tumwater's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Tumwater
Pull a site-specific report for your exact address in Tumwater, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Tumwater averages can't show:
We read public map data around Tumwater — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Tumwater average
How we know this about Tumwater
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 Thurston 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 Tumwater
When does frost risk typically end in Tumwater?
The last hard freeze (28°F) in Tumwater typically lands around Mar 28, 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 18.
When is the first frost in Tumwater?
The first hard freeze (28°F) in Tumwater typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 227 days after the spring freeze cleared.
How long is the growing season in Tumwater?
Measured between 28°F hard freezes, Tumwater sees about 227 frost-free days — roughly Mar 28 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Oct 27, about 192 days.
Is the soil safe to grow vegetables in Tumwater?
The federal record around Tumwater is a meaningful one — 777 documented sites, mostly Underground Storage Tanks entries (434), the nearest Brownfields record about 0.2 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 Tumwater?
From about Oct 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 Nov 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Tumwater's scale — its 8b band and its 227-day season. Your yard writes its own version of Tumwater'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 Tumwater’s own scale
4 of the readings below were taken at Tumwater's own scale — the 11,356 acres it covers and 777 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Tumwater's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 777 documented contamination sites on the federal record near Tumwater, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Tumwater's boundary and the 11,356 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Tumwater's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Tumwater has no normal of its own, so its county's is the closest measured readfrom Thurston County
- Soil character — no town-scale survey exists, so Tumwater's 11,356 acres read through its county's SSURGO summaryfrom Thurston County
- The candidate plant list — Washington's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom Washington
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Thurston 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 Thurston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Tumwater's 11,356 acreswhy one lot differs from the next →
- Which side of Tumwater you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 11,356 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Tumwater-wide figureread your own land →