Olympia, 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.
These conditions suit kale, potato, garlic, and western red cedar — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Olympia, 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 Olympia 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 Olympia — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Olympia — the short answer
Olympia, Washington: USDA zone 8b, about 227 days between hard freezes, across 12K 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
- 12K 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 Olympia's average, not your lot's — a low corner or a tree line moves it. Against Olympia's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Olympia
Each reading below is measured for Olympia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsOlympia runs about 227 days between hard freezes (read from Thurston County, the closest normal to Olympia) — 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
MeasuredOlympia 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 Olympia is in
Olympia sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Olympia's own centroid rather than borrowed from Thurston County.
What Grows in Olympia
Plants matched to Olympia'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 Olympia?
Almost never — the real question is what to plant next. 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. 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 Olympia
Closest first, within ~10 miles of Olympia. Listing isn't leaking, and distance isn't exposure.
- FOREST LAND MGT CENTER CHEM STORAGEUnderground Storage Tanks · 150 ft
- USPS OLYMPIAUnderground Storage Tanks · 250 ft
- PLATINUM ENERGYUnderground Storage Tanks · 850 ft
- FOOD MARTUnderground Storage Tanks · 850 ft
- DARIGOLD INC OLYMPIAUnderground Storage Tanks · 1000 ft
- WA DOL Supply WhseUnderground Storage Tanks · 1000 ft
- PHIL WALL & SONS INCUnderground Storage Tanks · 1100 ft
- ANR FREIGHT SYSTEM OLYMPIAUnderground Storage Tanks · 1100 ft
- OLYMPIA GLASS COUnderground Storage Tanks · 1100 ft
- RAY A LINDSKOGUnderground Storage Tanks · 1200 ft
- Old Sears BuildingUnderground Storage Tanks · 1200 ft
- ABBEY CARPETUnderground Storage Tanks · 1200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Olympia'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 Olympia.
Sources Checked
within ~10 miles of Olympia
Severity Distribution
within ~10 miles of Olympia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Olympia, PFAS runs higher than the national average — 11 sites within ~10 miles of Olympia. 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 Olympia
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 Olympia average
Your land is one point inside Olympia
Everything above resolves to Olympia as a whole — one PHZM band, read across 12K 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 Olympia Average
Olympia Average
- ●USDA Zones 8b, averaged across Olympia
- ●One soil character for all of Olympia
- ●Frost dates read at Olympia's scale: Mar 28 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Olympia's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Olympia
Pull a site-specific report for your exact address in Olympia, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Olympia averages can't show:
We read public map data around Olympia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Olympia average
How we know this about Olympia
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 Olympia
When does frost risk typically end in Olympia?
The last hard freeze (28°F) in Olympia 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 Olympia?
The first hard freeze (28°F) in Olympia 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 Olympia?
Measured between 28°F hard freezes, Olympia 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 Olympia?
The federal record around Olympia is a meaningful one — 771 documented sites, mostly Underground Storage Tanks entries (429), the nearest Underground Storage Tanks record under a tenth of a mile 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 Olympia?
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 Olympia's scale — its 8b band and its 227-day season. Your yard writes its own version of Olympia'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 Olympia’s own scale
4 of the readings below were taken at Olympia's own scale — the 11,661 acres it covers and 771 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Olympia's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 771 documented contamination sites on the federal record near Olympia, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Olympia's boundary and the 11,661 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Olympia's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Olympia 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 Olympia's 11,661 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 Olympia's 11,661 acreswhy one lot differs from the next →
- Which side of Olympia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 11,661 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Olympia-wide figureread your own land →