Grand Mound, Washington, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
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 Grand Mound, 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 Grand Mound 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 Grand Mound — soil, climate, flood, and parcel records. How we handle your address.
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Grand Mound — the short answer
Grand Mound, Washington: USDA zone 8b, about 227 days between hard freezes, across 3K acres of town.
- 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
- Town area
- 3K 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 Grand Mound's average, not your lot's — a low corner or a tree line moves it. Against Grand Mound's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grand Mound
Each reading below is measured for Grand Mound itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsGrand Mound runs about 227 days between hard freezes (read from Thurston County, the closest normal to Grand Mound) — 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
MeasuredGrand Mound 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 Grand Mound is in
Grand Mound sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Grand Mound's own centroid rather than borrowed from Thurston County.
What Grows in Grand Mound
Plants matched to Grand Mound'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 Grand Mound?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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 Grand Mound
Closest first, within ~10 miles of Grand Mound. Listing isn't leaking, and distance isn't exposure.
- GRAND MOUND CARDLOCKUnderground Storage Tanks · 300 ft
- GRAND MOUND SHELLUnderground Storage Tanks · 650 ft
- ARCO 04469 REGGIE J STAFFORDUnderground Storage Tanks · 800 ft
- SHORT STOP 76Underground Storage Tanks · 1200 ft
- SCMW-3Nitrate · 1200 ft
- SCMW-4Nitrate · 1500 ft
- 15N/03W-11KT04Nitrate · 2500 ft
- JET-STER INCUnderground Storage Tanks · 2500 ft
- EXPRESS IRON WORKSToxics Release Inventory · 0.5 mi
- MARTIN SAND & GRAVEL INCUnderground Storage Tanks · 0.8 mi
- ATLAS CONCRETE PRODUCTS INCUnderground Storage Tanks · 0.9 mi
- 15N/03W-11MT05Nitrate · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Grand Mound'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 Grand Mound.
Sources Checked
within ~10 miles of Grand Mound
Severity Distribution
within ~10 miles of Grand Mound
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Grand Mound, Nitrate runs higher than the national average — 172 sites within ~10 miles of Grand Mound. 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 Grand Mound
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 Grand Mound average
Your land is one point inside Grand Mound
Everything above resolves to Grand Mound as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Thurston County’s record because no 30-year normal resolves at this town’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 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 Grand Mound Average
Grand Mound Average
- ●USDA Zones 8b, averaged across Grand Mound
- ●One soil character for all of Grand Mound
- ●Frost dates read at Grand Mound's scale: Mar 28 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Grand Mound's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grand Mound
Pull a site-specific report for your exact address in Grand Mound, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grand Mound averages can't show:
We read public map data around Grand Mound — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grand Mound average
How we know this about Grand Mound
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 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 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 Grand Mound
When does frost risk typically end in Grand Mound?
The last hard freeze (28°F) in Grand Mound 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 Grand Mound?
The first hard freeze (28°F) in Grand Mound 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 Grand Mound?
Measured between 28°F hard freezes, Grand Mound 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 Grand Mound?
The federal record around Grand Mound is a meaningful one — 430 documented sites, mostly Underground Storage Tanks entries (215), 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 Grand Mound?
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 Grand Mound's scale — its 8b band and its 227-day season. Your yard writes its own version of Grand Mound'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 Grand Mound’s own scale
4 of the readings below were taken at Grand Mound's own scale — the 2,656 acres it covers and 430 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Grand Mound's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 430 documented contamination sites on the federal record near Grand Mound, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Grand Mound's boundary and the 2,656 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Grand Mound's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Grand Mound 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 Grand Mound's 2,656 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 Grand Mound's 2,656 acreswhy one lot differs from the next →
- Which side of Grand Mound you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,656 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 Grand Mound-wide figureread your own land →