South Prairie, Washington, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in South Prairie, 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 South Prairie 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 South Prairie — soil, climate, flood, and parcel records. How we handle your address.
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South Prairie — the short answer
South Prairie, Washington: USDA zone 8b, about 271 days between hard freezes, across 245 acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~271
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 245 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 South Prairie's average, not your lot's — a low corner or a tree line moves it. Against South Prairie's 271-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in South Prairie
Each reading below is measured for South Prairie itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSouth Prairie runs about 271 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
MeasuredSouth Prairie 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 South Prairie is in
South Prairie sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at South Prairie's own centroid, and it is not what its county reads: Pierce County is mostly Cascades. The wider page above you is answering a different question about different ground.
What Grows in South Prairie
Every plant below cleared South Prairie's own zone 8b and its 271-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in South Prairie?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 22 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near South Prairie
Closest first, within ~10 miles of South Prairie. Listing isn't leaking, and distance isn't exposure.
- ARNOLD'S GROCERYUnderground Storage Tanks · 1500 ft
- 25N/06E-19H02Nitrate · 0.8 mi
- BUCKLEY WATERPFAS · 1.7 mi
- G & R LOGGING CO INCUnderground Storage Tanks · 1.9 mi
- BURNETT STOREUnderground Storage Tanks · 2.0 mi
- STATION 116Brownfields · 2.0 mi
- TURNA, LLCUnderground Storage Tanks · 2.3 mi
- HI - WAY GROCERYUnderground Storage Tanks · 2.3 mi
- EHE CONSUMABLESBrownfields · 2.3 mi
- LEON'S DELI EXPRESSUnderground Storage Tanks · 2.5 mi
- 214TH AVE E PUMP STATIONUnderground Storage Tanks · 2.5 mi
- 19N/06E-04M01Nitrate · 2.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from South Prairie'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 South Prairie.
Sources Checked
within ~10 miles of South Prairie
Severity Distribution
within ~10 miles of South Prairie
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around South Prairie, two things run higher than the national average within ~10 miles of South Prairie — PFAS (9 sites) and CAFO (9 sites). 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.
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 South Prairie
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 South Prairie average
Your land is one point inside South Prairie
Everything above resolves to South Prairie as a whole — one PHZM band and one 28°F frost record, read across 245 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 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 South Prairie Average
South Prairie Average
- ●USDA Zones 8b, averaged across South Prairie
- ●One soil character for all of South Prairie
- ●Frost dates read at South Prairie's scale: Feb 24 to Nov 22
YOUR Parcel
- ✓Your exact zone, not South Prairie's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in South Prairie
Pull a site-specific report for your exact address in South Prairie, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that South Prairie averages can't show:
We read public map data around South Prairie — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the South Prairie average
How we know this about South Prairie
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 South Prairie’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 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 South Prairie
When does frost risk typically end in South Prairie?
The last hard freeze (28°F) in South Prairie typically lands around Feb 24, 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 17.
When is the first frost in South Prairie?
The first hard freeze (28°F) in South Prairie typically arrives around Nov 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 8, so the watching starts about Oct 23 — about 271 days after the spring freeze cleared.
How long is the growing season in South Prairie?
Measured between 28°F hard freezes, South Prairie sees about 271 frost-free days — roughly Feb 24 through Nov 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 17 to Nov 8, about 236 days.
Is the soil safe to grow vegetables in South Prairie?
The federal record around South Prairie is a meaningful one — 456 documented sites, mostly Underground Storage Tanks entries (272), the nearest Underground Storage Tanks record about 0.3 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 South Prairie?
From about Oct 23 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at South Prairie's scale — its 8b band and its 271-day season. Your yard writes its own version of South Prairie'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 South Prairie’s own scale
6 of the readings below were taken at South Prairie's own scale — its own ~271-day season between 28°F freezes, the 245 acres it covers and 456 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- South Prairie's own USDA hardiness band, zones 8bUSDA PHZM 2023
- South Prairie's own 28°F hard-freeze dates, about Feb 24 and Nov 22 and the ~271-day span between themNOAA 1991–2020 Climate Normals
- 456 documented contamination sites on the federal record near South Prairie, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- South Prairie's boundary and the 245 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~271-day seasonGrowable Ground crop-matching engine
- South Prairie sits in the Puget Lowland — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so South Prairie's 245 acres read through its county's SSURGO summaryfrom Pierce County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pierce 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 Pierce County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among South Prairie's 245 acreswhy one lot differs from the next →
- Which side of South Prairie you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 245 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 South Prairie-wide figureread your own land →
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