Uniontown, Washington, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, hazelnut, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Uniontown, 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 Uniontown 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 Uniontown — soil, climate, flood, and parcel records. How we handle your address.
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Uniontown — the short answer
Uniontown, Washington: USDA zone 7a, about 210 days between hard freezes, across 591 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~210
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 591 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 7a is Uniontown's average, not your lot's — a low corner or a tree line moves it. Against Uniontown's 210-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Uniontown
Each reading below is measured for Uniontown itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredUniontown runs about 210 days between hard freezes — 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
MeasuredUniontown sits in USDA hardiness zone 7a.
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 Uniontown is in
Uniontown sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Uniontown's own centroid rather than borrowed from Whitman County.
What Grows in Uniontown
Every plant below cleared Uniontown's own zone 7a and its 210-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Uniontown?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — 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 Uniontown
Closest first, within ~10 miles of Uniontown. Listing isn't leaking, and distance isn't exposure.
- MCGREGOR CO UNION TOWNUnderground Storage Tanks · 750 ft
- 12N/46E-07B02 LE22Nitrate · 1500 ft
- RAY F BAUER INCUnderground Storage Tanks · 1700 ft
- WILBUR-ELLIS COMPANY COLTONBrownfields · 2.8 mi
- WHITMAN COUNTY RD DEPTUnderground Storage Tanks · 2.8 mi
- COLTON SCHOOL DISTRICT NO 306Underground Storage Tanks · 2.9 mi
- GENE SCHULTHEIS FARMS INCUnderground Storage Tanks · 3.3 mi
- JOHNSON UNION WAREHOUSE COMPANYUnderground Storage Tanks · 3.5 mi
- DICK JUTTEUnderground Storage Tanks · 3.5 mi
- ED DRUFFEL FARMS INCUnderground Storage Tanks · 3.5 mi
- LARRY DRUFFEL FARMS INCUnderground Storage Tanks · 3.5 mi
- HAROLD SCHULTHEIS & SONSUnderground Storage Tanks · 3.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Uniontown'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 Uniontown.
Total Sites
249
within ~10 miles of Uniontown
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Uniontown
Severity Distribution
within ~10 miles of Uniontown
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Uniontown, Underground Storage Tanks runs higher than the national average — 171 sites within ~10 miles of Uniontown. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Uniontown
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 Uniontown average
Your land is one point inside Uniontown
Everything above resolves to Uniontown as a whole — one PHZM band and one 28°F frost record, read across 591 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 Uniontown Average
Uniontown Average
- ●USDA Zones 7a, averaged across Uniontown
- ●One soil character for all of Uniontown
- ●Frost dates read at Uniontown's scale: Apr 3 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Uniontown's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Uniontown
Pull a site-specific report for your exact address in Uniontown, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Uniontown averages can't show:
We read public map data around Uniontown — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Uniontown average
How we know this about Uniontown
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 Uniontown’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 Uniontown
When does frost risk typically end in Uniontown?
The last hard freeze (28°F) in Uniontown typically lands around Apr 3, 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 24.
When is the first frost in Uniontown?
The first hard freeze (28°F) in Uniontown typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 210 days after the spring freeze cleared.
How long is the growing season in Uniontown?
Measured between 28°F hard freezes, Uniontown sees about 210 frost-free days — roughly Apr 3 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 16, about 175 days.
Is the soil safe to grow vegetables in Uniontown?
The federal record around Uniontown is a meaningful one — 249 documented sites, mostly Underground Storage Tanks entries (171), 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 Uniontown?
From about Sep 30 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 Oct 30 (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 Oct 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Uniontown's scale — its 7a band and its 210-day season. Your yard writes its own version of Uniontown'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 Uniontown’s own scale
6 of the readings below were taken at Uniontown's own scale — its own ~210-day season between 28°F freezes, the 591 acres it covers and 249 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Uniontown's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Uniontown's own 28°F hard-freeze dates, about Apr 3 and Oct 30 and the ~210-day span between themNOAA 1991–2020 Climate Normals
- 249 documented contamination sites on the federal record near Uniontown, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Uniontown's boundary and the 591 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~210-day seasonGrowable Ground crop-matching engine
- The ecoregion at Uniontown's own centroid, the Columbia PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Uniontown's 591 acres read through its county's SSURGO summaryfrom Whitman County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Whitman 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 Whitman County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Uniontown's 591 acreswhy one lot differs from the next →
- Which side of Uniontown you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 591 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 Uniontown-wide figureread your own land →