Pomeroy, Washington, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, pawpaw, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Pomeroy, 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 Pomeroy 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 Pomeroy — soil, climate, flood, and parcel records. How we handle your address.
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Pomeroy — the short answer
Pomeroy, Washington: USDA zone 7a, about 192 days between hard freezes, across 1K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~192
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 Pomeroy's average, not your lot's — a low corner or a tree line moves it. Against Pomeroy's 192-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Pomeroy
Each reading below is measured for Pomeroy itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPomeroy runs about 192 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredPomeroy 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 Pomeroy is in
Pomeroy sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Pomeroy's own centroid rather than borrowed from Garfield County.
What Grows in Pomeroy
Every plant below cleared Pomeroy's own zone 7a and its 192-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Pomeroy?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 23 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Pomeroy
Closest first, within ~10 miles of Pomeroy. Listing isn't leaking, and distance isn't exposure.
- POMEROY SCHOOL DISTRICTUnderground Storage Tanks · 550 ft
- 12N/42E-31L01 PAS14Nitrate · 1300 ft
- FARM & HOME SUPPLYBrownfields · 1500 ft
- FISCHER AUTO REPAIRUnderground Storage Tanks · 1500 ft
- RICHS EXXON SERVICEUnderground Storage Tanks · 1600 ft
- GAS N GOUnderground Storage Tanks · 1800 ft
- POMEROY CITY OFUnderground Storage Tanks · 1900 ft
- GARFIELD CO MEMORIAL HOSPITALUnderground Storage Tanks · 1900 ft
- COLEMAN OIL COMPANYUnderground Storage Tanks · 2500 ft
- ABLE AUTOMOTIVE INCUnderground Storage Tanks · 2500 ft
- 11N/42E-05C01 PAS13Nitrate · 0.6 mi
- WALDHER OIL COMPANYUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Pomeroy'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 Pomeroy.
Sources Checked
within ~10 miles of Pomeroy
Severity Distribution
within ~10 miles of Pomeroy
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Pomeroy, Underground Storage Tanks runs higher than the national average — 35 sites within ~10 miles of Pomeroy. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Pomeroy
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 Pomeroy average
Your land is one point inside Pomeroy
Everything above resolves to Pomeroy as a whole — one PHZM band and one 28°F frost record, read across 1K 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 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 Pomeroy Average
Pomeroy Average
- ●USDA Zones 7a, averaged across Pomeroy
- ●One soil character for all of Pomeroy
- ●Frost dates read at Pomeroy's scale: Apr 14 to Oct 23
YOUR Parcel
- ✓Your exact zone, not Pomeroy's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Pomeroy
Pull a site-specific report for your exact address in Pomeroy, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Pomeroy averages can't show:
We read public map data around Pomeroy — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Pomeroy average
How we know this about Pomeroy
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 Pomeroy’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 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 Pomeroy
When does frost risk typically end in Pomeroy?
The last hard freeze (28°F) in Pomeroy typically lands around Apr 14, 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 May 5.
When is the first frost in Pomeroy?
The first hard freeze (28°F) in Pomeroy typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 192 days after the spring freeze cleared.
How long is the growing season in Pomeroy?
Measured between 28°F hard freezes, Pomeroy sees about 192 frost-free days — roughly Apr 14 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 9, about 157 days.
Is the soil safe to grow vegetables in Pomeroy?
The federal record around Pomeroy is light — 41 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (35), the nearest Underground Storage Tanks record about 0.1 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Pomeroy?
From about Sep 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 Oct 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Pomeroy's scale — its 7a band and its 192-day season. Your yard writes its own version of Pomeroy'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 Pomeroy’s own scale
6 of the readings below were taken at Pomeroy's own scale — its own ~192-day season between 28°F freezes, the 1,137 acres it covers and 41 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Pomeroy's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Pomeroy's own 28°F hard-freeze dates, about Apr 14 and Oct 23 and the ~192-day span between themNOAA 1991–2020 Climate Normals
- 41 documented contamination sites on the federal record near Pomeroy, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Pomeroy's boundary and the 1,137 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~192-day seasonGrowable Ground crop-matching engine
- The ecoregion at Pomeroy's own centroid, the Columbia PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Pomeroy's 1,137 acres read through its county's SSURGO summaryfrom Garfield County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Garfield 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 Garfield County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Pomeroy's 1,137 acreswhy one lot differs from the next →
- Which side of Pomeroy you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,137 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 Pomeroy-wide figureread your own land →
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