Asotin, Washington, sits in USDA hardiness zone 7b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Crops well matched to these conditions include cabbage, prickly pear, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Asotin, 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 Asotin 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 Asotin — soil, climate, flood, and parcel records. How we handle your address.
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Asotin — the short answer
Asotin, Washington: USDA zone 7b, about 246 days between hard freezes, across 687 acres of city.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~246
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 687 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 7b is Asotin's average, not your lot's — a low corner or a tree line moves it. Against Asotin's 246-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Asotin
Each reading below is measured for Asotin itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAsotin runs about 246 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
MeasuredAsotin sits in USDA hardiness zone 7b.
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 Asotin is in
Asotin sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Asotin's own centroid rather than borrowed from Asotin County.
What Grows in Asotin
Every plant below cleared Asotin's own zone 7b and its 246-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Asotin?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 10; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Asotin
Closest first, within ~10 miles of Asotin. Listing isn't leaking, and distance isn't exposure.
- ASOTIN CITY OFUnderground Storage Tanks · 0.5 mi
- 10N/46E-16Q01Nitrate · 0.6 mi
- ASOTIN COUNTY ASOTINUnderground Storage Tanks · 0.7 mi
- CENEX ZIP TRIP #38Underground Storage Tanks · 0.8 mi
- SNAKE RIVER CANYON LODGEUnderground Storage Tanks · 0.9 mi
- 35N 06W 24CCA2Nitrate · 1.6 mi
- FEDERAL CARTRIDGE CO SOUTHPORTBrownfields · 2.2 mi
- FEDERAL CARTRIDGE CO SOUTHPORTToxics Release Inventory · 2.2 mi
- CLEARWATER BULLETSToxics Release Inventory · 2.4 mi
- CLEARWATER BULLETSBrownfields · 2.4 mi
- P. KAY METAL LEWISTON LLCToxics Release Inventory · 2.4 mi
- P. KAY METAL LEWISTON LLCBrownfields · 2.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Asotin'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 Asotin.
Total Sites
336
within ~10 miles of Asotin
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Asotin
Severity Distribution
within ~10 miles of Asotin
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Asotin, two things run higher than the national average within ~10 miles of Asotin — CAFO (4 sites) and Underground Storage Tanks (222 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Asotin
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 Asotin average
Your land is one point inside Asotin
Everything above resolves to Asotin as a whole — one PHZM band and one 28°F frost record, read across 687 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 Asotin Average
Asotin Average
- ●USDA Zones 7b, averaged across Asotin
- ●One soil character for all of Asotin
- ●Frost dates read at Asotin's scale: Mar 10 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Asotin's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Asotin
Pull a site-specific report for your exact address in Asotin, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Asotin averages can't show:
We read public map data around Asotin — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Asotin average
How we know this about Asotin
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 Asotin’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 Asotin
When does frost risk typically end in Asotin?
The last hard freeze (28°F) in Asotin typically lands around Mar 10, 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 31.
When is the first frost in Asotin?
The first hard freeze (28°F) in Asotin typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 246 days after the spring freeze cleared.
How long is the growing season in Asotin?
Measured between 28°F hard freezes, Asotin sees about 246 frost-free days — roughly Mar 10 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 31 to Oct 28, about 211 days.
Is the soil safe to grow vegetables in Asotin?
The federal record around Asotin is a meaningful one — 336 documented sites, mostly Underground Storage Tanks entries (222), the nearest Underground Storage Tanks record about 0.5 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 Asotin?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Asotin's scale — its 7b band and its 246-day season. Your yard writes its own version of Asotin'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 Asotin’s own scale
6 of the readings below were taken at Asotin's own scale — its own ~246-day season between 28°F freezes, the 687 acres it covers and 336 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Asotin's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Asotin's own 28°F hard-freeze dates, about Mar 10 and Nov 11 and the ~246-day span between themNOAA 1991–2020 Climate Normals
- 336 documented contamination sites on the federal record near Asotin, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Asotin's boundary and the 687 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~246-day seasonGrowable Ground crop-matching engine
- The ecoregion at Asotin's own centroid, the Columbia PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Asotin's 687 acres read through its county's SSURGO summaryfrom Asotin County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Asotin 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 Asotin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Asotin's 687 acreswhy one lot differs from the next →
- Which side of Asotin you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 687 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Asotin-wide figureread your own land →