Kahlotus, 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.
The conditions favor cabbage, hazelnut, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Kahlotus, 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 Kahlotus 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 Kahlotus — soil, climate, flood, and parcel records. How we handle your address.
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Kahlotus — the short answer
Kahlotus, Washington: USDA zone 7a, about 227 days between hard freezes, across 243 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 243 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 Kahlotus's average, not your lot's — a low corner or a tree line moves it. Against Kahlotus's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Kahlotus
Each reading below is measured for Kahlotus itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredKahlotus runs about 227 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
MeasuredKahlotus 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 Kahlotus is in
Kahlotus sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Kahlotus's own centroid rather than borrowed from Franklin County.
What Grows in Kahlotus
Every plant below cleared Kahlotus's own zone 7a and its 227-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Kahlotus?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Kahlotus
Closest first, within ~10 miles of Kahlotus. Listing isn't leaking, and distance isn't exposure.
- KAHLOTUS SCHOOL DISTRICT 56Underground Storage Tanks · 900 ft
- CARR-PARKER FARMSUnderground Storage Tanks · 1.5 mi
- MOORE FARMS COUnderground Storage Tanks · 2.4 mi
- WILLIAM HARDERUnderground Storage Tanks · 3.3 mi
- JOHN A HARDERUnderground Storage Tanks · 3.3 mi
- KAHLOTUS WA LINE SEG 47 PRINT 377Underground Storage Tanks · 3.3 mi
- LOWER MONUMENTAL SUBSTATIONUnderground Storage Tanks · 3.3 mi
- FRANKLIN COUNTY HIGHWAY DEPTUnderground Storage Tanks · 3.3 mi
- JAMES D MOOREUnderground Storage Tanks · 3.3 mi
- LOWER MONUMENTAL DAMUnderground Storage Tanks · 5.5 mi
- WATSON FARMUnderground Storage Tanks · 5.5 mi
- 13N/34E-33R02Nitrate · 5.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Kahlotus'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 Kahlotus.
Sources Checked
within ~10 miles of Kahlotus
Severity Distribution
within ~10 miles of Kahlotus
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Kahlotus
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 Kahlotus average
Your land is one point inside Kahlotus
Everything above resolves to Kahlotus as a whole — one PHZM band and one 28°F frost record, read across 243 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 Kahlotus Average
Kahlotus Average
- ●USDA Zones 7a, averaged across Kahlotus
- ●One soil character for all of Kahlotus
- ●Frost dates read at Kahlotus's scale: Mar 21 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Kahlotus's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Kahlotus
Pull a site-specific report for your exact address in Kahlotus, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kahlotus averages can't show:
We read public map data around Kahlotus — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kahlotus average
How we know this about Kahlotus
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 Kahlotus’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 Kahlotus
When does frost risk typically end in Kahlotus?
The last hard freeze (28°F) in Kahlotus typically lands around Mar 21, 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 11.
When is the first frost in Kahlotus?
The first hard freeze (28°F) in Kahlotus typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 227 days after the spring freeze cleared.
How long is the growing season in Kahlotus?
Measured between 28°F hard freezes, Kahlotus sees about 227 frost-free days — roughly Mar 21 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 11 to Oct 20, about 192 days.
Is the soil safe to grow vegetables in Kahlotus?
The federal record around Kahlotus is light — 24 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (17), the nearest Underground Storage Tanks record about 0.2 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 Kahlotus?
From about Oct 4 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 3 (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 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Kahlotus's scale — its 7a band and its 227-day season. Your yard writes its own version of Kahlotus'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 Kahlotus’s own scale
6 of the readings below were taken at Kahlotus's own scale — its own ~227-day season between 28°F freezes, the 243 acres it covers and 24 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Kahlotus's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Kahlotus's own 28°F hard-freeze dates, about Mar 21 and Nov 3 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 24 documented contamination sites on the federal record near Kahlotus, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Kahlotus's boundary and the 243 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Kahlotus's own centroid, the Columbia PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Kahlotus's 243 acres read through its county's SSURGO summaryfrom Franklin County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Franklin 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 Franklin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kahlotus's 243 acreswhy one lot differs from the next →
- Which side of Kahlotus you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 243 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Kahlotus-wide figureread your own land →
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