Kellogg, Idaho, sits in USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
The conditions favor cabbage, blackberry, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Kellogg, 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 Kellogg 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 Kellogg — soil, climate, flood, and parcel records. How we handle your address.
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Kellogg — the short answer
Kellogg, Idaho: USDA zone 6b, about 181 days between hard freezes, across 3K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~181
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 6b is Kellogg's average, not your lot's — a low corner or a tree line moves it. Against Kellogg's 181-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Kellogg
Each reading below is measured for Kellogg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredKellogg runs about 181 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
MeasuredKellogg sits in USDA hardiness zone 6b.
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 Kellogg is in
Kellogg sits in the Northern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Kellogg's own centroid rather than borrowed from Shoshone County.
What Grows in Kellogg
Every plant below cleared Kellogg's own zone 6b and its 181-day season. Each card opens that plant's Idaho profile. How we score.
Is it too late to plant in Kellogg?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 23; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 18 — 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 Kellogg
Closest first, within ~10 miles of Kellogg. Listing isn't leaking, and distance isn't exposure.
- BUNKER HILL MINEBrownfields · 1400 ft
- StemwinderMining · 1600 ft
- Bunker Hill MineMining · 1600 ft
- (Facility) Bunker Hill Lead Smelter & RefineryMining · 1600 ft
- US EPA BUNKER HILL SUPERFUND SITEToxics Release Inventory · 1700 ft
- Bunker ChanceMining · 1700 ft
- KELLOGG PLANTUnderground Storage Tanks · 1800 ft
- BH-SF-E-0302-L-South Fork East-Transect 2 AreaNitrate · 2100 ft
- 48N 03E 06BAC1Nitrate · 2200 ft
- BH-SF-E-0301-U-South Fork East-Transect 2 AreaNitrate · 2200 ft
- ROY NICKERSONUnderground Storage Tanks · 2200 ft
- KELLOGG SUPER STOP LLCUnderground Storage Tanks · 2300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Kellogg'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 Kellogg.
Sources Checked
within ~10 miles of Kellogg
Severity Distribution
within ~10 miles of Kellogg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kellogg, two things run higher than the national average within ~10 miles of Kellogg — Mining (247 sites) and Nitrate (246 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Kellogg
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 Kellogg average
Your land is one point inside Kellogg
Everything above resolves to Kellogg as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Kellogg Average
Kellogg Average
- ●USDA Zones 6b, averaged across Kellogg
- ●One soil character for all of Kellogg
- ●Frost dates read at Kellogg's scale: Apr 20 to Oct 18
YOUR Parcel
- ✓Your exact zone, not Kellogg's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Kellogg
Pull a site-specific report for your exact address in Kellogg, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kellogg averages can't show:
We read public map data around Kellogg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kellogg average
How we know this about Kellogg
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 Kellogg’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 Kellogg
When does frost risk typically end in Kellogg?
The last hard freeze (28°F) in Kellogg typically lands around Apr 20, 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 11.
When is the first frost in Kellogg?
The first hard freeze (28°F) in Kellogg typically arrives around Oct 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 4, so the watching starts about Sep 18 — about 181 days after the spring freeze cleared.
How long is the growing season in Kellogg?
Measured between 28°F hard freezes, Kellogg sees about 181 frost-free days — roughly Apr 20 through Oct 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 11 to Oct 4, about 146 days.
Is the soil safe to grow vegetables in Kellogg?
The federal record around Kellogg runs heavier than most — 577 documented sites, mostly Mining entries (247), the nearest Brownfields record about 0.3 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Kellogg?
From about Sep 18 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 18 (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 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Kellogg's scale — its 6b band and its 181-day season. Your yard writes its own version of Kellogg'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 Kellogg’s own scale
6 of the readings below were taken at Kellogg's own scale — its own ~181-day season between 28°F freezes, the 2,543 acres it covers and 577 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Kellogg's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Kellogg's own 28°F hard-freeze dates, about Apr 20 and Oct 18 and the ~181-day span between themNOAA 1991–2020 Climate Normals
- 577 documented contamination sites on the federal record near Kellogg, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Kellogg's boundary and the 2,543 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~181-day seasonGrowable Ground crop-matching engine
- The ecoregion at Kellogg's own centroid, the Northern RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Kellogg's 2,543 acres read through its county's SSURGO summaryfrom Shoshone County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Shoshone County
- The growing challenges every Idaho grower plans around — written at state scale, so they stay on the state guidefrom Idaho
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Shoshone County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kellogg's 2,543 acreswhy one lot differs from the next →
- Which side of Kellogg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,543 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Kellogg-wide figureread your own land →
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