Jerome, Idaho, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, blackberry, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Jerome, 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 Jerome 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 Jerome — soil, climate, flood, and parcel records. How we handle your address.
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Jerome — the short answer
Jerome, Idaho: USDA zone 6b, about 188 days between hard freezes, across 4K 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 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~188
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K 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 Jerome's average, not your lot's — a low corner or a tree line moves it. Against Jerome's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Jerome
Each reading below is measured for Jerome itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredJerome runs about 188 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
MeasuredJerome 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 Jerome is in
Jerome sits in the Snake River Plain — EPA Level III, inside the wider North American Deserts. That is read at Jerome's own centroid rather than borrowed from Jerome County.
What Grows in Jerome
Every plant below cleared Jerome's own zone 6b and its 188-day season. Each card opens that plant's Idaho profile. How we score.
Is it too late to plant in Jerome?
Almost never — the real question is what to plant next. 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 25 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Jerome
Closest first, within ~10 miles of Jerome. Listing isn't leaking, and distance isn't exposure.
- PAULS AUTO REPAIRBrownfields · 800 ft
- SAGE BRUSH SAM'SUnderground Storage Tanks · 900 ft
- JEROME IMPLEMENT COUnderground Storage Tanks · 1000 ft
- BEAN GROWERSUnderground Storage Tanks · 1000 ft
- ITD JEROME MTCE YARD #41500Underground Storage Tanks · 1000 ft
- BLUE LAKES COUNTRY CLUBUnderground Storage Tanks · 1000 ft
- MAGIC VALLEY DAIRY 2/HORIZON ORGANIC DAIRYUnderground Storage Tanks · 1000 ft
- BERGER & COUnderground Storage Tanks · 1000 ft
- UNION PACIFIC RAILROAD (3) JEROMEUnderground Storage Tanks · 1000 ft
- AT&T JEROME JCTUnderground Storage Tanks · 1000 ft
- US West (Qwest) FLAT BUTTE RD.Underground Storage Tanks · 1000 ft
- MAVERIK COUNTRY STORE #252Underground Storage Tanks · 1400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Jerome'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 Jerome.
Total Sites
331
within ~10 miles of Jerome
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Jerome
Severity Distribution
within ~10 miles of Jerome
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jerome, two things run higher than the national average within ~10 miles of Jerome — CAFO (34 sites) and Nitrate (158 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.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Jerome
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 Jerome average
Your land is one point inside Jerome
Everything above resolves to Jerome as a whole — one PHZM band and one 28°F frost record, read across 4K 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 Jerome Average
Jerome Average
- ●USDA Zones 6b, averaged across Jerome
- ●One soil character for all of Jerome
- ●Frost dates read at Jerome's scale: Apr 20 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Jerome's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Jerome
Pull a site-specific report for your exact address in Jerome, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jerome averages can't show:
We read public map data around Jerome — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jerome average
How we know this about Jerome
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 Jerome’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 Jerome
When does frost risk typically end in Jerome?
The last hard freeze (28°F) in Jerome 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 Jerome?
The first hard freeze (28°F) in Jerome typically arrives around Oct 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 11, so the watching starts about Sep 25 — about 188 days after the spring freeze cleared.
How long is the growing season in Jerome?
Measured between 28°F hard freezes, Jerome sees about 188 frost-free days — roughly Apr 20 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 11 to Oct 11, about 153 days.
Is the soil safe to grow vegetables in Jerome?
The federal record around Jerome is a meaningful one — 331 documented sites, mostly Nitrate entries (158), the nearest Brownfields 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 Jerome?
From about Sep 25 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Jerome's scale — its 6b band and its 188-day season. Your yard writes its own version of Jerome'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 Jerome’s own scale
6 of the readings below were taken at Jerome's own scale — its own ~188-day season between 28°F freezes, the 3,622 acres it covers and 331 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Jerome's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Jerome's own 28°F hard-freeze dates, about Apr 20 and Oct 25 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 331 documented contamination sites on the federal record near Jerome, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Jerome's boundary and the 3,622 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~188-day seasonGrowable Ground crop-matching engine
- The ecoregion at Jerome's own centroid, the Snake River PlainUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Jerome's 3,622 acres read through its county's SSURGO summaryfrom Jerome County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jerome 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 Jerome County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Jerome's 3,622 acreswhy one lot differs from the next →
- Which side of Jerome you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,622 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Jerome-wide figureread your own land →
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