Bannock County, in Idaho, sits in USDA hardiness zone 5b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
A short list that earns its place here — cabbage, cranberry, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Bannock County lies within the Eastern Idaho (Upper Snake River Valley) — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Bannock County holds more than one microclimate.
Soils and elevations shift across Bannock County, so your frost dates and drainage aren't the county average. 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 Bannock County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Bannock County — the short answer
Bannock County, Idaho: USDA zone 5b, about 159 days between hard freezes, across 712K acres.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 2
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 8
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~159
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 712K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 5b is Bannock County's average, not your lot's — a low corner or a tree line moves it. Against Bannock County's 159-day season, see what your own ground reads.
Heat in Bannock County
Across a year, Bannock County accumulates about 1,851 growing degree days above 50°F, about 360 more than the middle Idaho county — ahead of 29 of Idaho’s 44 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Bannock County
Across Bannock County, the ground is predominantly Mollisols, where Rexburg, Neeley, and Pocatello are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 7.0–7.9, slightly alkaline. Rainfall drains through hydrologic group B soils.
Soil order
Mollisols
Drainage
Well drained
Hydric soils
2%
Soil still varies lot by lot — soil types explained.
How the ground varies across Bannock County
The USDA soil survey maps 87% of Bannock County as well drained — but another 8% drains differently: 4% somewhat excessively drained, 2% poorly drained.
Rexburg is the most extensive named soil at 11% of mapped acres, then Neeley (9%) and Pocatello (7%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Bannock County
Each reading below is measured for Bannock County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Bannock County are well drained, in hydrologic group B — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Bannock County runs about pH 7.0–7.9, on the alkaline side.
Many vegetables cope, but acid-lovers like blueberries struggle, and iron and manganese lock up above about pH 7.5 — leaves yellow between the veins even in rich soil.
Elemental sulfur and generous organic matter lower pH slowly for the beds that need it; test first so you add only what the soil actually calls for.
USDA NRCS SSURGO
Season length
MeasuredBannock County runs about 159 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
MeasuredBannock County sits in USDA hardiness zone 5b.
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 Bannock County is in
Bannock County spans 2 EPA Level III ecoregions — Northern Basin and Range (89%) and Snake River Plain (9%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Bannock County
We scored all 1,086 plants against Bannock County's own USDA zone 5b and its own 159-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Idaho profile.
Is it too late to plant in Bannock County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 8 — 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 gets applied to farmland in Bannock County
USGS estimates 26,656 lb of Glyphosate on Bannock County farmland in 2019, its largest by weight, ahead of 2,4-d (14,305 lb) and Metolachlor-s (4,439 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Bannock County — and how to grow with it.
We checked the federal record across Bannock County — 565 documented sites across 8 of the 9 source types we track.
The most significant on record: 8 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Bannock County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Bannock County
Closest first, across Bannock County. Listing isn't leaking, and distance isn't exposure.
- 08S 36E 22BCD1Nitrate · 1.4 mi
- 08S 36E 36CAB1Nitrate · 1.9 mi
- 08S 36E 15CDC1Nitrate · 1.9 mi
- 09S 36E 03CACC1Nitrate · 2.0 mi
- MCCAMMON TEXACOUnderground Storage Tanks · 2.1 mi
- 09S 36E 02DDC1Nitrate · 2.5 mi
- Pilot Flying J Travel Plaza #641Underground Storage Tanks · 2.5 mi
- 09S 36E 01CAB1Nitrate · 2.5 mi
- MCCAMMON CHEVRONUnderground Storage Tanks · 2.5 mi
- 08S 36E 10CDC1Nitrate · 2.8 mi
- MCCAMMON #5140 ITDUnderground Storage Tanks · 2.8 mi
- Aaron HunsakerUnderground Storage Tanks · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Bannock County'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 Bannock County.
Severity Distribution
across Bannock County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Bannock County, two things run higher than the national average across Bannock County — Superfund (8 sites) and Nitrate (152 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Bannock County
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 Bannock County average
Your land is one point inside Bannock County
Everything above resolves to Bannock County as a whole — one PHZM band and one county frost record, read across 712K 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 county 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 county average.
Your Lot vs the Bannock County Average
Bannock County Average
- ●USDA Zones 5b, averaged across Bannock County
- ●One soil character for all of Bannock County
- ●Frost dates read at Bannock County's scale: May 2 to Oct 8
YOUR Parcel
- ✓Your exact zone, not Bannock County's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Bannock County
Pull a site-specific report for your exact address in Bannock County, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Bannock County averages can't show:
We read public map data around Bannock County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Bannock County average
How we know this about Bannock County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Bannock County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Bannock County
When does frost risk typically end in Bannock County?
The last hard freeze (28°F) in Bannock County typically lands around May 2, 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 23.
How long is the growing season in Bannock County?
Measured between 28°F hard freezes, Bannock County sees about 159 frost-free days — roughly May 2 through Oct 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 23 to Sep 24, about 124 days.
Is the soil safe to grow vegetables in Bannock County?
The federal record around Bannock County runs heavier than most — 565 documented sites, mostly Underground Storage Tanks entries (303), the nearest Nitrate record about 1.4 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.
Everything above is measured at Bannock County's scale — its 5b band and its 159-day season. Your yard writes its own version of Bannock County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Idaho's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Bannock County’s own scale
8 of the readings below were taken at Bannock County's own scale — its own ~159-day span between 28°F freezes, the 3 most extensive soil series mapped here and 565 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Bannock County's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Bannock County's own 28°F hard-freeze dates and its ~159-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Bannock CountyUSDA NRCS SSURGO
- 565 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 1.4 miles outFederal environmental registers
- Bannock County's boundary and the 711,993 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~159-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Bannock County spans, Northern Basin and Range the largestUS EPA Level III Ecoregions
- Which agricultural compounds go onto Bannock County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Idaho grower plans around — written at state scale, so they stay on the state guidefrom Idaho
What this page can’t tell you
- How the season shifts across Bannock County — the ~159 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Bannock County's 711,993 acreswhy one lot differs from the next →
- Which of those 565 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Bannock Countyread your own land →