Riverside, 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.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Riverside, 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 Riverside 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 Riverside — soil, climate, flood, and parcel records. How we handle your address.
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Riverside — the short answer
Riverside, Idaho: USDA zone 5b, about 165 days between hard freezes, across 1K acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~165
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 5b is Riverside's average, not your lot's — a low corner or a tree line moves it. Against Riverside's 165-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Riverside
Each reading below is measured for Riverside itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRiverside runs about 165 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
MeasuredRiverside 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 Riverside is in
Riverside sits in the Snake River Plain — EPA Level III, inside the wider North American Deserts. That is read at Riverside's own centroid rather than borrowed from Bingham County.
What Grows in Riverside
Every plant below cleared Riverside's own zone 5b and its 165-day season. Each card opens that plant's Idaho profile. How we score.
Is it too late to plant in Riverside?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Apr 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 12 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Riverside
Closest first, within ~10 miles of Riverside. Listing isn't leaking, and distance isn't exposure.
- PETERSON'S STOREUnderground Storage Tanks · 25 ft
- COUNTRY SAVINGSUnderground Storage Tanks · 300 ft
- Chad's PlaceUnderground Storage Tanks · 350 ft
- SCOTTIES MARKETUnderground Storage Tanks · 600 ft
- 02S 34E 35DDA1Nitrate · 900 ft
- DON & ELAINE MANGUMUnderground Storage Tanks · 1800 ft
- MILLCREEK METALSToxics Release Inventory · 0.9 mi
- MILLCREEK METALSBrownfields · 0.9 mi
- GARY'S SERVICEUnderground Storage Tanks · 1.5 mi
- SIMPLOT GROWER SOLUTIONS MORELANDBrownfields · 1.5 mi
- BLACKFOOT BRASSToxics Release Inventory · 1.5 mi
- SPUDNIK EQUIPMENT CO (PLANT 3)Brownfields · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Riverside'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 Riverside.
Total Sites
278
within ~10 miles of Riverside
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Riverside
Severity Distribution
within ~10 miles of Riverside
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Riverside, two things run higher than the national average within ~10 miles of Riverside — CAFO (7 sites) and Nitrate (144 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 Riverside
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 Riverside average
Your land is one point inside Riverside
Everything above resolves to Riverside as a whole — one PHZM band and one 28°F frost record, read across 1K 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 town 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 Riverside Average
Riverside Average
- ●USDA Zones 5b, averaged across Riverside
- ●One soil character for all of Riverside
- ●Frost dates read at Riverside's scale: Apr 30 to Oct 12
YOUR Parcel
- ✓Your exact zone, not Riverside's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Riverside
Pull a site-specific report for your exact address in Riverside, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Riverside averages can't show:
We read public map data around Riverside — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Riverside average
How we know this about Riverside
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Riverside’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 town grain anywhere on this page — there is no town-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 Riverside
When does frost risk typically end in Riverside?
The last hard freeze (28°F) in Riverside typically lands around Apr 30, 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 21.
When is the first frost in Riverside?
The first hard freeze (28°F) in Riverside typically arrives around Oct 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 28, so the watching starts about Sep 12 — about 165 days after the spring freeze cleared.
How long is the growing season in Riverside?
Measured between 28°F hard freezes, Riverside sees about 165 frost-free days — roughly Apr 30 through Oct 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Sep 28, about 130 days.
Is the soil safe to grow vegetables in Riverside?
The federal record around Riverside is a meaningful one — 278 documented sites, mostly Nitrate entries (144), the nearest Underground Storage Tanks record under a tenth of a mile 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 Riverside?
From about Sep 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 Oct 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Riverside's scale — its 5b band and its 165-day season. Your yard writes its own version of Riverside'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 Riverside’s own scale
6 of the readings below were taken at Riverside's own scale — its own ~165-day season between 28°F freezes, the 1,373 acres it covers and 278 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Riverside's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Riverside's own 28°F hard-freeze dates, about Apr 30 and Oct 12 and the ~165-day span between themNOAA 1991–2020 Climate Normals
- 278 documented contamination sites on the federal record near Riverside, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Riverside's boundary and the 1,373 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~165-day seasonGrowable Ground crop-matching engine
- The ecoregion at Riverside's own centroid, the Snake River PlainUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Riverside's 1,373 acres read through its county's SSURGO summaryfrom Bingham County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Bingham 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 Bingham County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Riverside's 1,373 acreswhy one lot differs from the next →
- Which side of Riverside you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,373 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Riverside-wide figureread your own land →