Lewisville, Idaho, sits in USDA hardiness zone 5a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include cabbage, cranberry, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Lewisville, 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 Lewisville 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 Lewisville — soil, climate, flood, and parcel records. How we handle your address.
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Lewisville — the short answer
Lewisville, Idaho: USDA zone 5a, about 148 days between hard freezes, across 425 acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~148
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 425 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 5a is Lewisville's average, not your lot's — a low corner or a tree line moves it. Against Lewisville's 148-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Lewisville
Each reading below is measured for Lewisville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLewisville runs about 148 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredLewisville sits in USDA hardiness zone 5a.
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 Lewisville is in
Lewisville sits in the Snake River Plain — EPA Level III, inside the wider North American Deserts. That is read at Lewisville's own centroid rather than borrowed from Jefferson County.
What Grows in Lewisville
Every plant below cleared Lewisville's own zone 5a and its 148-day season. Each card opens that plant's Idaho profile. How we score.
Is it too late to plant in Lewisville?
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 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 2 — long-season crops need about 90 days of runway, quick greens only 30. In a season this compact, fast finishers and cold-hardy greens do the late work, and garlic tucked in before the freeze repays you next summer.
What's on the federal record near Lewisville
Closest first, within ~10 miles of Lewisville. Listing isn't leaking, and distance isn't exposure.
- ROUND'S SERVICEUnderground Storage Tanks · 0.5 mi
- Jefferson Joint School District 251Underground Storage Tanks · 0.6 mi
- IDAHOAN FOODS LEWISVILLE PLANTBrownfields · 0.6 mi
- WALKER FARMSUnderground Storage Tanks · 1.6 mi
- MIDWAY ELEMENTARY SCHOOLUnderground Storage Tanks · 1.7 mi
- 05N 38E 32ADD1Nitrate · 1.9 mi
- 05N 38E 31CAA1Nitrate · 2.0 mi
- BOYLE LAND AND LIVESTOCK INC (FEEDLOT)CAFO · 2.4 mi
- SKAAR LIVESTOCKCAFO · 2.5 mi
- LOUIS SKAAR & SON'S INC.Underground Storage Tanks · 2.5 mi
- 04N 38E 10DDD1Nitrate · 2.6 mi
- UNION PACIFIC RAILROAD (8)Underground Storage Tanks · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Lewisville'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 Lewisville.
Total Sites
163
within ~10 miles of Lewisville
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Lewisville
Severity Distribution
within ~10 miles of Lewisville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Lewisville, two things run higher than the national average within ~10 miles of Lewisville — CAFO (3 sites) and Nitrate (84 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 Lewisville
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 Lewisville average
Your land is one point inside Lewisville
Everything above resolves to Lewisville as a whole — one PHZM band and one 28°F frost record, read across 425 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 Lewisville Average
Lewisville Average
- ●USDA Zones 5a, averaged across Lewisville
- ●One soil character for all of Lewisville
- ●Frost dates read at Lewisville's scale: May 7 to Oct 2
YOUR Parcel
- ✓Your exact zone, not Lewisville's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Lewisville
Pull a site-specific report for your exact address in Lewisville, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Lewisville averages can't show:
We read public map data around Lewisville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Lewisville average
How we know this about Lewisville
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 Lewisville’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 Lewisville
When does frost risk typically end in Lewisville?
The last hard freeze (28°F) in Lewisville typically lands around May 7, 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 28.
When is the first frost in Lewisville?
The first hard freeze (28°F) in Lewisville typically arrives around Oct 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 18, so the watching starts about Sep 2 — about 148 days after the spring freeze cleared.
How long is the growing season in Lewisville?
Measured between 28°F hard freezes, Lewisville sees about 148 frost-free days — roughly May 7 through Oct 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 28 to Sep 18, about 113 days.
Is the soil safe to grow vegetables in Lewisville?
The federal record around Lewisville is a meaningful one — 163 documented sites, mostly Nitrate entries (84), the nearest Underground Storage Tanks record about 0.5 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 gardeners stretch the season in Lewisville?
With about 148 frost-free days between hard freezes, Lewisville rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 176 to 204 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 7 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Lewisville's scale — its 5a band and its 148-day season. Your yard writes its own version of Lewisville'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 Lewisville’s own scale
6 of the readings below were taken at Lewisville's own scale — its own ~148-day season between 28°F freezes, the 425 acres it covers and 163 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Lewisville's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Lewisville's own 28°F hard-freeze dates, about May 7 and Oct 2 and the ~148-day span between themNOAA 1991–2020 Climate Normals
- 163 documented contamination sites on the federal record near Lewisville, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Lewisville's boundary and the 425 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~148-day seasonGrowable Ground crop-matching engine
- The ecoregion at Lewisville's own centroid, the Snake River PlainUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Lewisville's 425 acres read through its county's SSURGO summaryfrom Jefferson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jefferson 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 Jefferson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Lewisville's 425 acreswhy one lot differs from the next →
- Which side of Lewisville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 425 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Lewisville-wide figureread your own land →