Avon, South Dakota, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
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 Avon, 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 Avon 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 Avon — soil, climate, flood, and parcel records. How we handle your address.
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Avon — the short answer
Avon, South Dakota: USDA zone 5a, about 183 days between hard freezes, across 415 acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~183
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 415 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 Avon's average, not your lot's — a low corner or a tree line moves it. Against Avon's 183-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Avon
Each reading below is measured for Avon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAvon runs about 183 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
MeasuredAvon 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 Avon is in
Avon sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Avon's own centroid, and it is not what its county reads: Bon Homme County is mostly Northern Glaciated Plains. The wider page above you is answering a different question about different ground.
What Grows in Avon
Every plant below cleared Avon's own zone 5a and its 183-day season. Each card opens that plant's South Dakota profile. How we score.
Is it too late to plant in Avon?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 19 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Avon
Closest first, within ~10 miles of Avon. Listing isn't leaking, and distance isn't exposure.
- OTT'S SERVICEUnderground Storage Tanks · 450 ft
- FARMER COOP FUELUnderground Storage Tanks · 500 ft
- CAHOY GAS & SERVICEUnderground Storage Tanks · 550 ft
- 95N61W33ACBBNitrate · 800 ft
- 95N61W33ACBB2Nitrate · 800 ft
- 95N61W33ACCCNitrate · 900 ft
- JURRENS REPAIR (FORMER)Brownfields · 1700 ft
- A 1 GAS & GOUnderground Storage Tanks · 1800 ft
- 94N61W16AAACNitrate · 2.7 mi
- 94N61W 7CAANitrate · 3.0 mi
- 94N61W11CDDCNitrate · 3.1 mi
- 94N61W18ACNitrate · 3.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Avon'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 Avon.
Severity Distribution
within ~10 miles of Avon
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Avon, Nitrate runs higher than the national average — 142 sites within ~10 miles of Avon. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Avon
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 Avon average
Your land is one point inside Avon
Everything above resolves to Avon as a whole — one PHZM band and one 28°F frost record, read across 415 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 Avon Average
Avon Average
- ●USDA Zones 5a, averaged across Avon
- ●One soil character for all of Avon
- ●Frost dates read at Avon's scale: Apr 19 to Oct 19
YOUR Parcel
- ✓Your exact zone, not Avon's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Avon
Pull a site-specific report for your exact address in Avon, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Avon averages can't show:
We read public map data around Avon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Avon average
How we know this about Avon
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 Avon’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 Avon
When does frost risk typically end in Avon?
The last hard freeze (28°F) in Avon typically lands around Apr 19, 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 10.
When is the first frost in Avon?
The first hard freeze (28°F) in Avon typically arrives around Oct 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 5, so the watching starts about Sep 19 — about 183 days after the spring freeze cleared.
How long is the growing season in Avon?
Measured between 28°F hard freezes, Avon sees about 183 frost-free days — roughly Apr 19 through Oct 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 10 to Oct 5, about 148 days.
Is the soil safe to grow vegetables in Avon?
The federal record around Avon shows 154 documented sites, mostly Nitrate entries (142), the nearest Underground Storage Tanks record under a tenth of a mile out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Avon?
From about Sep 19 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 19 (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 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Avon's scale — its 5a band and its 183-day season. Your yard writes its own version of Avon'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 Avon’s own scale
6 of the readings below were taken at Avon's own scale — its own ~183-day season between 28°F freezes, the 415 acres it covers and 154 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Avon's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Avon's own 28°F hard-freeze dates, about Apr 19 and Oct 19 and the ~183-day span between themNOAA 1991–2020 Climate Normals
- 154 documented contamination sites on the federal record near Avon, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Avon's boundary and the 415 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~183-day seasonGrowable Ground crop-matching engine
- Avon sits in the Northwestern Glaciated Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Avon's 415 acres read through its county's SSURGO summaryfrom Bon Homme County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Bon Homme County
- The growing challenges every South Dakota grower plans around — written at state scale, so they stay on the state guidefrom South Dakota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Bon Homme County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Avon's 415 acreswhy one lot differs from the next →
- Which side of Avon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 415 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 Avon-wide figureread your own land →