White Horse, South Dakota, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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.
Even in White Horse, 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 White Horse 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 White Horse — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
White Horse — the short answer
White Horse, South Dakota: USDA zone 5a, about 163 days between hard freezes, across 2K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 2
- 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
- ~163
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 White Horse's average, not your lot's — a low corner or a tree line moves it. Against White Horse's 163-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in White Horse
Each reading below is measured for White Horse itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWhite Horse runs about 163 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
MeasuredWhite Horse 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 White Horse is in
White Horse sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at White Horse's own centroid rather than borrowed from Todd County.
What Grows in White Horse
Every plant below cleared White Horse's own zone 5a and its 163-day season. Each card opens that plant's South Dakota profile. How we score.
Is it too late to plant in White Horse?
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 12 — 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 White Horse
Closest first, within ~10 miles of White Horse. Listing isn't leaking, and distance isn't exposure.
- ROSEBUD RECYCLINGBrownfields · 2.5 mi
- THE GUS STOPUnderground Storage Tanks · 2.6 mi
- RITTER'S PAWN & GASUnderground Storage Tanks · 2.7 mi
- LITTLEBURG ELEMENTARYUnderground Storage Tanks · 2.7 mi
- LAKEVIEW ELEMENTARYUnderground Storage Tanks · 2.7 mi
- RALPH'S BODY SHOP & WRECKER SERVICEUnderground Storage Tanks · 2.7 mi
- EDWARD CHARBONNEAUUnderground Storage Tanks · 2.8 mi
- NAPA AUTO PARTSBrownfields · 3.0 mi
- TODD COUNTY HIGH SCHOOLBrownfields · 3.0 mi
- E-24Underground Storage Tanks · 3.1 mi
- 38N28W 5AACNitrate · 3.1 mi
- AMOCO FOOD SHOP #7Brownfields · 3.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from White Horse'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 White Horse.
Sources Checked
within ~10 miles of White Horse
Severity Distribution
within ~10 miles of White Horse
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around White Horse, Nitrate runs higher than the national average — 28 sites within ~10 miles of White Horse. 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 White Horse
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 White Horse average
Your land is one point inside White Horse
Everything above resolves to White Horse as a whole — one PHZM band and one 28°F frost record, read across 2K 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 White Horse Average
White Horse Average
- ●USDA Zones 5a, averaged across White Horse
- ●One soil character for all of White Horse
- ●Frost dates read at White Horse's scale: May 2 to Oct 12
YOUR Parcel
- ✓Your exact zone, not White Horse's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in White Horse
Pull a site-specific report for your exact address in White Horse, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that White Horse averages can't show:
We read public map data around White Horse — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the White Horse average
How we know this about White Horse
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 White Horse’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 White Horse
When does frost risk typically end in White Horse?
The last hard freeze (28°F) in White Horse 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.
When is the first frost in White Horse?
The first hard freeze (28°F) in White Horse 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 163 days after the spring freeze cleared.
How long is the growing season in White Horse?
Measured between 28°F hard freezes, White Horse sees about 163 frost-free days — roughly May 2 through Oct 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 23 to Sep 28, about 128 days.
Is the soil safe to grow vegetables in White Horse?
The federal record around White Horse shows 45 documented sites, mostly Nitrate entries (28), the nearest Brownfields record about 2.5 miles 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 White Horse?
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 White Horse's scale — its 5a band and its 163-day season. Your yard writes its own version of White Horse'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 White Horse’s own scale
6 of the readings below were taken at White Horse's own scale — its own ~163-day season between 28°F freezes, the 2,022 acres it covers and 45 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- White Horse's own USDA hardiness band, zones 5aUSDA PHZM 2023
- White Horse's own 28°F hard-freeze dates, about May 2 and Oct 12 and the ~163-day span between themNOAA 1991–2020 Climate Normals
- 45 documented contamination sites on the federal record near White Horse, the closest Brownfields record about 2.5 miles out from the town centreFederal environmental registers
- White Horse's boundary and the 2,022 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~163-day seasonGrowable Ground crop-matching engine
- The ecoregion at White Horse's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so White Horse's 2,022 acres read through its county's SSURGO summaryfrom Todd County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Todd 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 Todd County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among White Horse's 2,022 acreswhy one lot differs from the next →
- Which side of White Horse you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,022 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 2.5 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 White Horse-wide figureread your own land →
More in South Dakota
Growing region