Bullhead, South Dakota, sits in USDA hardiness zone 4a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, cranberry, turkish rocket, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Bullhead, 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 Bullhead 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 Bullhead — soil, climate, flood, and parcel records. How we handle your address.
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Bullhead — the short answer
Bullhead, South Dakota: USDA zone 4a, about 160 days between hard freezes, across 2K acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~160
- 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 4a is Bullhead's average, not your lot's — a low corner or a tree line moves it. Against Bullhead's 160-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Bullhead
Each reading below is measured for Bullhead itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBullhead runs about 160 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
MeasuredBullhead sits in USDA hardiness zone 4a.
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 Bullhead is in
Bullhead sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Bullhead's own centroid rather than borrowed from Corson County.
What Grows in Bullhead
Every plant below cleared Bullhead's own zone 4a and its 160-day season. Each card opens that plant's South Dakota profile. How we score.
Is it too late to plant in Bullhead?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 1 (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. 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 Bullhead
Closest first, within ~10 miles of Bullhead. Listing isn't leaking, and distance isn't exposure.
- 021N24E24ACDANitrate · 1800 ft
- ROCK CREEK SCHOOLUnderground Storage Tanks · 1900 ft
- 021N24E24DBCNitrate · 0.7 mi
- BULLHEAD TRADING POSTUnderground Storage Tanks · 1.5 mi
- 022N24E28DDDDNitrate · 5.2 mi
- 022N24E24BCBNitrate · 5.9 mi
- WALKERUnderground Storage Tanks · 9.4 mi
- CLYDE RISCHEUnderground Storage Tanks · 9.6 mi
Measured from Bullhead'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 Bullhead.
Severity Distribution
within ~10 miles of Bullhead
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
Check your specific parcel in Bullhead
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 Bullhead average
Your land is one point inside Bullhead
Everything above resolves to Bullhead 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 Bullhead Average
Bullhead Average
- ●USDA Zones 4a, averaged across Bullhead
- ●One soil character for all of Bullhead
- ●Frost dates read at Bullhead's scale: May 1 to Oct 8
YOUR Parcel
- ✓Your exact zone, not Bullhead's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Bullhead
Pull a site-specific report for your exact address in Bullhead, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Bullhead averages can't show:
We read public map data around Bullhead — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Bullhead average
How we know this about Bullhead
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 Bullhead’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 Bullhead
When does frost risk typically end in Bullhead?
The last hard freeze (28°F) in Bullhead typically lands around May 1, 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 22.
When is the first frost in Bullhead?
The first hard freeze (28°F) in Bullhead typically arrives around Oct 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 24, so the watching starts about Sep 8 — about 160 days after the spring freeze cleared.
How long is the growing season in Bullhead?
Measured between 28°F hard freezes, Bullhead sees about 160 frost-free days — roughly May 1 through Oct 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 22 to Sep 24, about 125 days.
Is the soil safe to grow vegetables in Bullhead?
The federal record around Bullhead is light — 12 documented sites across the 9 federal source types we checked, mostly Nitrate entries (8), the nearest Nitrate record about 0.3 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Bullhead?
From about Sep 8 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Bullhead's scale — its 4a band and its 160-day season. Your yard writes its own version of Bullhead'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 Bullhead’s own scale
6 of the readings below were taken at Bullhead's own scale — its own ~160-day season between 28°F freezes, the 1,929 acres it covers and 12 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Bullhead's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Bullhead's own 28°F hard-freeze dates, about May 1 and Oct 8 and the ~160-day span between themNOAA 1991–2020 Climate Normals
- 12 documented contamination sites on the federal record near Bullhead, the closest Nitrate record about 0.3 miles out from the town centreFederal environmental registers
- Bullhead's boundary and the 1,929 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~160-day seasonGrowable Ground crop-matching engine
- The ecoregion at Bullhead's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Bullhead's 1,929 acres read through its county's SSURGO summaryfrom Corson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Corson 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 Corson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Bullhead's 1,929 acreswhy one lot differs from the next →
- Which side of Bullhead you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,929 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.3 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 Bullhead-wide figureread your own land →
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