Sparkman, Arkansas, sits in USDA hardiness zone 8a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Sparkman, 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 Sparkman 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 Sparkman — soil, climate, flood, and parcel records. How we handle your address.
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Sparkman — the short answer
Sparkman, Arkansas: USDA zone 8a, about 248 days between hard freezes, across 826 acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~248
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 826 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 8a is Sparkman's average, not your lot's — a low corner or a tree line moves it. Against Sparkman's 248-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sparkman
Each reading below is measured for Sparkman itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSparkman runs about 248 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSparkman sits in USDA hardiness zone 8a.
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 Sparkman is in
Sparkman sits in the South Central Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Sparkman's own centroid rather than borrowed from Dallas County.
What Grows in Sparkman
Every plant below cleared Sparkman's own zone 8a and its 248-day season. Each card opens that plant's Arkansas profile. How we score.
Is it too late to plant in Sparkman?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 17 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Sparkman
Closest first, within ~10 miles of Sparkman. Listing isn't leaking, and distance isn't exposure.
- SHELL SUPERSTOPUnderground Storage Tanks · 650 ft
- SPARKMAN SCHOOL DIST.Underground Storage Tanks · 800 ft
- RAY WHITE LUMBER COMPANYUnderground Storage Tanks · 800 ft
- SEALE'S SAW SERVICEUnderground Storage Tanks · 800 ft
- PIONEER OIL COMPANY #151Underground Storage Tanks · 800 ft
- SPARKMAN TEXACOUnderground Storage Tanks · 800 ft
- SPARKY'SUnderground Storage Tanks · 800 ft
- SPARKMAN CAMPUS BUS SHOPUnderground Storage Tanks · 900 ft
- 09S17W28DAB1Nitrate · 900 ft
- SPARKY'S FOOD MARTUnderground Storage Tanks · 2000 ft
- SPARKY'S 2Underground Storage Tanks · 0.8 mi
- 09S17W28ADB1Nitrate · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sparkman'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 Sparkman.
Severity Distribution
within ~10 miles of Sparkman
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sparkman, Nitrate runs higher than the national average — 14 sites within ~10 miles of Sparkman. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Sparkman
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 Sparkman average
Your land is one point inside Sparkman
Everything above resolves to Sparkman as a whole — one PHZM band and one 28°F frost record, read across 826 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 Sparkman Average
Sparkman Average
- ●USDA Zones 8a, averaged across Sparkman
- ●One soil character for all of Sparkman
- ●Frost dates read at Sparkman's scale: Mar 14 to Nov 17
YOUR Parcel
- ✓Your exact zone, not Sparkman's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sparkman
Pull a site-specific report for your exact address in Sparkman, Arkansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sparkman averages can't show:
We read public map data around Sparkman — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sparkman average
How we know this about Sparkman
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 Sparkman’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 Sparkman
When does frost risk typically end in Sparkman?
The last hard freeze (28°F) in Sparkman typically lands around Mar 14, 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 Apr 4.
When is the first frost in Sparkman?
The first hard freeze (28°F) in Sparkman typically arrives around Nov 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 3, so the watching starts about Oct 18 — about 248 days after the spring freeze cleared.
How long is the growing season in Sparkman?
Measured between 28°F hard freezes, Sparkman sees about 248 frost-free days — roughly Mar 14 through Nov 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 4 to Nov 3, about 213 days.
Is the soil safe to grow vegetables in Sparkman?
The federal record around Sparkman is light — 26 documented sites across the 9 federal source types we checked, mostly Nitrate entries (14), the nearest Underground Storage Tanks record about 0.1 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 Sparkman?
From about Oct 18 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 Nov 17 (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 Nov 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sparkman's scale — its 8a band and its 248-day season. Your yard writes its own version of Sparkman'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 Sparkman’s own scale
6 of the readings below were taken at Sparkman's own scale — its own ~248-day season between 28°F freezes, the 826 acres it covers and 26 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sparkman's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Sparkman's own 28°F hard-freeze dates, about Mar 14 and Nov 17 and the ~248-day span between themNOAA 1991–2020 Climate Normals
- 26 documented contamination sites on the federal record near Sparkman, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Sparkman's boundary and the 826 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~248-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sparkman's own centroid, the South Central PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sparkman's 826 acres read through its county's SSURGO summaryfrom Dallas County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Dallas County
- The growing challenges every Arkansas grower plans around — written at state scale, so they stay on the state guidefrom Arkansas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Dallas County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sparkman's 826 acreswhy one lot differs from the next →
- Which side of Sparkman you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 826 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Sparkman-wide figureread your own land →