Oark, Arkansas, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Growers here do well with cabbage, prickly pear, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Oark, 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 Oark 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 Oark — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Oark — the short answer
Oark, Arkansas: USDA zone 7b, about 245 days between hard freezes, across 244 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~245
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 244 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 7b is Oark's average, not your lot's — a low corner or a tree line moves it. Against Oark's 245-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Oark
Each reading below is measured for Oark itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOark runs about 245 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
MeasuredOark sits in USDA hardiness zone 7b.
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 Oark is in
Oark sits in the Boston Mountains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Oark's own centroid rather than borrowed from Johnson County.
What Grows in Oark
Every plant below cleared Oark's own zone 7b and its 245-day season. Each card opens that plant's Arkansas profile. How we score.
Is it too late to plant in Oark?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 19 — 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 Oark
Closest first, within ~10 miles of Oark. Listing isn't leaking, and distance isn't exposure.
- OARK GENERAL STOREUnderground Storage Tanks · 2200 ft
- OARK PUBLIC SCHOOLSUnderground Storage Tanks · 1.8 mi
- SALUS C.D.O.Underground Storage Tanks · 7.8 mi
- OZONE TRADING POSTUnderground Storage Tanks · 7.8 mi
- FALLSVILLE STOREUnderground Storage Tanks · 8.3 mi
- 11N23W04BDA1Nitrate · 8.3 mi
- DEER SCHOOL DISTRICT NO. 21Underground Storage Tanks · 9.1 mi
- MCCORMICK'SUnderground Storage Tanks · 9.9 mi
Measured from Oark'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 Oark.
Severity Distribution
within ~10 miles of Oark
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Oark
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 Oark average
Your land is one point inside Oark
Everything above resolves to Oark as a whole — one PHZM band and one 28°F frost record, read across 244 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 Oark Average
Oark Average
- ●USDA Zones 7b, averaged across Oark
- ●One soil character for all of Oark
- ●Frost dates read at Oark's scale: Mar 19 to Nov 19
YOUR Parcel
- ✓Your exact zone, not Oark's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Oark
Pull a site-specific report for your exact address in Oark, Arkansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Oark averages can't show:
We read public map data around Oark — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Oark average
How we know this about Oark
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 Oark’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 Oark
When does frost risk typically end in Oark?
The last hard freeze (28°F) in Oark typically lands around Mar 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 Apr 9.
When is the first frost in Oark?
The first hard freeze (28°F) in Oark typically arrives around Nov 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 5, so the watching starts about Oct 20 — about 245 days after the spring freeze cleared.
How long is the growing season in Oark?
Measured between 28°F hard freezes, Oark sees about 245 frost-free days — roughly Mar 19 through Nov 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Nov 5, about 210 days.
Is the soil safe to grow vegetables in Oark?
The federal record around Oark is light — 9 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (7), the nearest Underground Storage Tanks record about 0.4 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 Oark?
From about Oct 20 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 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 Nov 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Oark's scale — its 7b band and its 245-day season. Your yard writes its own version of Oark'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 Oark’s own scale
6 of the readings below were taken at Oark's own scale — its own ~245-day season between 28°F freezes, the 244 acres it covers and 9 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Oark's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Oark's own 28°F hard-freeze dates, about Mar 19 and Nov 19 and the ~245-day span between themNOAA 1991–2020 Climate Normals
- 9 documented contamination sites on the federal record near Oark, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Oark's boundary and the 244 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~245-day seasonGrowable Ground crop-matching engine
- The ecoregion at Oark's own centroid, the Boston MountainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Oark's 244 acres read through its county's SSURGO summaryfrom Johnson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Johnson 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 Johnson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Oark's 244 acreswhy one lot differs from the next →
- Which side of Oark you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 244 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Oark-wide figureread your own land →
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