Harrisburg, Arkansas, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Harrisburg, 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 Harrisburg 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 Harrisburg — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Harrisburg — the short answer
Harrisburg, Arkansas: USDA zone 8a, about 264 days between hard freezes, across 2K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~264
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City 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 8a is Harrisburg's average, not your lot's — a low corner or a tree line moves it. Against Harrisburg's 264-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Harrisburg
Each reading below is measured for Harrisburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHarrisburg runs about 264 days between hard freezes — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHarrisburg 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 Harrisburg is in
Harrisburg sits in the Mississippi Alluvial Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Harrisburg's own centroid rather than borrowed from Poinsett County.
What Grows in Harrisburg
Every plant below cleared Harrisburg's own zone 8a and its 264-day season. Each card opens that plant's Arkansas profile. How we score.
Is it too late to plant in Harrisburg?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 25 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Harrisburg
Closest first, within ~10 miles of Harrisburg. Listing isn't leaking, and distance isn't exposure.
- ROY PRINCE'S TEXACOUnderground Storage Tanks · 200 ft
- 11N03E25ABA1Nitrate · 300 ft
- THOMAS, KELLYUnderground Storage Tanks · 600 ft
- HARRISBURGUnderground Storage Tanks · 600 ft
- BROWN FARMSUnderground Storage Tanks · 600 ft
- WRIGHT, B & J FARMSUnderground Storage Tanks · 600 ft
- JR FOOD MART 106Underground Storage Tanks · 750 ft
- MAPCO EXPRESS #7317Underground Storage Tanks · 950 ft
- A. A. JOHNSONUnderground Storage Tanks · 1000 ft
- DOUBLEBEE'S #128Underground Storage Tanks · 1100 ft
- HARRISBURG WATER & GAS WAREHOUUnderground Storage Tanks · 1500 ft
- HARRISBURG CITY SHOPUnderground Storage Tanks · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Harrisburg'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 Harrisburg.
Total Sites
55
within ~10 miles of Harrisburg
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Harrisburg
Severity Distribution
within ~10 miles of Harrisburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Harrisburg, Underground Storage Tanks runs higher than the national average — 38 sites within ~10 miles of Harrisburg. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Harrisburg
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 Harrisburg average
Your land is one point inside Harrisburg
Everything above resolves to Harrisburg 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 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 Harrisburg Average
Harrisburg Average
- ●USDA Zones 8a, averaged across Harrisburg
- ●One soil character for all of Harrisburg
- ●Frost dates read at Harrisburg's scale: Mar 6 to Nov 25
YOUR Parcel
- ✓Your exact zone, not Harrisburg's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Harrisburg
Pull a site-specific report for your exact address in Harrisburg, Arkansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Harrisburg averages can't show:
We read public map data around Harrisburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Harrisburg average
How we know this about Harrisburg
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 Harrisburg’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 Harrisburg
When does frost risk typically end in Harrisburg?
The last hard freeze (28°F) in Harrisburg typically lands around Mar 6, 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 Mar 27.
When is the first frost in Harrisburg?
The first hard freeze (28°F) in Harrisburg typically arrives around Nov 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 11, so the watching starts about Oct 26 — about 264 days after the spring freeze cleared.
How long is the growing season in Harrisburg?
Measured between 28°F hard freezes, Harrisburg sees about 264 frost-free days — roughly Mar 6 through Nov 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 27 to Nov 11, about 229 days.
Is the soil safe to grow vegetables in Harrisburg?
The federal record around Harrisburg shows 55 documented sites, mostly Underground Storage Tanks entries (38), 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 Harrisburg?
From about Oct 26 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Harrisburg's scale — its 8a band and its 264-day season. Your yard writes its own version of Harrisburg'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 Harrisburg’s own scale
6 of the readings below were taken at Harrisburg's own scale — its own ~264-day season between 28°F freezes, the 1,553 acres it covers and 55 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Harrisburg's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Harrisburg's own 28°F hard-freeze dates, about Mar 6 and Nov 25 and the ~264-day span between themNOAA 1991–2020 Climate Normals
- 55 documented contamination sites on the federal record near Harrisburg, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Harrisburg's boundary and the 1,553 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~264-day seasonGrowable Ground crop-matching engine
- The ecoregion at Harrisburg's own centroid, the Mississippi Alluvial PlainUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Harrisburg's 1,553 acres read through its county's SSURGO summaryfrom Poinsett County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Poinsett 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 Poinsett County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Harrisburg's 1,553 acreswhy one lot differs from the next →
- Which side of Harrisburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,553 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 Harrisburg-wide figureread your own land →
More in Arkansas
Growing region
Nearby growing guides