Arkansas · zones 6b–8a
When to plant sweet potatoes in Arkansas.
Sow or transplant between May 1 to Jun 15 in a typical year, keyed to Arkansas's median last frost around Mar 25. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Potatoes dates for a typical Arkansas season.
1 · Start indoors
Mar 20 to May 4
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 1 to Jun 15
Keyed to the ~Mar 25 last frost. Sow 3" deep, 14" apart.
Harvest
~110 days later
~2.5 lb per plant over ~1 weeks.
Arkansas spans more than one climate: Zone 8 is the most common zone, but the state runs 6b to 8a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Arkansas growing notes
Sweet potatoes fit Arkansas like they were bred for it.
Slips, not seeds, and warm soil only
Sweet potatoes start from slips, which are rooted vine cuttings, never from seed, so there is no germination threshold to clear the way there is with a seed-grown crop. You can buy bundles in May or sprout your own from a store sweet potato suspended in water for 6 weeks. Hold off until frost danger has passed and the ground itself feels warm to the wrist, roughly 65 degrees. Slips set in cold soil sit and sulk, and the lost weeks come out of your harvest.
Beauregard is the variety to beat: bred at LSU for exactly this region, roughly 90 to 100 days, dependable in clay-tinged soils, and still the commercial standard 40 years on. Centennial is the old Arkansas favorite for flavor. Either one wants a ridge of loose soil 8 to 10 inches tall; in heavy flat ground the roots grow long, thin, and stringy instead of blocky.
What eats them here
In Arkansas the underground threats are wireworms and white grubs, both worst in ground that was lawn or sod within the last 2 years. The test is a shovelful before planting: more than 2 grubs per spadeful means pick a different bed or expect scarred roots. Rotation does most of the work; sweet potatoes following sod is the classic mistake.
Above ground, deer treat sweet potato vines like a salad bar and can strip a planting overnight. If deer walk your neighborhood, the vines need a fence, not repellent. The good news: modest leaf loss does not cost you much yield, because the plant carries far more leaf than it needs. It is the repeated stripping that starves the roots.
Curing is where the flavor comes from
A sweet potato dug in October is starchy and bland. The sweetness comes from curing: 5 to 7 days at 80 to 85 degrees with high humidity, which converts starch to sugar and heals every nick in the skin for storage. A bathroom with a space heater and a pan of water, or a covered porch during a warm spell, both hit the target.
After curing, store at 55 to 60 degrees and never in the refrigerator; below about 50 degrees the flesh develops hard white spots and an off taste that cooking cannot rescue. Cured and stored right, an Arkansas backyard crop keeps 6 months and tastes better in January than it did at harvest.
In Arkansas: watch for
The pests that find sweet potatoes here.
A middle-length season, about 225 frost-free days, means sweet potato overlaps wireworms & white grubs for a stretch each summer. Check plants every week or two and treat early.
Wireworms & white grubs
Shallow holes and grooves chewed into the roots, found only at digging time.
Organic fix: Avoid planting into ground that was in sod last year; rotate away from grassy beds.
Clusters on the tender growing tips of new vines.
Organic fix: Hose them off in the morning, or use insecticidal soap.
Black rot
Dry, firm dark patches on the roots, usually found at harvest or in storage, with a sweet fruity smell.
Organic fix: Start from clean slips cut well above the soil line, never save roots from a bad crop, and rotate 3 years.
Your season math: Arkansas gives sweet potatoes about 225 frost-free days, and it needs roughly 110 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting sweet potatoes in Arkansas: questions
When should I plant sweet potatoes in Arkansas?+
In a typical Arkansas year, sow sweet potatoes or set out transplants between May 1 to Jun 15, keyed to the state's median last frost around Mar 25. Your exact dates shift with your ZIP code and microclimate.
When do I start sweet potatoes seeds indoors in Arkansas?+
Start seeds inside about 6 weeks before set-out: roughly Mar 20 to May 4 for a typical Arkansas season.
What USDA zone is Arkansas?+
Arkansas spans zones 6b–8a, mostly zone 8. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many sweet potatoes plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.