Arkansas · zones 6b–8a
When to plant sweet corn in Arkansas.
Sow between Apr 1 to Jul 1 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 Corn dates for a typical Arkansas season.
Direct sow
Apr 1 to Jul 1
Keyed to the ~Mar 25 last frost. Sow 1.5" deep, 12" apart.
Harvest
~75 days later
~1 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
Arkansas sweet corn needs a block, and a plan for the humidity.
Block planting is not optional in Delta bottomland
Sweet corn is wind-pollinated: tassels shed pollen from above, and it has to rain down onto the silks below to fill out an ear. A single long row throws most of that pollen onto the ground beside it rather than onto neighboring plants, so plant at least 4 rows deep in a block instead of a strip, holding a tight 12 inches between plants in the row. In Arkansas's humid, often breezy Delta bottomland, a tight block also shelters silks from drying out in a hot wind, which cuts pollination just as surely as a lack of pollen does.
Arkansas's long frost-free stretch supports repeated sowings, so stagger plantings roughly 10 to 14 days apart rather than sowing everything at once; that spreads ear ripening out over weeks instead of dumping the whole harvest into one overwhelmed week, and it hedges against any single planting getting hit hard by weather or pests at a vulnerable stage.
Corn earworm comes in waves here, not one shot
Arkansas's long, warm season lets corn earworm run through 3 or more overlapping generations rather than the 1 or 2 a cooler northern state sees, so a single early spray does not cover the whole crop. The standard defense is one dose of mineral oil, applied with an eyedropper directly onto the silk mass where it bunches at each ear's tip, and timing decides whether it works: wait for the silks to wilt and brown, typically 3 to 7 days after they emerge and often most effective around day 5 to 8, then treat that ear once and move on to the next. Oiling silk while it is still green and actively pollinating, or dosing the same ear twice, seals off pollen delivery to the kernels and results in a bare, unfilled tip instead of a protected ear, so walk the block every few days and treat only whichever ears have just reached the wilted stage.
European corn borer and aphids round out the pest list here; borer larvae tunnel into stalks and are hard to reach once inside, so the practical defense is removing and destroying stalks after harvest rather than leaving them standing, which denies overwintering borers a place to spend the winter in your own garden.
The squeeze test beats guessing by eye
Silk color alone is not a reliable ripeness signal in Arkansas's humidity, since silks can brown early in a hot spell without the ear actually being full. The squeeze test settles it: press a kernel near the middle of an ear with a thumbnail, and milky white fluid means the ear is ready, clear watery fluid means it needs a few more days, and thick, doughy fluid means it has gone past its best and should come off regardless.
Pick in the cool of the morning when sugars are highest, since sweet corn starts converting its sugar to starch the moment it is cut, and that conversion runs faster in Arkansas's summer heat than in a cooler climate. Getting the ears out of the sun and into the refrigerator or onto ice within an hour of picking holds noticeably more sweetness than corn left sitting in a garden basket through a warm afternoon.
In Arkansas: watch for
The pests that find sweet corn here.
A middle-length season, about 225 frost-free days, means sweet corn overlaps corn earworm for a stretch each summer. Check plants every week or two and treat early.
Caterpillars feeding down in the tip of the ear.
Organic fix: A few drops of oil on the silk; Bt on the silks.
Broken tassels and frass-filled holes in the stalk.
Organic fix: Bt on young plants; cut and destroy stalks after harvest.
Clusters on the tassels and upper leaves.
Organic fix: Usually minor; insecticidal soap if heavy.
Fall armyworm
Ragged holes through the unfurling whorl leaves, with sawdust-like droppings down in the funnel.
Organic fix: Check whorls weekly before tassel; Bt or spinosad while the caterpillars are still small.
Cinnamon-brown powdery pustules breaking out on BOTH sides of the same leaf, lower leaves first, darkening as they age.
Organic fix: Water at the ground rather than overhead, and choose resistant varieties next season; sprays are rarely worth it.
Your season math: Arkansas gives sweet corn about 225 frost-free days, and it needs roughly 75 days to a first harvest. That fits about 16 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting sweet corn in Arkansas: questions
When should I plant sweet corn in Arkansas?+
In a typical Arkansas year, sow sweet corn between Apr 1 to Jul 1, keyed to the state's median last frost around Mar 25. Your exact dates shift with your ZIP code and microclimate.
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 corn 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.