Alabama · zones 7b–9a
When to plant sweet potatoes in Alabama.
Sow or transplant between May 1 to Jun 15 in a typical year, keyed to Alabama'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 Alabama 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.
Alabama spans more than one climate: Zone 8 is the most common zone, but the state runs 7b to 9a. 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.
Alabama growing notes
North Alabama's sandy ridges make sweet potatoes easy.
Two different Alabamas, two different beds
Sweet potatoes want loose, well-drained ground to push roots outward instead of fighting resistance, and Alabama offers two very different starting points depending on where your garden sits. The sandy hill soils around Cullman and the rest of the northern tier drain and warm fast with almost no amendment; gardeners there mainly need to avoid over-fertilizing with nitrogen, which grows enormous vines and small, disappointing roots.
South of the Fall Line, in the state's heavier Black Belt clay, the fix is mechanical, not chemical: hill the bed into a raised strip roughly 10 inches high before slips ever go in. Roots grown in flat clay tend to come out long, thin, and forked instead of the blocky shape you want; a proper hill is the difference between a good harvest and a frustrating one in that soil.
Georgia Jet earns its keep in a shorter window
Georgia Jet is worth seeking out here specifically because it matures in about 90 days, several weeks faster than a standard 110-day sweet potato, which gives you a cushion if a wet spring pushes your slip planting back. Beauregard remains the dependable standard if you would rather optimize for yield over speed, producing reliably in both the sandy north and the clay south.
Whichever variety you choose, hold slips back until the soil settles at a steady 65 degrees; a slip is not a germinating seed, so skip hunting for a specific probe depth and simply confirm the ground itself has warmed through. Slips set into cooler ground simply sit and sulk rather than dying outright, and those stalled weeks come straight out of your fall harvest weight. A cheap soil thermometer checked at the same time each morning for several days in a row is the only test that matters.
The weevil worth your attention, and the beetle that isn't
Colorado potato beetle is a nightshade pest of potato, tomato, and eggplant, and late blight concentrates on tomato and potato. Sweet potato is a morning glory relative, so neither the beetle nor the blight can touch it. Aphids do turn up here, clustering on tender new vine tips during a humid stretch, though hosing them off each morning for a few days is normally enough to keep them from spreading.
The pest Alabama growers actually need to watch for is the sweet potato weevil, a small reddish beetle whose larvae tunnel through roots and leave them bitter and unmarketable even in small numbers. Buy certified slips from a reputable source rather than saving your own year after year, rotate the bed to a spot that grew no sweet potatoes for at least 2 years, and pull and destroy any vine that shows a wilting runner with a small entry hole near the soil line.
In Alabama: watch for
The pests that find sweet potatoes here.
A middle-length season, about 228 frost-free days, means sweet potato overlaps sweetpotato weevil for a stretch each summer. Check plants every week or two and treat early.
Sweetpotato weevil
Narrow tunnels through roots, and a bitter taste that survives cooking.
Organic fix: Plant certified slips, rotate the bed, and destroy any vine with a wilting runner.
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: Alabama gives sweet potatoes about 228 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 Alabama: questions
When should I plant sweet potatoes in Alabama?+
In a typical Alabama 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 Alabama?+
Start seeds inside about 6 weeks before set-out: roughly Mar 20 to May 4 for a typical Alabama season.
What USDA zone is Alabama?+
Alabama spans zones 7b–9a, 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.