Tennessee · zones 7a–8a
When to plant sweet potatoes in Tennessee.
Sow or transplant between May 15 to Jun 23 in a typical year, keyed to Tennessee's median last frost around Apr 8. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Potatoes dates for a typical Tennessee season.
1 · Start indoors
Apr 3 to May 12
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 15 to Jun 23
Keyed to the ~Apr 8 last frost. Sow 3" deep, 14" apart.
Harvest
~110 days later
~2.5 lb per plant over ~1 weeks.
Tennessee spans more than one climate: Zone 7 is the most common zone, but the state runs 7a 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.
Tennessee growing notes
West Tennessee's sandy ground was made for sweet potatoes.
The bottomland gives you a head start
The sandy loam and loess of West Tennessee's Mississippi bottomland is close to ideal sweet potato ground: loose, deep, and fast-draining, which lets the swelling roots expand freely instead of fighting compacted soil for shape. Gardeners working the Basin's heavier clay soils, or the rockier ridge ground further east, can still get respectable results, but a raised bed or a deeply worked, loosened row makes more of a difference there than it does out in the bottomland.
Beauregard remains the standard variety across the Mid-South for good reason: it is reliably productive, stores well, and tolerates a range of soil types better than many named varieties. Georgia Jet finishes faster if your season feels tight, though nothing about a Tennessee season should actually be tight for this crop, given how long the growing window runs here compared to most of the country.
Curing is not optional, and the numbers matter
A freshly dug sweet potato is starchy and bland; curing is what converts that starch into the sugar that makes the vegetable worth growing in the first place, and skipping the step or rushing it leaves you with a root that never develops proper flavor or storage life. Dig, then cure the roots for four to seven days at a steady 85 degrees, with the humidity sitting between 90 and 95 percent, and start that clock before the roots feel any chill.
A humid Tennessee September or October often supplies the humidity side of that equation without help, but the temperature side usually needs active help: a warm room, a heat mat under a covered tote, or a greenhouse with a thermometer, since a closed car in the sun can climb past 100 degrees and starts cooking roots rather than curing them. Once cured, move roots into storage at 55 to 60 degrees and treat 55 as a hard floor, not a suggestion; a refrigerator is the one place they should never go. Below that floor the root takes chilling injury you cannot see until you cook it, when the center stays hard no matter how long it bakes.
Watch the vine, not just the soil
Do not carry your Irish potato scouting habits over here. Sweet potato is a morning glory, not a nightshade, so Colorado potato beetle cannot touch it and the late blight that threatens potato foliage has no host in this crop either. What actually damages sweet potato is underground and quiet: wireworms, white grubs and the sweetpotato weevil chewing shallow tunnels and holes you mostly find at digging time rather than by watching the leaves. Above ground, aphids cluster on new growth at the vine tips rather than spreading evenly across the plant, so checking those growing points weekly catches an infestation while it is still small enough for a strong blast of water from the hose to knock loose.
The vines themselves are the best warning system for stress: leaves that wilt in the heat of the day but recover by evening are normal, while leaves that stay wilted after the sun goes down point to a root problem worth digging up and checking. Stay on top of weeds for the first six weeks after setting slips in the ground, because sweet potato vines eventually spread enough to shade out weeds on their own but cannot yet outcompete them while roots are still establishing. A row that stalls out and stops sending new runners during that stretch is more often losing a fight with weeds at the base than suffering a soil or nutrient problem, so check under the canopy before changing anything else.
In Tennessee: watch for
The pests that find sweet potatoes here.
A middle-length season, about 200 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: Tennessee gives sweet potatoes about 200 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 Tennessee: questions
When should I plant sweet potatoes in Tennessee?+
In a typical Tennessee year, sow sweet potatoes or set out transplants between May 15 to Jun 23, keyed to the state's median last frost around Apr 8. Your exact dates shift with your ZIP code and microclimate.
When do I start sweet potatoes seeds indoors in Tennessee?+
Start seeds inside about 6 weeks before set-out: roughly Apr 3 to May 12 for a typical Tennessee season.
What USDA zone is Tennessee?+
Tennessee spans zones 7a–8a, mostly zone 7. 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.