Most Georgia gardeners set sweet potato slips in the ground from late April into early June, once the soil has warmed. Slips are rooted sprouts cut from a mature root, and they stall in cold dirt. The last spring freeze can come as late as the end of March, so the planting window opens well after it.
The short answer for Georgia
Plant slips about a month or more after the last spring freeze, which puts the start of planting in late April and the end around mid-June. The freeze date only tells you when the cold danger is over. Sweet potatoes also want warm soil and warm nights before they grow.
What do Georgia’s frost dates mean?
At the Atlanta reference station, NOAA’s 1991-2020 Climate Normals put the last spring frost between March 11 and March 29. The first fall frost falls between November 13 and December 1. Both ranges come from the 30 to 70 percent band of 32°F freeze probabilities. Inside that band, the odds of a freeze are neither remote nor certain. A freeze after March 29 is uncommon but possible, and a freeze before November 13 happens in some years.
Atlanta’s airport is an urban heat island, so those dates are friendlier than what many gardens see. North Georgia and the mountains freeze several weeks earlier in fall. The coastal plain runs milder.
How late can you plant sweet potatoes in Georgia?
Wait until the soil has warmed and the last frost has passed for most of the state. Most varieties need a long season from transplanting, and the fall freeze band starts November 13 at the reference station. A slip set in mid-June has time to size up roots before that. A slip set in mid-July is gambling on a late fall.
Sweet potato vines blacken at the first hard freeze, and roots left in cold, wet ground lose quality quickly. The days-to-maturity number on the slip order is your clock, and it runs backward from the fall freeze band, not forward from the spring one. Shorter-season types give you more room, and The Best Sweet Potatoes to Grow in Georgia covers which ones suit the state’s heat and season length. The broader Growing Sweet Potatoes in Georgia guide covers the rest of the season.
What will not work here
Does planting slips in March or early April work?
Rarely. A date that is past the average last freeze can still be a cold week for the soil. Slips set into cool ground sit without rooting, and a late freeze can still finish them, since the March 11 to March 29 band is a spread of odds rather than a hard stop. Waiting until the soil feels warm and nights stay mild costs a few weeks and saves the whole planting. Gardeners who want a head start can warm the bed with black plastic, but the slips still need frost-free nights.
Does watering once a week work?
Not for new slips, and not on sandy ground. The Atlanta reference station averages 35.8 days a year at 90°F or higher. Hot afternoons pull water out of leaves and soil fast. A freshly set slip has no roots to replace it, so it needs water every day or two for the first week or so, then less often as it takes hold.
Georgia’s summer rain looks generous on paper: about 13.6 inches across June, July and August, with June at 4.54 inches, July at 4.75 and August, the driest of the three, at 4.3. But much of it arrives as thunderstorms, and hard downpours on hot ground run off before they soak in. Sandy soil, common on the coastal plain, lets even a good rain drain through within a day. Red clay holds water far longer, which brings a different problem. These are normals for the station over 1991-2020, so a rain gauge on your own plot settles what your garden actually gets.
Does tight spacing work in a humid summer?
It backfires. Vines crowded into a bed in a wet, still summer keep their leaves damp for hours after every storm. Fungal problems and root rot get a head start, especially on heavy clay. Give the slips room between them and between rows so air can move.
Two more things fail in the same conditions. Slow varieties that need a very long season do not finish in north Georgia, where the fall freeze arrives early. And a long dry spell in late summer followed by a soaking rain can crack roots on clay soil, so even moisture matters more than heavy watering.
What changes across Georgia
Georgia spans USDA hardiness zones 6a to 9b on the 2023 USDA Plant Hardiness Zone Map, which uses 1991-2020 normals. That is a wide spread, from the mountains down to the coast, and there is no single planting answer for the whole state. The hardiness zone rests on the average annual extreme minimum temperature. Sweet potatoes are grown as a summer annual, so the winter low matters less to them than how warm the soil gets and how many frost-free weeks you have. The zone map is still a useful way to see how far your area sits from Atlanta’s conditions.
A gardener in the north Georgia hills or the mountains should shift the whole schedule toward the middle of the window. Wait until May, when the soil has warmed, and finish planting earlier than mid-June. The fall freeze comes several weeks before the Atlanta dates, so pick varieties with shorter days to maturity and skip the slowest ones. Higher elevation compounds this, because cold air settles into low spots and valleys, and a hollow can freeze while a nearby slope stays clear.
Down on the coastal plain the season stretches. Soil warms sooner and fall frosts come later, so the planting window can run a little longer at both ends. Sandy soil there also dries fast and holds little water, so watering matters more than it does in Piedmont clay.
To see which zone your own address falls in, use the USDA Plant Hardiness Zone Map and enter your ZIP code. Do not assume the zone for the nearest big city applies to your yard.
Where to check this for your own county
Your state extension service is the best next stop. University of Georgia Extension runs an office in nearly every county, staffed by agents who know the local soil, frost pockets and common sweet potato problems.
When you contact the office or browse its publications, look for two things. The first is a local vegetable planting calendar, which gives dates for your county rather than a statewide guess. The second is a list of varieties that have been trialled in your area. A variety that performs well in the coastal plain may not finish in the mountains, and county results show it.
A county recommendation beats a state one every time. A statewide calendar has to cover mountain valleys and Atlantic sand with the same few lines, so it works as a starting frame. If your county agent gives you a different date, trust the agent. Ask also about local soil testing, since a county lab report tells you whether the bed needs lime or lower nitrogen, which matters because too much nitrogen grows vines and few roots.
Checking this against your own garden
Your own observations outrank any date in print. Three are worth watching, and none needs a tool.
Soil warmth by feel. Push your hand a few inches into the bed on a mid-morning in late April. If the soil feels cool and damp against your skin, hold off. If it feels comfortably warm, like water from a tap left out in the sun, the bed is ready. Beds that warm early are usually sunny, sandy and sloped. Beds that stay cool are often shaded or low and heavy with clay.
New leaves after planting. Within a week or two of setting a slip, fresh leaves should unfold at the growing tip. If the slip only holds its old leaves, or they yellow, the roots have not taken, and the soil or nights are probably too cool. Quick leaf growth tells you the spot is warm and well drained.
Where frost shows up. Notice which corners of your yard get frost first in fall and last in spring. Tomato leaves or tender annuals that blacken in a low spot while others stay green mark a frost pocket. Plant sweet potatoes away from it, and use that corner’s first frost as your cue to dig.
If you follow the almanac, here is when to plant sweet potatoes by the moon. It is a tradition, not a proven method.
Common questions
Can I plant sweet potatoes in Georgia in March?
It is too early for slips. The last spring freeze at the Atlanta reference station falls between March 11 and March 29, and the soil is still cold afterward. Start slips indoors if you want them ready, and move them outdoors in late April or May.
What is the latest date to plant sweet potatoes in Georgia?
Mid-June works for most of the state. South Georgia can sometimes stretch a little later, while north Georgia should finish sooner because its fall freeze comes earlier. The goal is to leave the full days to maturity before the first freeze.
Should I go by the last frost date or by soil temperature?
Use the frost date to rule out the cold and soil warmth to choose the day. Sweet potatoes want soil that is warm to the hand and nights that stay mild. A warm week in early April does not make it planting season.
How long do sweet potatoes take to grow in Georgia?
Most varieties take a long season from transplanting slips. Check the days to maturity for the variety you buy, and count back from the fall freeze band, since the first freeze at the Atlanta reference station can come as early as November 13 and arrives sooner in the mountains.