Planting timing · Warm-season
When to plant sweet potatoes
Plant sweet potatoes on the cited sheets — not on a national calendar month. Regional dates stay source-specific.
Growing guidance is general information. Timing, spacing, and care depend on cultivar, weather, soil, and local conditions. Check the sources and adjust the plan for your garden.
Spacing lives on the sweet potatoes hub. Timing stays on the cited sheets.
Types and spacing live on growing sweet potatoes.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1322 (South Carolina)
Well after last chance of frost. Soil above 65 °F. Piedmont May 1–June 15. Coastal April 15–June 15. Fall not recommended.
Details and limits (3)
Timing
Clemson HGIC 1322 (South Carolina): not planted until well after the last chance of frost in the spring. The soil temperature should be above 65 °F before planting. Static named-source frost and soil-temperature notes — not a national plant date.
Timing
Clemson HGIC 1322 (South Carolina): Piedmont May 1 to June 15. Coastal April 15 to June 15. Fall not recommended. South Carolina regions — not a national plant date.
Limit
South Carolina HGIC 1322. Coastal and Piedmont windows stay Clemson. Not a ZIP calendar.
Maryland Extension (Maryland)
Slips after soil 65 °F. After danger of frost has passed. Static named-source frost and soil notes.
Details and limits (2)
Timing
Maryland Extension (Maryland): plant sprouted new shoots (called slips) after the soil has warmed to 65 °F. Plant outside after the danger of frost has passed. Static named-source frost and soil-temperature notes — not a national plant date.
Limit
Maryland growing-sweet-potatoes sheet. 65 °F and after-frost wording stay Maryland. Not a ZIP calendar.
Maryland Extension (calendar) (Maryland)
Mid-April through mid-May, sprout slips indoors. Mid-May through mid-June, transplant rooted cuttings.
Details and limits (2)
Timing
Maryland Extension (Maryland): mid-April through mid-May, sprout slips indoors. Mid-May through mid-June, transplant rooted cuttings into the ground. Maryland calendar — not a ZIP tool.
Limit
Maryland vegetable planting calendar. Indoor and transplant windows stay Maryland. Not a ZIP calendar.
UMN Extension (Minnesota)
Outdoor early June (roots). Indoor mid-April (roots). Minnesota timing — not a national plant date.
Details and limits (2)
Timing
UMN Extension (Minnesota): recommended outdoor planting for sweet potatoes (roots) is early June. Indoor start of sweet potatoes (roots) is mid-April. Minnesota timing — not a national plant date.
Limit
Minnesota planting-the-vegetable-garden page. Early June and mid-April stay Minnesota. Not a ZIP calendar.
Illinois Extension (Illinois)
Transplant slips as soon as the soil warms after last frost. Illinois timing — not a national plant date.
Details and limits (2)
Timing
Illinois Extension (Illinois): transplant the slips as soon as the soil warms up after the last frost. Illinois timing — not a national plant date.
Limit
Illinois sweet-potato page. After-last-frost timing stays Illinois. Not a ZIP calendar.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
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When a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
When do you plant sweet potatoes?
Compare timing on the cited sheets. Clemson HGIC 1322 (South Carolina): well after the last chance of frost; soil above 65 °F. Maryland: slips after 65 °F, after danger of frost has passed. Minnesota: outdoor early June. Illinois: transplant slips as soon as the soil warms after last frost.
Do the sheets agree on a window?
No. Each named source keeps its own frost, soil, and date notes. Cards stay separate — not averaged.
What to record in the Field Book
Save the bed with the crop and the date. You may add a photo and notes. Compare entries you have recorded with each other — not with a diagnosis from this page. If you want an identification, bring the record to local Extension.
How we know — methodology. Ranges and assertions are cited per source, not blended.