Harvest · Signals, not a promise
When to harvest sweet potatoes
When to harvest sweet potatoes here is cited size, vine-cut, calendar, and frost cues. Those notes are not how long yours keeps.
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.
Illustrative photograph — harvest signals stay on the cited sheets.
Growing lives on growing sweet potatoes.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1322 (South Carolina)
30 percent of roots larger than 3½ in. Harvest before frost. Cut and remove vines before digging.
Details and limits (2)
Harvest
Clemson HGIC 1322 (South Carolina): harvest when 30 percent of the roots are larger than 3½ inches in diameter. Harvest before frost. When harvesting, cut and remove the vines before digging. Cue — not a keeping promise.
Limit
South Carolina HGIC 1322. Size and vine-cut cues stay Clemson. Not storage.
Maryland Extension (Maryland)
Harvest at eating size and before a frost. Cut vines first.
Details and limits (3)
Harvest
Maryland Extension (Maryland): harvest roots as soon as they reach eating size and before a frost. Digging is easier if you cut the vines off first. Cue — not a keeping promise.
Harvest
Maryland Extension (Maryland): if the vines are exposed to frost, dig the roots immediately. If immediate digging isn’t possible, cut away vines. Cue — not a frost-safety or keeping promise.
Limit
Maryland growing-sweet-potatoes sheet. Size and vine-cut cues stay Maryland. Not storage.
Maryland Extension (calendar) (Maryland)
Mid-September through October for roots. Maryland calendar — not a ZIP tool or keeping promise.
Details and limits (2)
Harvest
Maryland Extension (Maryland): mid-September through October for roots. Maryland calendar — not a ZIP tool or keeping promise.
Limit
Maryland vegetable planting calendar. September–October window stays Maryland. Not storage.
Illinois Extension (Illinois)
Dig the main crop around first frost. Spading fork or stout shovel. If frost, cut vines immediately and dig as soon as possible.
Details and limits (3)
Harvest
Illinois Extension (Illinois): dig the main crop around the time of the first frost in the fall. Use a spading fork or stout shovel. Cue — not a keeping promise.
Harvest
Illinois Extension (Illinois): in case of frost, cut the vines from the roots immediately, and dig as soon as possible. Cue — not a frost-safety or keeping promise.
Limit
Illinois sweet-potato page. First-frost dig and vine-cut stay Illinois. Not storage.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
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How do you know when sweet potatoes are ready to harvest?
Compare cues on the cited sheets. Clemson HGIC 1322 (South Carolina): 30 percent of roots larger than 3½ inches; harvest before frost; cut and remove vines before digging. Maryland: eating size and before a frost; cut vines first. Illinois: dig the main crop around first frost.
Do the sheets agree on a cue?
No. Size, vine-cut, calendar, and frost notes stay on their own cards — not averaged.
How we know — methodology. Ranges and assertions are cited per source, not blended.