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Commercial field guide · North Carolina

Growing sweet potatoes in North Carolina

Yes. North Carolina is a major commercial sweet potato state, with production concentrated in the Coastal Plain. Most commercial fields are transplanted from late May through June; the field’s soil warmth, planting stock and harvest plan determine the workable date.

Coastal Plain production focus

Growing for a home garden? See the general sweet potato guide.

Sweet potato field rows prepared for commercial production in North Carolina

Regional crop context

Sweet potatoes in North Carolina

USDA NASS · 2025

USDA NASS reported 93,000 acres planted and 92,000 acres harvested in North Carolina in 2025, with a statewide average of 205 cwt per acre. That is production context, not a field yield target.

Commercial planting base

93,000 acres planted

Average yield reported

205 cwt/acre

Harvested area

92,000 acres

Reported regional totals give production context; they are not a field-level yield estimate.

North Carolina Extension supplies the state production calendar and commercial spacing. Its detailed crop-management chapter focuses on organic production; organic weed-control examples are labeled as such below.

Step 1 of 7 · Assess

Check the field and production system before ordering slips

Plan around the Coastal Plain’s commercial system: slip supply, suitable beds, early weed control, field traffic, digging capacity and curing-room space must line up before transplanting.

6 topics still to verify· planning aid only, not a suitability score

Local crop-planning checks

Walk low spots after rain. Confirm the bedder can make stable rows and that water can leave the field.

Not reviewed

Check previous sweet potato, grass or pasture history, nematode results, wireworm pressure and known disease patches.

Not reviewed

Confirm variety, slip quantity, delivery date, setter capacity, water at planting and a plan for keeping slips shaded before setting.

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Match variety and expected root size to the buyer’s fresh-market or processing specification, delivery timing and grading equipment.

Not reviewed

Confirm curing-room volume, airflow, pallet-bin handling and storage space before planting the acreage.

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Map the crop sequence and equipment-cleaning route so infested soil and plant material do not move between fields.

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Need a field-specific review? Run a coordinate-level farm audit for localized conditions.

Read the field history before selecting slips

Root-knot nematodes, wireworms and other soilborne pests affect marketable roots. Soil sampling, clean planting material, crop rotation and equipment sanitation are the first decisions; chemical treatment depends on current field results and product labels.

Step 2 of 7 · Plan

Choose a transplant window in North Carolina

Most commercial fields are transplanted from late May through June. The early and late bands are narrower, conditional options.

Early planting

Late April · limited

A limited early window is described for greenhouse-grown slips. NC State notes that planting early gives little advantage if cold weather continues into mid-May.

Main planting

Late May–June · main crop

This is the main commercial period. NC State targets completion by the end of June and reports that half the crop is planted by June 10.

Late planting

Early July · conditional

Some growers plant in early July when a shorter-season variety and favorable growing conditions leave time for the planned harvest.

Early plantingMain plantingLate planting

Historical regional climate

Monthly soil and air temperature context

1996-01-01 to 2025-12-31

Green tiles are months whose mean soil temperature is in the 77–86°F root-development range; all other tiles are neutral and show the value. Early, main and late badges mark the 10th, median and 90th-percentile dates for reaching 18.3°C for 4 consecutive days. Bar height shows the mean.

Early soil-warming date

April 05

10th percentile

Median soil-warming date

April 19

median year

Late soil-warming date

May 05

90th percentile

  • Early · 10th percentile
  • Main · median
  • Late · 90th percentile
  • 77–86°F root range
  • Cooler or warmer than the root range

June: regional monthly means

Modeled soil temperature
24.7°C · 0–7 cm model layer
Mean air temperature
25.3°C

Months whose historical mean soil temperature reaches the 65°F reference: May, June, July, August, September. Months in the 77–86°F root-development range: July, August. These are monthly regional averages, not planting dates or a frost check.

Open-Meteo · era5_land · 1996-01-01 to 2025-12-31 · Reference point 35.50°N, 79.40°W. Soil-temperature values are modeled at 0–7 cm model layer; the 65°F (18.3°C) transplant reference comes from a 4-inch field measurement. Use the regional calendar above with a current field reading.

Set the field date from a real soil reading

Sweet potato slips establish best after frost risk has passed and the soil is at least 65°F (18.3°C) at 4 inches. That is a field measurement; the climate strip above shows regional history.

Match the date to variety maturity

Use the regional crop duration and expected fall cutoff to choose a variety and harvest date. Confirm market grade, digging capacity and curing space before planting.

Step 3 of 7 · Prepare

Build an aerated bed and keep the crop sequence clean

Choose a warm, loose, well-drained field with a workable root zone. Sweet potatoes are widely produced on sandy-loam soils in North Carolina; waterlogged ground and a field with a damaging pest history can reduce marketable roots.

The bed does several jobs

  • Improves aeration and drainage around developing roots.
  • Warms the crop zone for a warm-season transplant.
  • Gives the setter and digger a consistent row to follow.

Keep bed height and shape consistent with soil texture, water movement and the equipment used on the farm.

Cross-section of a crowned sweet potato bed with arrows showing surface runoff moving down the shoulders.
A crowned, loose bed gives developing roots an aerated zone and can shed surface water down its shoulders. Shape the row for field soil, drainage and equipment; schematic, not to scale.

Set fertility from the field test

The 2025 North Carolina Extension manual lists sweet potato pH guidance and variety-dependent nutrient programs. Use the current soil-test recommendation for each field zone; excess nitrogen can favor vines over storage-root sizing.

Step 4 of 7 · Establish

Plant slips, not seed, and calculate the stand

Sweet potatoes are established from vegetative vine cuttings called slips. Buy clean, healthy slips in the target variety and quantity, and keep them shaded and moist until planting.

Sweet potato slip set diagonally with its shoot and leaves above the soil, at least three buried nodes, new roots and a 3–4 inch depth mark.
Set the slip so at least three nodes sit below the soil while the growing tip and leaves remain above. The 3–4 inch (7.6–10.2 cm) depth is a practical guide; node position is the key. Leaf shape varies by cultivar. Water after transplanting.

Regional starting pattern

Between rows
42–44 in (107–112 cm)
Within row
9–12 in (23–30 cm)
Transplant depth
3–4 in (7.6–10.2 cm)

NC State reports commercial row spacings from 36–48 inches, with 42–44 inches most common. In-row spacing ranges from 8–14 inches, with 9–12 inches common. Three to four inches with at least three nodes underground is a practical transplant-depth reference.

Planting calculator

Estimate slips for your field

Spacing-based count

Estimated slips

12,446

at 42 × 12 in

Estimate = field area ÷ row-by-slip spacing. Keep values within the published bounds, then match the starting pattern to equipment and target root grade. Headlands and replant allowance are not included.

Step 5 of 7 · Manage

Protect the establishment period and the root grade

The first weeks determine how evenly slips establish and how the crop competes. NC State identifies weed competition during storage-root initiation and root sizing as a major production risk, especially in organic systems. Scout early, then choose current control methods for the farm’s production system.

Get water onto the slip at planting

Water immediately after setting and maintain enough moisture for root establishment. Track rainfall and soil moisture; avoid keeping beds saturated.

Keep the field clean while the crop closes rows

Scout early and maintain a weed-free start through canopy closure. Choose current control methods for the farm’s production system.

Scout below the canopy as well

Wireworms, flea beetles and root-knot nematodes can downgrade roots. Keep field history and scouting records tied to each harvest lot.

Keep tools and planting stock clean

Use certified or otherwise clean slips, avoid carrying soil on slips, and clean equipment after infested fields to limit movement of nematodes and soilborne disease.

Step 6 of 7 · Harvest

Dig at the planned size, cure quickly and protect the skin

North Carolina harvest generally begins in late August and continues through October. Protect roots from cuts and skinning, then move them promptly into a controlled curing environment.

Tractor and mechanical digger lifting sweet potatoes into a harvest wagon
At harvest, protect the skin and move roots promptly to curing; equipment and handling systems vary by region.

Harvest period

Late August–October

Plan by variety, market size, planting date, field condition and frost risk.

Cure

85°F · 85–90% RH

Hold for 3–5 days with airflow; room design and incoming root temperature affect timing.

Store

55°F · 85–90% RH

Maintain stable temperature, humidity and ventilation after curing.

Step 7 of 7 · Reference

Evidence behind the North Carolina guide

View references (8)
  1. 1. NC State Extension — Crop Production Management: SweetpotatoesPublished 19 March 2024

    North Carolina planting dates, commercial row spacing, population, production risks, harvest timing and curing. Weed-management examples in this chapter are for organic production.

  2. 2. USDA NASS — Vegetables 2025 SummaryPublished 12 February 2026

    2025 North Carolina planted and harvested area, average yield and total production; statewide statistics, not an individual-farm forecast.

  3. 3. NC State Extension — Postharvest Handling of SweetpotatoesCommercial technical publication; reviewed 28 September 2026

    Harvest handling, curing temperatures and humidity, ventilation and storage conditions.

  4. 4. NC State Extension — Sweetpotato Root-knot NematodeExtension fact sheet; reviewed 28 September 2026

    Field history, soil sampling, clean planting material and equipment sanitation for North Carolina production.

  5. 5. Washington State University Extension — Sweetpotato Production PracticesPublished January 2026

    Crop-level transplant practice and the 77–86°F (25–30°C) soil-temperature optimum for root development; Western Washington planting dates are not used.

  6. 6. University of Missouri Extension — On-farm Sweet Potato Slip ProductionPublished 2021

    Commercial slip handling, the at-least-65°F soil reading at 4-inch depth and immediate irrigation; Missouri calendar dates are not used.

  7. 7. University of Missouri Extension — Growing Sweet Potatoes in MissouriReviewed March 2026; originally published September 2017

    Crop-level guidance for planting slips 3–4 nodes (about 3–4 inches) deep and using raised beds to support root development, drainage and aeration. Missouri dates are not used for this North Carolina guide.

  8. 8. NC State Extension — 2025 North Carolina Agricultural Chemicals Manual2025 edition

    North Carolina soil-test-based pH and fertility recommendations. The page directs fertility planning to a current soil test rather than prescribing a blanket field rate.

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