When should potatoes be planted?

Plant when local field conditions are suitable for the cultivar and market. Regional dates, frost risk, soil temperature, moisture and seed condition differ, so the root guide does not give one calendar.

Should commercial potatoes be grown from seed?

This guide covers seed tubers or cut seed pieces used for field production. Use traceable certified planting stock that meets local and buyer requirements.

How far apart should potatoes be planted?

Spacing depends on cultivar, target tuber size, stem density and equipment. Iowa State’s commercial reference is 76–91 cm (30–36 in) between rows and 20–30 cm (8–12 in) between seed pieces.

How should harvested potatoes be stored?

Cure sound tubers with ventilation, then use a temperature and humidity suited to the market. Fresh-market, processing and seed lots are not interchangeable.

How to grow potatoes commercially

Commercial potatoes are grown from seed tubers or cut seed pieces and managed for a defined market such as fresh, processing or seed. Site, planting date, cultivar, spacing, irrigation, skin set and storage all depend on the region and buyer. Use the Iowa, California and Minnesota references below as separate examples, not one production prescription.

Scope: Commercial field production. Midwest field practices are drawn from the Iowa State guide; California production systems and Minnesota nutrient guidance provide regional contrasts. Confirm current local recommendations and buyer requirements. Updated 2026-10-16.

Ridged potato field with a center-pivot irrigation system — Irrigated potato field illustration.

At a glance

Planting material: Use certified, traceable seed tubers or cut seed pieces suited to the target market^1,6
Field choice: Well-drained soil, rotation and known disease and soil-pest history¹
Planting conditions: Use local seedbed, soil-temperature and moisture guidance; do not infer readiness from a climate average^1,7
Storage: Curing and holding conditions differ for fresh-market, processing and seed lots^5,1
Management: Hilling, irrigation, nutrition and crop protection depend on variety, soil, equipment and market^1,8

Planting and harvest calendar for Potatoes

Use the source-backed production windows to coordinate establishment, crop care and harvest. Production districts and cultivars can have different cycles; the historical climate adds context for the field plan.

Planting: Plant certified seed into a ready seedbed^1,2,3

No global planting months apply. Planting date depends on local frost risk, soil condition, cultivar, market, seed-lot condition and harvest target. The Iowa State commercial temperature and spacing references are one regional guide; use local field observations and extension timing.

Harvest: Harvest at maturity and buyer specification^1,4,5

Harvest depends on cultivar, market, skin set, soil moisture and temperature. California and Iowa sources describe different regional systems; inspect tubers and coordinate storage before lifting.

Select fields for drainage, rotation and market

Use field history: Review potato and related-crop history, disease, weeds, nematodes, wireworms and volunteer plants. Rotate and choose control options using current regional guidance and the target market.^1,9
Match the soil and machinery: Choose soil with suitable drainage and structure for tuber growth and harvest. Map headlands, row direction, irrigation and harvester access before settling the field layout.^1,3
Confirm the outlet first: Fresh-market, fry, chip and seed crops differ in cultivar, tuber size, harvest maturity and storage. Confirm contracts and storage specifications before seed purchase.^2,5,1

Prepare seed and establish an even stand

Midwest commercial seed-piece reference¹

Between rows: 76–91 cm (30–36 in) · Within the row: 20–30 cm (8–12 in)

Spacing from the Iowa State commercial guide. Adjust seed-piece size and spacing for cultivar, stem number, target tuber grade, planter and local recommendations. Schematic, not to scale.

Seed-lot handling sequence^1,6

1
Buy certified seed
Match cultivar and grade to the buyer.
2
Warm and inspect the lot
Follow local seed-handling guidance and remove suspect pieces.
3
Cut and sanitize
Use clean equipment and consistent seed-piece size.
4
Plant into a fit field
Check moisture, temperature and planter performance at seed depth.

Potato seed pieces laid along a planting furrow — Seed-piece placement before covering and hilling.

Use certified, traceable planting stock: Certification reduces seed-borne risk but does not replace inspection. Keep seed-lot records, handle tubers carefully and sanitize cutting equipment between lots.^1,6
Check actual soil conditions: The Iowa State guide’s commercial soil-temperature range is a regional reference. Check the seed zone and field workability directly; a regional historical climate panel does not confirm the condition of a managed bed.^1,7

Manage hilling, water, nutrition and crop health

Hill to protect developing tubers: Maintain soil cover over developing tubers to reduce greening and protect them from exposure. Timing and equipment depend on the production system and field conditions.^1,3
Irrigate with field measurements: Schedule irrigation from soil texture, rooting depth, crop stage, weather and measured soil water. Avoid both prolonged saturation and stress during tuber initiation and bulking.^1,10
Base fertility on soil and crop tests: Potatoes have specific nutrient demands and can lose quality from excess or poorly timed inputs. Use a soil test, crop history and local nutrient recommendations; Minnesota irrigated-soil guidance is a local reference, not a universal rate.^8,1
Scout and diagnose: Record foliar symptoms, insects, tuber defects and field conditions. Confirm the cause before treatment and follow local labels and integrated pest-management guidance.^1,9,4

Harvest carefully and store by market

Fresh-market harvest and storage flow^1,4,5

1
Sample tubers
Check size, maturity and buyer grade.
2
Confirm skin set
Use field checks and the local vine-termination interval.
3
Lift with care
Tune the harvester to limit cuts, drops and bruising.
4
Cure and hold
Use the temperature, humidity and ventilation for the market.

Harvested potatoes traveling along a mechanical harvester conveyor — Adjust the harvester to limit drops and tuber damage.

Check maturity in the field: Sample for skin set, size and buyer grade. Days after vine kill are a reference only; soil moisture, temperature and cultivar affect injury and storage quality.^1,4
Reduce harvest damage: Adjust digging depth, chain speed and transfer points to limit cuts and bruising. Keep suspect or wet lots separate from sound tubers.^4,5,1
Set storage for the contracted use: Fresh-market, fry, chipping and seed potatoes need different holding temperatures. Cure first, cool gradually and confirm the buyer’s protocol for the lot.^5,1

Frequently asked questions

When should potatoes be planted?: Plant when local field conditions are suitable for the cultivar and market. Regional dates, frost risk, soil temperature, moisture and seed condition differ, so the root guide does not give one calendar.
Should commercial potatoes be grown from seed?: This guide covers seed tubers or cut seed pieces used for field production. Use traceable certified planting stock that meets local and buyer requirements.
How far apart should potatoes be planted?: Spacing depends on cultivar, target tuber size, stem density and equipment. Iowa State’s commercial reference is 76–91 cm (30–36 in) between rows and 20–30 cm (8–12 in) between seed pieces.
How should harvested potatoes be stored?: Cure sound tubers with ventilation, then use a temperature and humidity suited to the market. Fresh-market, processing and seed lots are not interchangeable.

Regional guides and field planning

Estimate your margin Run a field audit

Sources and image credits

1. Iowa State University — Commercial Potato Production Guide — Revised February 2017. Commercial Iowa fresh-market production. Field practices and planting-temperature limits are explicitly transferred references on other regional pages.
2. UC Davis — Fresh-market potato production costs, Klamath Basin — 2023 study; published 2024. Historical Klamath fresh-market production budget: May planting, October harvest and 36-inch beds; not current field rates or prices.
3. UC Santa Cruz — Organic potato production — Reviewed October 2026. Central Coast commercial organic production: 48-inch beds, 8–12-inch spacing, 2–4-inch initial depth and hilling.
4. UC IPM — Harvest — Reviewed October 2026. Soil moisture, temperature and mechanical handling to reduce tuber injury.
5. UC IPM — Storage — Reviewed October 2026. Curing, ventilation, cooling and different holding temperatures for fresh, processing and seed markets.
6. USDA NASS — Minnesota crop progress, 04-28-25 — 2025 weekly report. 17% planted by April 27; five-year average 12%.
7. UC IPM — Seed certification and seed tuber handling — Reviewed October 2026. Commercial seed inspection, warming, cutting, sanitation and planting conditions.
8. University of Minnesota — Crop planning deep dive: pondering potatoes — Updated April 2026. Commercial vegetable-farm seed-piece size, density, disease prevention and handling.
9. UC IPM — Integrated weed management — Reviewed October 2026. California commercial district planting, Kern harvest/rotation context and early weed control.
10. UC IPM — Irrigation — Reviewed October 2026. Root distribution, available-water depletion and moisture management for commercial potatoes.

Image credits

Irrigated potato field illustration.
Seed-piece placement before covering and hilling.
Adjust the harvester to limit drops and tuber damage.

Photo sources and license details

Figures are published averages or study assumptions for the places named, not guarantees for your field. Check current local recommendations and product labels before acting.

Some visuals in this guide are illustrations rather than photographs of a specific farm. See image credits.