Planting timing
When to plant potatoes
Plant potatoes when soil has warmed 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.
Dates and soil notes stay on the named cards below — not one planting window.
Plant when soil has warmed on the cited sheet. Spacing lives on the potatoes hub.
Types and spacing live on growing potatoes.
What the sources say — at a glance
One source per card. Facts are not averaged.
Maryland Extension (Maryland)
Half-hardy. Mar 15–May 1. Soil ≥45 °F. Early types through June 1. 90–120 days. Green sprouting: dark, then light, then cut.
Details and limits (5)
Timing
Maryland Extension (Maryland): half-hardy annual. They can withstand light frosts, but not heavy frosts or freezing. Plant from March 15 to May 1 depending on your location. The soil temperature should be at least 45 °F. Maryland’s attributed hardiness wording — not a planting-safety promise. Timing on their sheet — not a national plant date.
Succession
Maryland Extension (Maryland): seed potatoes of early-maturing varieties can also be planted through June 1. Maryland sheet — not a national plant date.
Maturity
Maryland Extension (Maryland): days to maturity 90–120. Source range — not how long yours takes.
Method
Maryland Extension (Maryland): green sprouting — keep whole tubers in the dark at room temperature until they sprout. Then expose tubers to light. Cut into seed pieces and plant. Maryland method — not a BioArva protocol.
Limit
Maryland potato garden page. March 15–May 1, June 1, 90–120 days, and green sprouting stay Maryland. Not a ZIP calendar.
UMN Extension (Minnesota)
When soil warms. Twin Cities early April; south earlier; north to May.
Details and limits (2)
Timing
UMN Extension (Minnesota): plant seed pieces as soon as the soil warms. This period is early April in the Twin Cities area of Minnesota. Gardeners in southern Minnesota may plant earlier, while locations further north may not have warmer soil until May. Minnesota timing — not a national plant date.
Limit
Minnesota potato sheet. Twin Cities early April is Minnesota geography. Not a ZIP calendar.
Illinois Extension (Illinois)
Cool-season. No tuber set at 80 °F soil. Mar–early Apr; mid/late to July 1. Soils dried and warmed.
Details and limits (3)
Timing
Illinois Extension (Illinois): potatoes are a cool-season vegetable. Tubers fail to form when the soil temperature reaches 80 °F. Illinois soil note — not a national plant date.
Window
Illinois Extension (Illinois): early, midseason, and late varieties all may be planted in March or early April. Midseason and late varieties may be planted as late as the first of July. Medium-early plantings, when soils have dried and warmed, are listed on their sheet. Illinois timing — not a national plant date.
Limit
Illinois potato page. 80 °F soil, March/early April, and July 1 stay Illinois. Not a ZIP calendar.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
Verified suppliers only
No supplier on this page
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 potatoes?
Compare soil and calendar notes on the cited sheets. Maryland: March 15 to May 1 depending on location; soil at least 45 °F; early-maturing types through June 1. Minnesota: as soon as the soil warms; Twin Cities early April. Illinois: March or early April; midseason and late as late as July 1; no tuber set at 80 °F soil.
How many days to maturity?
Maryland Extension lists 90 to 120 days. Source range — not how long yours takes.
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.