Katahdin

Potato

95d to harvest

Sink your spoon into the cloud-soft promise of Katahdin—its flesh turns creamy and luminous when cooked, with a gentle, true-potato sweetness and a fine, velvety texture. This white potato forms dependable, well-shaped tubers that roast up beautifully to a golden, crisp exterior while staying tender within. Grow Katahdin for hearty, everyday versatility in classic preparations, from rich mash and comforting casseroles to robust roasting and skillet-ready sides.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 15th
Transplant / Sow Outdoors	May 15th
Harvest Begins	Aug 18th
Harvest Ends	Sep 24th

Crop Details

Trait	Value
Days to Maturity	95
Sun Requirements	Full Sun
Growth Habit	Clumping
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	45
Min Night Temp (°F)	28
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease problem is most common on Solanum tuberosum (Katahdin potato), and how do I treat it?

Late blight is the most damaging disease to watch for in potatoes, especially with cool, wet weather. Remove and destroy any leaves showing dark, water-soaked blotches, and avoid overhead watering; then start a preventive potato fungicide labeled for late blight if conditions are favorable. For early detection, inspect plants every 3–4 days and improve airflow by spacing rows and keeping foliage off the soil as the plants grow.

How often should I water Katahdin potatoes during the main growing phase?

During active tuber bulking (roughly weeks 4–8 after emergence), keep soil consistently evenly moist, not soggy. Water about 1 inch per week total (more in heat, less in cool weather), aiming for moisture to reach 6–8 inches deep where tubers form. Let the top 1–2 inches dry slightly between waterings to reduce risk of rot and scab.

How can I tell when Katahdin (Solanum tuberosum) is ready to harvest?

Harvest at about 95 days, when the plants’ foliage has yellowed and begun to die back. For new-to-medium sized tubers, you can carefully dig one plant early, but for full-size harvest wait until the vines are mostly dead. After digging, cure potatoes for 1–2 weeks in a cool, dark, airy place to toughen skins for storage.