Winds NNE at 10 to 15 mph. Evening: Cloudy skies this evening will become partly cloudy after midnight. Low 44F. Winds ESE at 5 to 10 mph.
But it can take 70-90 or more for potatoes to mature. This depends on the variety. The potatoes can carefully be harvested at 7-8 weeks for a early harvest of small potatoes. For full grown potatoes you would harvest in the fall when the leaves turn brown. But it can take 70-90 or more for potatoes to mature.
Growing Potatoes: Early, Midseason and Late Varieties. Potatoes vary in size, shape, color, texture and time to maturity. Maturation time is the most important variable, because potato tubers grow best when soil temperatures range between 60 and 70 degrees Fahrenheit.