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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.
Your next step is to determine the recommended planting time for your climate. Since it takes potatoes two to three weeks to emerge from the ground, the earliest you should plant seed potatoes is two weeks before your last anticipated freeze date of 28 degrees Fahrenheit or lower.f you garden in areas that have hot summers be sure to plant your potatoes early, and to play it safe, choose varieties that mature in early-or mid-season. This is because potatoes do not do well when the temperatures climb into the 90s.