The best season to transplant established strawberry plants and runners from plants is late summer or early fall. Late August is usually the best time in most areas.
In late summer or early fall, strawberry plants are done producing and the berries are harvested for the season. The plants can be transplanted at other times of the year, but transplanting them at the end of the growing period maximizes the amount of berries the plants produce the following year. The specific time for transplanting may vary in extreme climates. Gardeners can transplant strawberries in cooler climates earlier, while gardeners in hot climates can wait longer to transplant.