In general, spring and fall are the best times to transplant hydrangeas. For gardeners in the north, spring is the best time. It will give your shrubs three seasons to establish in their new home before winter hits. For gardeners in the south, it’s the opposite. We suggest transplanting your hydrangeas in the fall, as summers tend to be more stressful than winters. Your shrubs will have three seasons to grow more roots before hot and dry summers arrive.