Question: What is the best time to plant potatoes in our raised garden beds? Answer: Jonathan Foster, Special Project Assistant For reference, I include the UMaine Extension Planting Chart and Schedule, but as you’ll see you are already in the planting window for potatoes (5/1 -6/1 in central Maine, 10-14 days earlier for coastal areas). read more What is the best time to plant potatoes in our raised garden beds?