Similarly one may ask, how late can you plant mums in the fall?
The early to mid-spring is the best time to plant mums. Mums may die off and only last for a single year if added later in the year such as during the fall or the onset of winter. With proper care, they will become a perennial fixture in your flower garden.
Accordingly, can I plant potted mums in the fall?
Plant Them Anyway Technically, however, they can be planted in your garden any time before the first frost of fall. This means you can try removing the mums from your pot and planting them in the ground in the fall. Although your potted mums may look dead, they might just be dormant.
In cold regions, this is too late to plant mums and expect them to survive winter. The best time to plant fall purchased garden mums is the minute you buy them, which should be as soon as you see them for sale. Early planting—even as early as late August—helps plants develop a strong root system.