Cold Temperatures In general, mums are hardy in U.S. Department of Agriculture plant hardiness zones 5 through 9, although this can vary slightly by species. According to the USDA map, the lowest minimum temperatures mums can survive are right around 20 degrees below zero Fahrenheit.Click to see full answer. Accordingly, can mums survive a frost? Frost Protection Mums do not respond well to frosts and freezes, which may not occur until December or January in warmer areas. If you don’t want your mums to suffer damage, you can protect them by moving them to a sheltered area such a garage or porch if they are potted.Furthermore, can you keep potted mums inside? You can leave your garden mums in the ground during winter, especially with a layer of mulch in the cooler zones. However, because potted plants are more susceptible to cold damage, bring your mums indoors for winter safekeeping. Water mums so the soil is slightly moist during winter dormancy. Correspondingly, how long do potted mums last? Garden mums may be grown in containers, or planted in beds with existing shrubs and flowers. Flowers generally last about two or three weeks, depending on the outdoor temperatures and how far along the blooming process was when the plants were purchased.How do you take care of fall mums? How to Care for MUMs and Keep Them Blooming All Season Place your mums in a sunny area in your home. Find a window that allows lots of sun in and be sure it gets at least four hours a day of direct sunlight. Keep the soil moist. Deadhead often for lasting blooms. Once your mums stop blooming, you can place them in the ground outdoors once the weather starts to warm.