The first frost can arrive without warning in late October, and one cold night kills tender plants that thrived all summer. Don't let your favorites become casualties of an overnight freeze! These 12 plants need to come indoors before nighttime temperatures dip below 50°F. With the right spot, light, and watering routine, they'll cruise through winter and burst back to life in spring. 1. Tropical Hibiscus Bring tropical hibiscus inside when nights fall below 50°F. Place it in your brightest south-facing window for at least 6 hours of direct sun. Water when the top inch of soil dries out and mist the leaves weekly for humidity. Cut it back by a third so it fits indoors and saves energy for survival. Overwintering tip Expect some leaf drop at first — it's just acclimating. Hold off fertilizer until spring. 2. Geraniums Geraniums hate frost but overwinter beautifully indoors. Before the first freeze, trim leggy stems back by a third and check for pests. Set pots in a bright, c...