The best time to bring plants inside for the winter is when evening or nighttime temperatures consistently drop to around 50 degrees Fahrenheit (10 degrees Celsius) or lower. Many sources suggest bringing plants indoors once temperatures fall between 45 to 55 degrees Fahrenheit (7 to 12 degrees Celsius), as most tropical and tender plants can be damaged by colder temperatures below this range. Bringing plants in too late risks frost damage, while bringing them in too early may cause shock, so gradually acclimating plants by moving them closer to shelter before full indoor transition is recommended. This temperature guideline applies to most common houseplants and tender outdoor plants, with some variation depending on the plant species. In summary:
- Start watching evening/night temperatures in the fall.
- Move plants indoors when temps reach consistent lows of 45-55°F (7-12°C).
- Tropical plants should come in earlier, around 50°F or just below.
- Acclimate plants gradually by moving them to sheltered outdoor spots before fully indoors.
This approach helps prevent cold damage and shock, ensuring healthy plants through the winter.
