What is the lowest temperature house plants can tolerate?
Most houseplants are native to tropical areas and will not tolerate freezing temperatures. Many indoor plants will see damage when temperatures drop to the mid to lower 40s°F and nearly all will die if exposed to below freezing temperatures. Moving houseplants outside is a big change in environmental conditions, so acclimating them is important. Never move houseplants from indoors into full sun. Leaf burn, discoloration, and drop can occur. On some species, especially succulents, the damage to the fleshy stems and leaves is permanent.
What temperature is too cold for potted plants?
Many indoor plants will see damage when temperatures drop to the mid to lower 40s°F and nearly all will die if exposed to below freezing temperatures. Watch the weather forecast and bring plants back indoors well before nighttime temperatures get too cold. Roots of above-ground container plants can be the same temperature as the winter air. To be safe, go two zones colder with containerized plants, use larger pots (more insulation) and provide some protection. Water the plant well before the soil freezes.