- Tonight: a low around 27F.
- Monday Night: low around 24F.
- Tuesday Night: low around 20F.
- Wednesday Night: low around 26F.
- Thursday Night: low around 30F.
Most temperate Bonsai are grown outdoors and only occasionally some are brought indoors for about three days. Leave them outdoors as much as possible. They need to go through their seasonal changes (dormancy). Pines can easily be killed by being brought indoors ever. Learn the Hardiness Zones for each type of tree that you grow. Some trees are hardy to 20 degrees F (Pines, Maples, Junipers). Others are less hardy only to freezing (Serissa, Carissa, Sweet plum). Some tender tropical trees need to be kept above 45 degrees F. Azaleas are hardy to only 25 degrees F. Shield bonsai from strong winter winds that dry out the foliage and twigs. Because bonsai are planted in shallow containers the roots can freeze faster than they would if planted in the ground.
Also protect the pots. Freezing and thawing and freezing and thawing can cause pots to crack. Freezing and thawing can cause the glazing on pots to shatter.