Experts and BHG readers answer.
Pots that won't break while outdoors during snow and icy winter days
Thanks for writing. You should be able to leave pots made from nonporous materials outdoors for winter, for example, metallic pots (if they're a naturally rust-resistant material or have been treated), wood, polyethylene (foam), and fiberglass.
---Justin, Senior Garden Editor, BHG.com