OMAHA, Neb. (AP) — Those in Nebraska and Iowa who’ve already planted their spring flora might want to bring them inside or cover them up overnight. The National Weather Service has issued a freeze warning for most parts of northeastern Nebraska and Monona County in western Iowa for Wednesday night into Thursday morning. A freeze warning means overnight low temperatures are forecast to drop as low as 28 degrees, with below-freezing temperatures expected for several hours.

Sensitive outdoor vegetation may be damaged or killed if left unprotected from the freeze. The service has also issued a frost advisory for east-central and southeastern Nebraska and much of southwestern Iowa. A frost advisory means overnight lows are forecast between 32 degree and 36 degrees.