Dewpoints this evening are ranging in the teens to the low 30s across the state. (The 10° dewpoint in Council Bluffs I think is false, surrounding stations are reporting dewpoints in the 15-19° range). This is indictive of what the nighttime lows will be tonight across the state. Readings will drop into the 20s to around 30 statewide tonight leading to widespread frost and freeze conditions. You have time to cover any vegetation (like flowers etc) that you want to save before you go to bed.