Rapid City, SD – A freeze warning has been issued for Harding and Northern Perkins counties from 3 a.m. to 9 a.m. Sunday, with temperatures expected to drop as low as 30°F. The National Weather Service warns that frost and freeze conditions could kill sensitive vegetation and damage outdoor plumbing. Residents are urged to take precautionary measures, such as covering plants or moving them indoors. Those with outdoor plumbing should consider insulating their pipes to prevent freezing.