Widespread frost and the chance for a hard freeze remains high in the overnight and morning hours through Thursday across south central Iowa. Low temperatures dropping below freezing may be harmful to plants and outdoor pipes. After cold air in the morning Thursday, more spring-like temperatures will return, as afternoon highs will approach the upper 50s and low 60s through Sunday, with an early week warm-up expected on the other side. Stay tuned to 92.1 KRLS for the latest weather information.