“Patchy” frost is predicted tonight as temperatures in some parts of Iowaare expected to plummet to 32 degrees. State Climatologist Harry Hillackersays it’s a bit early for Jack Frost to be making an appearance in Iowa.Hillacker says a September 21st frost date might in other years be ofconcern to farmers, but not this year as the crop is far enough along toescape frost damage.Hillacker says tomato season might be over, though. Tonight’s frost ispredicted for the northern half of Iowa, above Highway 30.