MANKATO (AP) -- Early frost a week ago has some farmers in southern Minnesota worried about this fall's harvest - which they were hoping to delay after a late spring thaw.

The impact of the frost has reportedly been different from field to field.

The farms that saw the most impact are in Sibley and Le Sueur counties.

Randy Rieke is general manager for the Farmers Co-op of Hanska.

He says he's expecting widespread impact because plants are still immature.

He says many farmers are struggling to find enough time for plants to grow.

He expects most Minnesota farmers will store the majority of their harvest, especially corn crops, in hopes of higher prices next spring.

He says the immature plants have more problems in long-term storage.