Regional propane shortages are occurring throughout the Upper Midwest as farmers work to bring in a wet, late-maturing corn crop.

Late planting and cool early-season temperatures delayed the development of this year’s corn crop, which has forced farmers to run propane-fueled dryers to bring the crop down to 15 percent moisture for long-term storage.

Many farmers said they will have to dry every bushel this fall as grain moisture remained above 20 percent into late October and little...