Wash new cast iron skillets in hot and soapy water before you season them. Dry the skillet with a lint-free towel.
Pour vegetable oil onto a soft washcloth to dampen it. Rub the washcloth over the interior and exterior of the pan to coat it completely.
Place the pan upside down on a cookie sheet lined with aluminum foil.
Heat the oven to 350 degrees Fahrenheit.
Place the cast iron skillet in the oven. Heat the skillet for 1 hour and then turn the oven off so it can cool.
Wipe the inside of the cast iron skillet with paper towels to remove the excess vegetable oil.
Place a paper plate or paper towel between stored cast iron skillets to absorb any remaining moisture.