I live in Okla City. Is it too early to plant Elephant Ear bulbs ?
Wait until the soil warms up. Putting a tropical plant in cool/cold soil is a recipe for bulb rot. But you can start your plant indoors and move it to the garden after your frost free date. Elephant ear can tolerate full sun if they get lots of moisture when temps go over 85 F. Here is more information: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ear-plants.htm