Are you checking soil temps?
Things are going to get very hectic, very soon. Many things factor into when corn starts to get planted…calendar date, precipitation, weather forecasts, etc. Interestingly enough, the only thing your corn seed cares about is soil temp and moisture. Most farmers have a good resource they use to evaluate soil temps and when is a good time to start planting. In the areas I support, SW MN, SD, and NE, soil temps range anywhere from 48 to 60 degrees. While your own soil thermometer is probably the best, I thought I would throw out a couple of resources to evaluate soil temps for producers in the West.
South Dakota: https://climate.sdstate.edu/
Remember, 50 degrees F is the magic temperature when corn starts to germinate!