It's still early. I usually start planting sweet corn about May 15th. Even then the first crop doesn't always do that well. Two weeks later usually works better. Since I plant every two weeks until mid July, however, this time has some potential for an early crop. This year seems warmer, earlier, than most years have been. Plus, the soil temp is 20C which translates to 68F. The minimum soil temp for sweetcorn is 65F so in theory, we're good.
This soil thermometer has a Fahrenheit reading but it's inaccessible on the back of the thermometer. So I have to convert from Celsius.
These are the early types I'm trying this year. I tried Early Sunglow a number of years ago and didn't like it. It wasn't productive. However, this is a different location and maybe I'm better at it now. Trinity is a type I liked a lot in the past, but couldn't find seeds for a while. Seeds'n'Such seems to have some older varieties that I couldn't find elsewhere, so I bought them while looking at seed websites last winter.