What variety did you plant
When did you plant
What layout did you use for planting
Marilynne, I was going to ask these same questions....
do you know the "days to maturity" for your variety? Although not set in stone, especially for us northerners, it seems, that will give you an idea of when you should expect it to be ready to harvest. This actually seems early to me for any kind of sweet corn that I've ever grown, so maybe you just need to wait a while.