Pumpkin vine did not produce any pumpkins
Had 8 plants, had tons of flowers but no fruits on any of the vines developed. Had them in two different locations
Answer
You are not the only person who asked this question. The male and female flowers have to be open at the same time, with good weather and bees---all at the same time. If it is a very rainy few days when the two flower types are open, the bees may not be there to pollinate the flowers