I'm growing pumpkins on uprights in raised beds. They are blossoming profusely and setting lots of pumpkins, but the little pumpkins are turning yellow and falling off. I am also having this problem with winter squash, which is growing right next to the pumpkins.
Certified GKH Gardening Expert
Squash and pumpkins are very similar and fruits fall off for the same reasons. With this in mind, here's an article that should help you: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm