big beautiful yellow squash plants, but squash turning brown and shriveling up

Question

the squash reach anywhere from 3 to 5 inches and turn brown on the end and start to shrivel up

Answer 1

There are several possible causes for this. Here are a couple of articles that will offer you some avenues to explore for cause and solution: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm