It called blossom drop. Google for more info but basically it means your plants are stressed. It happens to me in the heat of the summer but I believe cooler weather does it too.

Thanks, I have since found out what's going on with my tomato plants. The recent rains have caused Blossom In Rot in washing away the calcium. I hope the spray I purchased helps.

Thanks, I have since found out what's going on with my tomato plants. The recent rains have caused Blossom In Rot in washing away the calcium. I hope the spray I purchased helps.

i do not think it is blossom end rot. Blossom end rot usually appears on developing tomatoes and looks like the brown/rotting area on the bottom.