They are probably male flowers. As far as i know the male flowers come out first fall off and then the female flowers will show up. The female flowers will have a little tiny fruit underneath the flower and wont fall off.

Here is a quick way to see male from female.

Here is a link that might be useful: Squash Blossoms falling off vine.

Thanks! Thatrs exactly what it is. I have them in raised beds in rich composed horse manure. I pick the bugs off daily & make sure they have plenty of water so Iv gone to allot of trouble raising these guys! I should have tons of winter squash from the looks of all the female flowers :)
Thanks again!