What kind of squash are we talking about? There are hundreds! Generally speaking if it doesn't start enlarging within a day or 2 after the flower closes it didn't get pollinated.

Also, be aware that there are some squash that don't need to be pollinated to develop fruit (but they will be seedless; if they're pollinated they'll have seeds). These are called parthenocarpic squash.

The easy way to know is to do it yourself by hand. Otherwise it is a wait and see experience.

Dave

Thanks for the responses everyone.

So I hand pollinated and got some mixed results. A few of them took and are developing but at least half just rotted off like I didnt even pollinate even though I definitely did. A couple of those females that didnt take has the blossoms knocked off accidentally because I was a bit rough but for those that has the blossoms intact that I did pollinate, is it possible that I just didnt give them enough pollen?

Is it possible that some can get pollinated but just still not want to develop?

I will definitely do it in the morning to see if that helps. When I attempted to steal the pollen from the Male plants they were all closed so I had to personally pull the flowers open.

If you pull a flower open on a male flower, I believe the pollen is not ready. Now, I should say that bees don't hesitate to burrow down into unopened flowers to get pollen. It's nutritious then, but just not fertile. Plants have evolved to be pretty smart about this. No sense exposing proto-pollen to the elements if it isn't able to do its job yet.

Not sure how you're doing manual pollination, but the way I do it is just to rip off an opened male flower (there are almost always lots more of these than they are female flowers) and just wazzle the stamen/anthers around inside a female flower. Takes just a few seconds. There are those who try to do this delicately with tiny paintbrushes and Q-tips. That's just silly.

Check the FAQ here on How to hand pollinate. If you have to force a
young male bloom open then the pollen may not be mature yet. Same for a
female ovary. If the weather is hot or humid the pollen is tacky and not
viable. Several different factors involved. Just as with all of life,
sex provides no guarantees of pregnancy. ;-)

Dave

Dan beat me to it. Thought I had posted this hours ago. But just showed up now.

Thank you gentleman!

I've been coming across another problem recently. Every time the plant throws out female flowers, it doesnt even get to the size where I am able to pollinate the fruit. It will just stay as small as a tic tac and eventually just fall off after browning and not even giving me the opportunity to pollinate it. This has happened to several of the most recent female flowers that have come up so I havent had any chance to even get new squash going. All I'm getting is new leaf growth because of this with no new squash

There are still many active male flowers, plenty of leaves, some added new leaf growth and two fruits ripening currently.

First photo you can see the female flower just stunting and not doing anything. This is the size that they have been maxing out at lately

How much sun is it getting? What's the soil like?

Well, wait. You said you WERE getting pollination, presumably with reasonably female flowers. Now all of a sudden you are not? In general, I'd look for plant stressors, but this sounds odd. These are allegedly female flowers for which the flower petals don't even open?

Shule, plenty of sun. At least 8 hours as Its in a prime spot in garden. Normal clay soil

Dan, yes, at least that's what I believe those are ... small female flowers that should turn to fruit if properly pollinated right?