If you're eating yellow squash (the small, yellow ones), it's only like 4g per cup. Butternut, on the other hand, is like 13g per cup. Make sure you look up the exact kind you're eating.

On days that I have yellow squash I consume one per meal. One yellow squash cut up gives me about a cup, sometimes I can get 2 cups if it is a really big yellow squash. I've been shooting for about 2/3-1 cup of vegetable per meal.
I really like it shredded, sauteed in a little olive oil and put in an omelet with spinach. Yummy dinner.
I use fitday.Com to determine the carb, fat, protein content of what I am eating.

That does sound quite good actually, I grew to hate them because I was eating them plain with some garlic salt.