How Many Days Before Prom Do I Need To Order A Corsage?

The best thing to do is to call the florist, that you plan to use, and ask them.  Sometimes the girl doesn't even know what color she is going to wear two weeks out.  (I didn't).
Ask how far out they need to make a corsage, but go ahead and order it as soon as you can, so that you are sure to get the flowers that you want.

I would place the order about 2 weeks prior to prom.  You want to give the florist time to order the flowers they will need to make your corsage.  If they receive a large volume of orders from the students at the last minute, they may run short of the flower or color you want.  If you place your order early, you are assured of getting exactly what you want.  This is such a special time in your life, I sincerely hope you have a wonderful, memorable experience.

A week or two before prom hope you have fun! :) as me as a friend :)