@Houston1021, usually a little before April 1, I think. I just went back though the correspondence trail to when my D applied two years ago, and that year they sent out an email on Saturday, March 21, announcing that they would be sending out decisions the next day. A Sunday, kind of odd.
My D, homeschool 2015 graduate, took French III and IV from Keystone. We were extremely impressed with the courses, a lot of teacher-evaluated lessons, as opposed to fully-computerized ones, and an extremely reasonable price tag.
You should run a Net Price Calculator on the school website to get an idea of what your need-based aid would be if you were to apply for it. And as @Madison85 says, you need to find out how much your parents will pay for subsequent years, and see if this is a workable option for four years.