Our gifted program does Geometry in 8th grade, Algebra II 9th grade, Trig/pre-calculus 10th grade, Calculus AP AB 11th grade, Calculus AP BC 12th grade. They also offer AP statistics thrown in there some year. You can take this math sequence if you are not in the gifted program but test in math at some level.
Our school district starts differentiating in 7th grade. If your child is in the lowest math class in 7th grade, they end up on a low track in high school, etc. Not good.