In Las Vegas it was curricular to learn Trigonometry in 7-8th grade; Might have changed since I moved, but I was learning trig in the end of 7th grade and as long as I was there for the 8th.
Was kind of disappointed when I found out Trig. was taught in the 10th grade where I live now; But then again only I and an advanced placed Freshman understood Trig., out of 35 students in class..