Where I went to school, we started having multiple teachers in first grade, but in a much more limited sense than in Junior High/High school; it was basically one primary teacher, with a small amount of time for up to two other teachers. I'm actually having trouble remembering if which was a daily thing; I know that I actually missed most of third grade science because that class was with a different teacher, and I was doing blind people stuff during that time (somehow I didn't even notice until most of the way through the school year, since I brought home a different science book from the library every week just because I wanted to).

However, I wouldn't be surprised if this is not the norm; my VI teacher talked about her colleagues warning her that I'd start needing to travel between multiple classes, which left both of us kinda confused, but implies that most elementary schools don't do it that way. Even at mine, though, I'm not sure that the schedules between grades really lined up well enough for mixing it up to work very well.