No. I think Ross is 5'7 or 5'8. At least that's what it says in many of the websites.
I think he's a little taller
Hes actually 6'0ft
In Pop Star it said that he's 6'0ft. I think that's right because his brother Rocky is 6'2ft and Ross is only a little shorter than him. He also probably isn't 5'10ft because his sister Rydel is 5'8ft and he is taller than her and their friend Ratliff in R5 is 5'11ft and Ross is taller than him.