“Four years of math” typically means up to precalculus (the standard college-prep track of high school math puts 12th grade students in precalculus), although taking calculus is preferred if you complete precalculus earlier than 12th grade.
Having completed calculus BC in 11th grade should be fine, although if you are a Washington resident, you should take a math or other quantitative course (e.g. statistics, AP computer science, physics) in 12th grade to fulfill such a requirement that Washington public universities have.