Answer: Most colleges want students with at least two years in a language with a passing grade.
Explanation:
Depending on what type (ex; state, ivy, or community) of college you want to apply to your choice may differ. Try looking at the type of school you're interested in and what they require or prefer. If you want to go to a state school I think two years is good enough, there are many ways to make your college applications stand out with only two years of French. If you are worried maybe supplement your french class with courses related to computer science or clubs in your school. Hope this helps :)