"SpaceX plans to fly an unmanned spacecraft to Mars as early 2018. The flights would continue about every two years and, if all goes according to plan, would culminate with the first human mission to Mars in 2025, Musk told the Washington Post in June."
http://www.bloomberg.com/news/articles/2016-09-23/elon-musk-to-outline-his-plans-for-mars
http://www.bloomberg.com/news/articles/2016-09-23/elon-musk-to-outline-his-plans-for-mars