Hill Valley, California is a fictional town that serves as the setting of the Back to the Future trilogy and its animated spin-off series.In the trilogy, Hill Valley is seen in four different time periods (1885, 1955, 1985 and 2015) as well as in a dystopian alternate 1985.y 1955, as seen in the first two Back to the Future films, the area around the courthouse has developed into the downtown of Hill Valley. In front of the courthouse is a grass-covered town square, with stores, two movie theaters (Essex and Town), and cafes cafés on the surrounding. streets