The Twilight series is set in the early 2000s, specifically in 2005. The action of the first book, Twilight, begins in early 2005, as Bella moves to Forks and meets Edward Cullen for the first time. The timeline of the series is relatively short, with most of the events taking place within a few months or a year. While the exact month and day are not given in the books, Bella likely arrives in Forks sometime in February or March.