There are 2 books in the Hattie series. The newest book is Hattie Ever After which came out in 2013.

1
Hattie Big Sky

Book cover of Hattie Big Sky
This Newbery Honor winning, New York Times bestseller celebrates the true spirit of independence on the American frontier.

For most of her life, sixteen-year-old Hattie Brooks has been shuttled from one distant relative to another. Tired of being Hattie Here-and-There, she summons the courage to leave Iowa and move all…
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2
Hattie Ever After

Book cover of Hattie Ever After
After leaving Uncle Chester's homestead claim, orphan Hattie Brooks throws a lasso around a new dream, even bigger than the Montana sky. She wants to be a reporter, knowing full well that a few pieces published in the Arlington News will not suffice. Real reporters must go to Grand Places,…