She grew up in the Pennsylvania countryside, the second of four daughters. She has a Bachelor's Degree from Williams College and a Master's degree in Children's Literature from the Center for the Study of Children’s Literature at Simmons College in 2003. She's worked as a dog runner, a packer in a candy factory, an editorial assistant, a legal assistant, and a freelance writer.  In 2017, she began working in an office outside her home, and she is still writing all of her novels by hand.
Her third book, Bitterblue, was released in May 2012. All three books were a part of the Graceling Realm series which has sold more than 1.5 million copies and has been translated into 33 languages.
Her latest book is Jane, Unlimited, which was released in September 2017. Jane, Unlimited is her first published novel that takes a step away from the Graceling Realm, and is told in multiple genres.
Kristin has also written professionally for textbooks, and teacher editions, as well as for The Horn Book Guide.
- Graceling, 1 October 2008
- Fire, 5 October 2009
- Bitterblue, 1 May 2012
- Jane, Unlimited, 19 September 2017
- "Kristin Cashore Books, Author Biography, and Reading Level | Scholastic". www.scholastic.com. Retrieved 2018-05-26.
- "Kristin Cashore | Penguin Random House". www.penguinrandomhouse.com. Retrieved 2018-05-26.
- "BookExpo 2017: Kristin Cashore Takes a Break". PublishersWeekly.com. Retrieved 2018-05-26.
- "A Short Bio". This Is My Secret (personal blog). February 28, 2008. Retrieved 2009-04-04.
- "My books". This Is My Secret. February 28, 2008. Retrieved 2009-04-04.
- "Kristin Cashore". Amazon.com. Retrieved 2009-04-04.
- "Q & A with Kristin Cashore". PublishersWeekly.com. Retrieved 2018-05-27.