Kate Hosford grew up in Waitsfield, Vermont, and attended Amherst College. After Amherst, she studied at the University of  Göttingen in Germany on a Rotary scholarship. In 1990, she began her career as a foster care worker in Brooklyn, and later became an elementary school teacher at schools in New York, San Francisco, and Hong Kong. After completing a two-year illustration degree at Pratt, Kate eventually decided that she would rather paint pictures with words, and turned her focus to picture books.

In 2011, Kate completed her MFA in Writing for Children & Young Adults at VCFA.  Since then, she has published five picture books and two poetry collections on topics such as circus chefs, the meaning of infinity, and the science behind how animals sleep. Her books have been published in seven languages and have won numerous awards and honors, including a Junior Library Guild selection, an American Library Association Notable Book winner, a New York Times Best Illustrated Book winner, and a Bank Street Best Book of the Year award. She lives in Park Slope, Brooklyn, with her husband and two sons.