Anna Heather Frost (born 1 November 1981)[1] is a New Zealand trail and ultra runner.

[2] In 2012, she won the Transvulcania ultramarathon in the Canary Islands in a record time of 8:11:31,[3][4] but did not return to defend her title the next year.

[5] She finished first at the Speedgoat 50K in Utah in 2012,[6] second at the Ultra Cavalls del Vent in the Pyrenees mountains of Spain,[7] and first at the Maxi-Race in Annecy, France.

[11][12] In 2015, the SisuGirls project began releasing a series of middle-grade books covering true stories of women in action and adventure sports.

The first book in the series, Fearless Frosty, was written by Chloe Chick and focuses on Anna Frost.