Rachael Treasure graduated from Orange Agricultural College and Charles Sturt University. In the early 1990s, she was employed by the ABC in their rural Sale office. After meeting her then-husband, John Treasure, whose family had been droving cattle in the Dargo High Plains area since the 1870s, she began working with the Treasure family's weekend tourist droving business and, around the same time, in training working dogs.
A period working on a cattle station in Queensland led to her first novel, Jillaroo. She subsequently published further rural romances, from The Rouseabout to Cleanskin Cowgirls. She also returned to her family property in Fingal Valley, Tasmania.
In 2016, Treasure published the autobiography Down the Dirt Roads, exploring the breakdown of her marriage, the loss of the family farm, and her resulting burgeoning interest in regenerative agriculture.