Coss was born and raised in Seattle. She started playing piano at the age of five, and learned the basics of music theory, composition, and ear via the Robert Pace method. She picked up the saxophone at age nine, fell in love with jazz at 11, and played in her middle school jazz band. During her time in high school, she toured and performed internationally with the world-renowned GHS Jazz Ensemble led by Clarence Acox. Coss attended William Paterson University on a full scholarship and graduated Magna Cum Laude in 2008 with a Bachelor of Music in Jazz Studies/Performance. She privately released her 2010 self-titled debut album to local acclaim.
After moving to New York in 2011, Coss was selected to participate in Betty Carter's Jazz Ahead Residency Workshop at Kennedy Center, and at Ravinia's Steans Jazz Institute, where she worked with Rufus Reid, Curtis Fuller, Nathan Davis, George Cables, and David Baker. Coss continued her saxophone, flute, and clarinet studies with instructors/players including Gary Smulyan, Donny McCaslin and Mark Taylor, composition with Rich DeRosa, and flute and composition with Anne Drummond, as well as improvisation with Harold Mabern. She is a highly regarded educator who serves on the Board of Directors for the Jazz Education Network (JEN) and is a jazz faculty member at the Juilliard School, the New School, and the Borough of Manhattan Community College (CUNY).
Coss joined Pelt's studio and touring group for 2013’s Water and Earth and 2014's Face Forward, Jeremy before signing with Origin for 2016's Restless Idealism, her second leader date featuring Pelt as a guest. It was well-received by jazz critics and resulted in her first of four annual selections as a "Rising Star" in the Downbeat Critic's Poll. Coss signed to Posi-Tone for 2017's Chasing the Unicorn. She and her quintet delivered sometimes startling originals and savvy interpretations of demanding tunes by Joe Henderson ("A Shade of Jade"), Wayne Shorter (Virgo"), and Lionel Loueke ("Benny's Tune"), in addition to pop standards by Willie Nelson and the Beatles. A year later, Coss delivered the strident, passionate, and sophisticated The Future Is Female, a program of ten originals and the first to feature Yamanaka on piano and keyboards. The set was universally acclaimed for its imaginative, swinging hard bop tunes and fleet, blues-infused soloing. While the titles of her compositions reflect active struggle, her music offers the positive side of that outlook. She was recognized as a Rising Star by Downbeat for the fifth year in a row and listed by Jazziz as an artist to watch in 2019. In May of that year she released her fifth album, Quintet, for Outside in Music. The well-regarded set offered re-recordings of eight of her previously recorded compositions in a live setting. ~ Thom Jurek, Rovi