The Wolfs were both raised Jehovah's Witnesses in British Columbia, Jayli from Creston and Hayden from Vernon, and met online through mutual friends.
[4] Their first professional EP Thousand Lives, released in 2015 under Toronto-based Foreseen Entertainment, followed the single "Howling", inspired by their childhood religion.
For the single "Breakdown", which Hayden based on his own mental health crisis and dedicated to his late brother who took his own life earlier that year, Once A Tree partnered with Kelowna General Hospital for their Not Alone Campaign.
[13] Fool's Paradise was described as more lighthearted than their previous work, which Hayden attributed to coming "to a much happier place in life".
[15] Jayli also acts and releases solo music, such as "Child of the Government" about her First Nations father being taken in the Sixties Scoop; Hayden is a visual artist and photographer.