Born in Jackson, Wyoming, Johnson grew up in nearby Victor, Idaho, and made her World Cup debut in December 2015. In her first World Cup season in 2017, she finished eighteenth in the downhill standings. At the World Cup finals in March at Aspen, Johnson crashed in the downhill and suffered a tibial plateau fracture to her left leg. Johnson quickly recovered from this injury and in the 2018 season she finished eleventh in the downhill standings and competed in the Winter Olympics, finishing seventh in the downhill and fourteenth in the super-G.