Abstract
Bicycle helmet use from elementary school to high school was examined using retrospective reports collected from 166 students at a university in northern Colorado. Bicycle helmet use in elementary school was a common practice, especially among students born after 1980. However, a rapid decline in bicycle helmet use in junior high school and high school was reported. Students with higher perceived norm of family bicycle helmet use wore helmets more often in junior high school and high school than students with a low family norm. Growing up in the bicycle-friendly community was positively associated with consistent bicycle helmet use.