IntroductionChiang Rai Province faces increasing road traffic fatalities, especially among young adults and adolescents, largely due to failure to wear motorcycle helmets.ObjectiveTo determine the prevalence and factors influencing helmet-wearing behavior among high school students in Chiang Rai Province.MethodsA cross-sectional online survey was conducted among grades 7–12 students across 18 district schools from July 8 to August 8, 2024.ResultsAmong 1,706 participants, only 23.5% reported wearing a helmet every time. Logistic regression revealed that male gender, having a driving license, owning a helmet, having peers/parents who wear helmets, and receiving parental reminders were significantly associated with helmet use (p < 0.05).ConclusionHelmet use among these students remains low, influenced significantly by personal, social, and family-related factors.