Skiing and snowboarding are among the most popular winter activities in Canada. Unfortunately, many injuries occur in these activities, including severe injuries often involving the head, which can result in death. These injuries, particularly severe head or brain injuries, are an important burden on the health care system, and may be prevented by encouraging helmet use. Helmet effectiveness is well established, but there are little recent data on ski and snowboard helmet prevalence at ski areas in southern Alberta, with no published reports on correct helmet fit. This study determined the prevalence of helmet use and correct helmet use at a single ski area in Southern Alberta and examined the factors associated with helmet use and correct fit. Information on helmet use and correct use, as well as environmental and behavioural characteristics was collected at the base of the ski hill by both interviewing and observing participants. Age (<18 years old), skiing/snowboarding with companions, and skiing/snowboarding with companions also wearing helmets increased the likelihood of each wearing a helmet and wearing a helmet correctly. The protective effect of helmets in skiers and snowboarders has been demonstrated convincingly. The education and promotion of helmet use and correct helmet use is paramount in reducing the risk of head injuries among skiers and snowboarders. Our findings will inform participants, parents, members of the ski-snowboard industry, and the stakeholders that seek to influence them to improve the safety of skiers and snowboarders of all ages. I would like to thank my supervisor; Dr. Brent Hagel for his unwavering support and encouragement, his expertise and guidance through this process was instrumental. Dr. Hagel continued to inspire me and encourage me to continue with my graduate studies, despite seeing me at my worst. I will forever be grateful for his kind words, compassion, and the opportunity he has provided me to complete my degree. I would also like to recognize the contributions of my committee members, Dr. Carolyn Emery, Dr. Alberto Nettel-Aguirre, and Dr. Willem Meeuwisse. It was a pleasure to work with all of them. I am forever grateful for the time, wisdom and continued support they have provided over the years. Next, I would like to thank the research assistants for helping me with my project. They braved the harsh winter weather to help me collect data and I could not have done it without them. A special appreciation is directed to Nicole Romanow for her help and friendship.