Significance: Many American adolescents do not meet physical activity (PA) guidelines. One way that adolescents can incorporate PA into their daily regimens is by actively transporting themselves to school (ATS). ATS has declined greatly since the 1960's when about one-half of students walked or biked to school. Today it is estimated that only 11% of students use ATS, most of whom are elementary aged. Although it is unlikely that ATS alone will be sufficient for students to meet PA guidelines, it is an opportunity for students to be active. We sought to describe and predict who walks to and from school among high school students. Design: Students completed a 30-item baseline survey as a part of an intervention designed to improve health behaviors. The survey included items that assessed PA, diet, attitudinal and demographic variables. Participants were also asked how they normally get to and from school. Descriptive statistics were calculated and regression was used to predict ATS. Independent variables in the regression model were age, gender, race, school and typical television viewing habits. Results: 2689 students from four high schools in the Inter-Mountain West completed the survey. The mean age of the sample was 15.18 (SD=1.45) years, 50.4% were female and 87.9% described their race as white. Only 4.7 % of students reported walking or biking to school, which is similar to rates that other have found (Braza et al., 2004). Those who walked or biked to school were more apt (X2=3.90; p=.048) to meet guidelines for moderately intense PA (>four times per week) than those who eschewed ATS. ATS adherents were equally apt to meet guidelines for vigorously intense PA as were non-walkers/bikers (X2=.204; p=.660). The sole significant predictor of ATS was gender, as 3.2% of females and 6.3% of males used ATS (OR=.494; C.I.=.336-.726; p<.001). It was disappointing to learn that a very small proportion of students utilize ATS. The failure of a large percentage of students to actively transport themselves to school squanders an important opportunity for PA. Some have hypothesized that barriers to PA are the key reasons that students do not use ATS. The barriers that will likely need to be mitigated to increase ATS are distance and safety. This will likely take the combined efforts of parents, teachers, those in public health, public safety and urban planning to improve ATS rates.Keyword(s): exercise/fitness/physical activity, high school issues