Change in high school student information literacy (IL) knowledge and skills, from freshman year to senior year in high school was the focus of this quasi-experimental research project. Researchers used a free information literacy skills assessment tool entitled TRAILS (Tool for Real-time Assessment of Information Literacy Skills) to measure student IL skills. A total of 201 high school students participated in the study. Paired samples t-test results were mixed for specific TRAILS sub-categories, however, the senior mean for the total TRAILS assessment was significantly higher than the mean the participants earned on the total TRAILS assessment when they were freshman. Cohen's d effect size was 0.61. The significance of the information literacy curriculum is discussed in light of these findings.