This study investigated message effectiveness on behavioral intentions of Pacific Crest Trail hikers to follow two Leave No Trace practices: dispose of waste properly and travel and camp on durable surfaces. This study tested the effect of three message frames--humor, moral, or threatening appeals--to determine which message influenced the viewer's intent to follow an LNT principle. This study also tested which message sender--ranger or volunteer--influenced the viewer's intent to hike on durable surfaces. The data shows a relationship between gender and survey participants' reported intentions to perform LNT behaviors. The study also found that participants with more self-reported prior knowledge of LNT principles were more likely to perform the recommended behaviors. These findings indicate that LNT education is an effective tool for limiting the environmental impact of hikers on the PCT, and they highlight a need for further research in LNT communication, gender, and outdoor recreation.