The study reported here measured the impact of natural schoolyards, within the science curriculum, on middle school students' environmental attitudes. It was expected that students engaged in such a curriculum would show increased pro-environmental attitudes and behaviors. Participants were 7th-grade students in Madison, WI. A modified form of the validated short-form Measurement of Ecological Attitudes survey (Maloney & Ward, 1975) was used in a pre-test/post-test format to measure changes in students' environmental attitudes. No gains were found between pre- and post-test scores. Implications for natural schoolyard curriculum design and research, and possible outdoor Environmental Education (EE) partnership with Extension are discussed.