Elementary school teachers' perceptions of school resources (i.e., material, human, and social) for teaching science to diverse student groups were examined across three school districts from one state. As part of a 3-year curricular and professional development intervention, we examined the effect on teachers' perceptions after their first year of participation. The study involved 103 fifth-grade teachers from 33 schools participating in the intervention and 116 teachers from 33 control schools. The teachers completed a survey at the beginning and end of the school year. As a result of the intervention, teachers in the treatment group reported more positive perceptions of school resources than teachers in the control group.