More than a decade ago, the K-12 Framework for Education and the Next Generation Science Standards (NGSS) shifted states' notions of what constitutes the core of science skills and knowledge that students need to thrive in school and beyond. The majority of states adopted standards based on the framework as well as the NGSS. Yet because of the standards' complexity and an overall lack of emphasis on science instruction, districts have few quality curricula and materials to choose from. There is no single policy or set of policies that will address all the challenges teachers and students face in accessing and using high-quality science instructional materials. Even as teachers wait for the market to catch up to their demands for quality materials, state leaders can take several steps that will make a real difference in science classrooms: (1) maintain rigorous science standards and demand high-quality curriculum options; (2) assess the state's instructional materials landscape; (3) help districts identify and select quality materials; and (4) invest in professional learning tied to standards and quality curriculum.