A high school diploma is no longer enough to get by in the current job market, and high-level knowledge, skills, and abilities are crucial to success especially in the fields of and science, technology, engineering, and mathematics (STEM). Afterschool programs are a critical component and lever to better prepare our youth for college and careers, providing opportunities to not only build academic and employer-desired skills, but also to expose youth to different opportunities and allow them to foster their own identities. Given racial and gender disparities in STEM fields of study and careers, afterschool programs are also crucial to ensuring equity for underrepresented and traditionally underserved youth populations. This article highlights the important role afterschool plays in preparing youth for college and careers in STEM fields, featuring the work of three high-quality STEM afterschool programs from across the country--Project Exploration, SHINE, and EVOLUTIONS. The article concludes with recommendations for programs leaders to promote more STEM learning. [This document is excerpted from the resource, "STEM Ready America: Inspiring and Preparing Students for Success with Afterschool and Summer Learning" edited by Ronald Ottinger and developed by STEM Next with support from the Charles Stewart Mott Foundation.]