Numerous institutions are developing cybersecurity education and training programs to supply the considerable global demand for cybersecurity professionals. However, these institutions face a barrier in building realistic laboratory environments, commonly referred to as {em cyber ranges}, needed for hands-on skills development. Cybersecurity labs differ from traditional computing labs in both size and complexity, often requiring distinct components to represent network configurations, adversarial computing, and defense mechanisms. We present an open-source cloud-based cybersecurity lab solution, enabling broader access to cybersecurity education by reducing cost and complexity barriers. The solution already serves over a thousand students each year on the Google Cloud Platform in a variety of learning environments. In this paper, we describe the solution’s architecture and deployment characteristics. Additionally, we present challenges educational institutions have when using cloud infrastructure and our approaches to addressing these challenges.