This publication covers the planning and design of school grounds for outdoor learning in new and existing K-12 facilities. Curriculum development as well as athletic field planning and maintenance are not covered although some references on these topics are provided. It discusses the different types of outdoor learning environments that can be considered, the value of flexible spaces for outdoor learning, and resources for those interested in outdoor learning environments. Also explored are environmental education's physical impact on school grounds, considerations during school site development when outdoor education is to be included, and existing school site redesign for outdoor education. [This is an updated version of ED442266 (published in 2000).]