An audit by sportscotland, the national agency for sport, reveals that 61% of available indoor space is being used during term time at secondary schools for activities ranging from football, rugby and badminton to swimming, tennis and yoga.
Across Scotland's 32 local authorities, the school estate includes 3500 hall spaces, 2000 outdoor pitches, 621 multi-use outdoor games areas and a host of fitness suites, dance studios, swimming pools, outdoor running tracks, outdoor basketball and tennis courts.
"It is encouraging to see the extent to which the school estate is open for use by the public and the range of sports which people are participating in," said Stewart Harris, chief executive of sportscotland.
Shona Robison, Minister for Commonwealth Games and Sport, said there was still room for improvement. She added: "There is excellent collaboration on community sport hubs and this will have a positive impact on helping us increase how often local communities are taking part in sport in our schools."