Spearfish, South Dakota (United States of America) - "Annual Spearfish Canyon Half Marathon / 5K". Northern Hills Area CASA is proud to host the 40th annual Spearfish Canyon Half Marathon/5K on Saturday, July 11, 2026. Please join us and enjoy the beauty of the Black Hills, while supporting our mission of serving victims of child maltreatment in 8 counties of western South Dakota. www.nhcasa.com/event/spearfish-canyon-half-marathon-5k-race