First held in 1963, and annually since 1971,[1] it has a certified running distance of 26.219 mi (42.195 km).
In 2014, a record 15,000 participants came out to celebrate Canada's longest running marathon turning 50, including 500 participants who competed in the first-ever 50KM Ultra.
In 2022, Calgary Marathon welcomed Servus Credit Union as the title sponsor.
In 2024, Calgary Marathon celebrated its 60th "Diamond" Anniversary with a one-time-only 60 km Ultra road race and finisher medals that featured two "diamonds".
In 2024 the marathon handed out non-alcoholic beer at aid stations becoming the first North American marathon to do so at an official aid station.