[1] In 1960, the tournament expanded to four teams, with the winner from Eastern Ontario added to the event, and was reduced to a single round robin.

The winner represented Ontario at the Eastern Canadian Championship that year.

Until 1991, the team with the best round robin record won the provincial championship.

In 1991, a three-team playoff was introduced, with the top team earning a bye to the final.

The event was re-named the Ontario Scotties Tournament of Hearts in 2007 when Scott Paper was sold to Kruger Inc.

In 2018, the event adopted a 12 team triple knockout format for the first time, followed by a page playoff.

A last minute decision by CurlON added a ninth team for the 2020 event.

The 2022 event was suspended due to the new provincial regulations caused by the Omicron variant of COVID-19, and CurlON appointed a team again for the second straight year.