Guelph

The franchise started as the Toronto Marlboros, who moved to Hamilton to become the Dukes of Hamilton in 1989. Following the 1990–91 season, the franchise was relocated to Guelph and a contest was held to name the team. Tom Douglas submitted the winning entry "Storm" and the team was renamed the Guelph Storm.

The first year in Guelph was dismal, but the building process for Guelph was soon successful. The Storm finished first place in the 1994–95 season. General Manager Mike Kelly was voted the OHL Executive of the Year and Craig Hartsburg voted the Coach of the Year for the Canadian Hockey League and the Ontario Hockey League. Draft picks from the early years in Guelph include Jeff O'Neill and Todd Bertuzzi.

Guelph reached the OHL finals in 1995 and 1996. The team qualified for the 1996 Memorial Cup by playing against the Memorial Cup host Peterborough Petes in the OHL final.

The Storm won their first J. Ross Robertson Cup in 1998. This success continued into the Memorial Cup Tournament as the Storm rallied to the Championship Game where they lost to the Portland Winter Hawks in overtime in the final game.

In the year 2000, the team moved from the historic but aging Guelph Memorial Gardens into the Guelph Sports and Entertainment Centre (since renamed the Sleeman Centre). The Storm were selected to host the 2002 Memorial Cup tournament. It marked the team's third appearance in the national junior championship, their first as host team.

Two years later, the Storm won their second OHL Championship, and returned to the 2004 Memorial Cup hosted in Kelowna, British Columbia.

In the 2008 NHL Entry Draft, defenceman Drew Doughty was selected 2nd overall by the Los Angeles Kings, the highest ever selection of a Guelph Storm player.

In 2014, the Storm captured their third OHL Championship, and subsequently advanced to the 2014 Memorial Cup final, hosted in London, Ontario. The Edmonton Oil Kings won Cup championship on 25 May 2014 with a 6-3 win over the Storm.

In late April 2019, the team captured the Wayne Gretzky Trophy as 2019 OHL Western Conference Champions again winning the J. Ross Robertson Cup. On 12 May 2019, in the sixth game of the finals, the Storm defeated the Ottawa 67's to win the OHL championship and were again headed to the Memorial Cup, their sixth appearance, to start on 17 May in Halifax. Nick Suzuki (a Montreal Canadiens prospect) earned the Wayne Gretzky 99 Award as OHL Playoff MVP. He was the third Storm player in the team's history to win this award.

In 2021,the team agreed to stop using the song Cotton Eye Joe by the group Rednex during games after consultation with local groups alleging the song has racist origins.