Luke Burghardt scored the opening goal of the game in the second period to give the Storm a 1-0 lead.
But the the Frontenacs reeled off four unanswered goals to roar past Guelph 4-1 in Kingston.
The Storm were coming off a win Saturday over Ottawa.
Guelph now has a 7-8-2-1 record and sit ninth in the Western Conference.
Next up for the Storm, a Friday night date with the Ottawa 67’s at the Sleeman Centre.
And, on the Junior B hockey circuit, the Dutchmen edged the Guelph Hurricanes 2-1 in Kitchener. Alex Ritchie with the lone goal for the ‘Canes in the loss.