Los Angeles' second round draft pick in 2010, Toffoli broke out with a 107-point campaign as an 18-year old with the Ottawa 67's in 2010-11, tying for the Ontario Hockey League scoring lead while leading the league in goals scored with 57. He followed that up with a 100-point season (52-48=100) in 2011-12, leading the league in goals for the second straight year with 52.