 Lalonde played in the 1962 Quebec International Pee-Wee Hockey Tournament with the LaSalle youth team.His junior career began with the Ontario Hockey Association's Montreal Junior Canadiens, for whom he played from 1968 to 1971, earning 255 points in combined goals and assists.The Junior Canadiens won the Memorial Cup twice during Lalonde's tenure there, once in 1969 and again the following year.