The psychometric properties of the Ages & Stages Questionnaires (ASQ) (Bricker & Squires, 1999) used in a French-Canadian preschool population were compared with psychometric data derived from U.S. normative studies. The ASQ was translated into French (Bonin, Robaey, Vandaele, Bastin, & Lacroix, 2000) and used in four early childhood day care centers, with children ages 4-60 months. The psychometric properties of the French version are presented at the 42-, 48-, 54-, and 60-month ASQ intervals. Internal consistency varied across domains, from alpha of 0.24 for personal social domain at 60 months to 0.81 for communication at 48 months. Generally, the internal consistency properties, means, and standard deviations of the ASQ were similar in the French translation, but variations across US and French-Canadian populations were observed. The results are supportive of further development of the French version of the ASQ. (Contains 4 tables.)