This article seeks to contribute to the analysis of the prosodic system of Québec French in a variationist framework. However, major problems have to be resolved before one can give a comprehensive view of this system, one of these concerning stress assignment. In order to examine the validity of the traditional view claimed for French by most linguists, which states that stress is always superposed on the final syllable of lexical words, different perceptual tests were devised and carried out with two groups of students. The results of these tests show the effect of structural factors on the perception of stressed syllables in Québec French and demonstrate that this canonic rule does not always hold for varieties of Québec French. On the basis of these results, a subset of stress rules is then proposed and illustrated with examples of words tested in the perceptual tests. Counterexamples to these rules are thereafter discussed, and a reconsideration of the principles of syllabification that are usually taken for granted for French is proposed in light of variable rules.