Ammodramus savannarum (Grasshopper Sparrow) is a grassland passerine considered at risk in several regions of eastern USA and Canada. Detailed information is lacking on structure and breeding-habitat components for Grasshopper Sparrows in eastern Canada. We surveyed Grasshopper Sparrows in suitable habitats in southwestern Québec and described habitat characteristics to increase our knowledge of the species' breeding-habitat associations in eastern Canada. Grass-hopper Sparrows were detected in grass-dominated abandoned fields, pastureland, and hayfields generally located on poor sandy soil supporting low and sparse vegetation. Suitable sites with or without Grasshopper Sparrows did not differ in their structural components nor in their plant composition. Sites used by Grasshopper Sparrows were embedded within a perennial crop-dominated matrix where forest cover was reduced, and were larger than sites where they were absent. Conservation and stewardship activities should aim to secure large tracts of grasslands in southwestern Québec.