Vulpia myuros, a widespread grass, exhibits a cosmopolitan distribution, naturally occurring in a variety of regions chiefly within Europe, parts of Asia, and North Africa. Its reach extends to other continents where it has been introduced, including large swaths of the Americas, several areas in East Asia, and pockets in Sub-Saharan Africa. In certain regions of South America and Pacific islands, rat's-tail fescue is sometimes thought to be an unwelcome guest, potentially having an impact on local ecosystems. The plant's ability to adapt across diverse climates testifies to its ecological versatility.