when was the last nuclear test

Direct answer: The most recent confirmed nuclear test anytime in the world was North Korea’s test on September 3, 2017. Since then, no other country has publicly conducted a verified nuclear explosion as of October 31, 2025, according to widely cited compendia of nuclear testing history. This is the latest widely recognized date, though occasional statements or claims may surface in political discourse, and several countries have conducted non- explosive or non-provoked tests or tests at different yields historically. If you want, I can provide a concise timeline of the major tests by country up to 2017 and summarize post-2017 developments as reported by major monitoring organizations.