No, the Milan Metro (ATM) is not a 24-hour service in 2026, but it offers extended hours during major events. On a standard day, the Metro runs from approximately 05:30 AM to 12:30 AM. However, in preparation for the Milan-Cortina 2026 Winter Olympics (February 2026), the city has implemented an "Olympic Mobility Plan" that extends Metro service until 02:00 AM on the M1 and M2 lines to accommodate the massive influx of visitors. For late-night travel during regular periods, Milan operates a reliable Night Bus (Rete Notturna) network, with lines that follow the Metro routes (NM1, NM2, NM3, and NM4) and run every 30 minutes throughout the night. This ensures that while the underground "locks up" for maintenance, travelers can still navigate the city safely. In 2026, using the ATM Milano app is the best way to see real-time updates on these "Olympic extensions" and late-night bus arrivals.