For Jain Chaturmas 2026, the commonly observed season starts on 28 July 2026 in the Jain calendar. ( atmadharma.com)

The usual ending point is Kartik Shukla Ekadashi / Prabodhini Ekadashi, which falls on 21 November 2026 in the 2026 calendar. Some Jain communities also treat Kartik Purnima as the completion day, which is 24 November 2026. ( baps.org)

So, in short: Chaturmas 2026 ends around 21 November 2026; in some traditions, the completion is observed on 24 November 2026. ( baps.org)