In 2026, Jain Chaumasa (Chaturmas) will begin on:

• Saturday, 25 July 2026 – Āshādh Shukla Ekādashi (Devshayani Ekadashi)

Traditionally, Chaturmas starts from this Ekadashi.

In many Jain sanghs, the formal stay of sādhus/sādhvīs and local announcements of “Chaturmas prārambh” are done on:

• Tuesday, 28 July 2026 – Āshādh Sud Chaudash (Chaumasi Chaudas)

So, spiritually Chaumasa starts from 25 July 2026, and practically in many communities activity and fixed-stay arrangements begin by 28 July 2026.