Posh Dashmi (Poṣa‑daśamī) is decided only by the lunar tithi, so the exact Gregorian date for 2026 depends on your local Jain panchang and region (North‑Indian vs Gujarati calendar, Digambar vs Śvetāmbara, etc.).

For recent years, Poṣa‑daśamī has been falling in late December / early January, but:

• There is not one fixed national date for 2026.
• Different Jain calendars can show it one day earlier or later.
• Temples usually publish their own annual Jain calendar with the final date.

Because of this variation, I should not guess a specific 2026 date. To know the correct Posh Dashmi 2026 date(s) for you, please:

1. Check your local Jain temple / sangh calendar, or
2. Look in a regional Jain panchang (for your city/country) under:

- Poṣh/Posh or Māgsar/Margashirsha vad Dashami (9–11 vad are often observed).

For background on what Posh Dashmi is and how it is celebrated, you can read more here