In Jainism, Solah Karan Upvaas refers to a special series of 16 fasts (upvaas) observed on specific auspicious days, as per the Jain calendar. The dates for Solah Karan Upvaas are determined according to the Jain lunar calendar (Vikram Samvat or Jain Panchang), and they change every year.

For 2025, the exact dates for Solah Karan Upvaas will depend on the sect (Shwetambar or Digambar) and the regional Jain calendar in use. Generally, these fasts begin after Chaitra month and are observed on select days (often during the Chaturmas period or on certain tithis).

To get the precise dates for Solah Karan Upvaas in 2025:

• Please consult a Jain Panchang (calendar) for 2025, or
• Contact your local Jain temple or Sangh, as they often publish annual Jain fasting and festival calendars.

If you share your Jain sect and region, I may be able to guide you further on how to find the specific dates.