The Kedarnath Temple opening date in the year 2020 was April 29 at 6:10 AM. The temple closed on November 16, 2020, due to the winter season and other considerations.

For additional context, the opening and closing of the Kedarnath Temple are governed by Hindu rituals and the traditional Hindu calendar (Panchang), with opening generally happening around Akshay Tritiya in spring and closing around Bhai Dooj/Diwali in autumn. If the question about "open in 20" refers to the year 2025, the temple opened on May 2, 2025, at 7:00 AM, and it is expected to close around October 23, 2025.

Please clarify if the query was for a different year or specific detail about the temple opening.