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Kevin OcieKevin Ocie 

Dates for winter 21 for both sandbox and production

Dates for winter 21 for both sandbox and production
Best Answer chosen by Kevin Ocie
AbhishekAbhishek (Salesforce Developers) 
For the Winter '21 Release, we will upgrade the preview instances to Winter '21 on September 11 and September 12, 2020, and non-preview instances to Winter '21 on October 16 and October 17, 2020. Between now and September 11, 2020, we'll route all sandbox requests to preview instances.

For further reference you can check this too,

https://www.salesforce.com/blog/winter-21-sandbox-preview/#:~:text=For%20the%20Winter%20'21%20Release,16%20and%20October%2017%2C%202020.&text=Between%20now%20and%20September%2011,sandbox%20requests%20to%20preview%20instances.


Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks.