How often does Google change their algorithm?

Each year, Google changes its search algorithm around 500–600 times.

Small to large changes are made by Google each day of the year but some of the algorithm changes are officially released by Google for the search results optimization & we know them by major Google algorithm changes.

Quote from: 12Three on March 22, 2019, 02:29:16 AM
How often does Google change their algorithm?

Very Frequently.
But all algorithms do not affect on your website's rank, like humming bird.
When major update comes like Google Panda, it will affect on website's rank.

each year google nearly 500-600 changes in the algorithm but most of them are minor

every year google changes neary 600 times but most of the are minor. They will post in twitter if there is any big update