Instead, we saw the PTR extended to October 27 and that, combined with this Facebook post means that we will likely be looking at a whopping 18 week Season 21 and an end date of November 8. I had been comfortable proposing that as the most likely outcome - and therefore proposing an end date for Season 21 of October 25 - but this did not come to pass. With the PTR running until October 15, a length of 16 weeks felt like the best possible outcome early on. Initially, we made a best guess made consulting the length of Seasons since we entered the era of Themed Seasons, assuming that the Season will start on a Friday and end on a Sunday to keep the X weeks, 2 days formula that every Season since Season 13 has had.

Then, the PTR end date got pushed back again. This fit with our more conservative estimate. PTR activity has delayed the end of a Season and extended its life before. This isn’t something wholly unprecedented. However, with the extended two week PTR for Season 22 having started on October 1 and running through October 15, it would be impossible for Season 21 to end that soon. Going back to Season 14, and especially the last few Seasons, I’d made an educated guess that Season 21 was going to end on October 11.

Initially, I sat down with previous Seasons, looked at their start and end dates, and extrapolated an ending date for Season 21 based on that information. Diablo 3 Season 21 began on July 3rd, and it now appears that we’re looking at an end date of November 8 for this notably lengthy Season.

Season 21 end date diablo 3