When does Diablo 3 Season 37 end and Season 38 start?

Diablo 3 Season 37 kicked off our second return of the Forbidden Archives theme on December 5, 2025, arguably to much delight. Players love the opportunities afforded in Kanai’s Cube-o-Rama — releasing the restrictions of gear type on the three cube slots leads to all sorts of wild combinations, like two additional weapon powers or stacking the Focus/Restraint ring duo with a Ring of Royal Grandeur and a class-specific piece of jewelry. But all good things come to an end, leading us to the inevitable question — when does Season 37 end, and Season 38 start?

We estimate that Diablo 3 Season 37 will end Sunday, March 1, 2026, and Diablo 3 Season 38 will start Friday, March 6, 2026.

How did we get here? As always, it’s a combination of backstory and math. The Diablo 3 team announced the title would enter maintenance mode in Season 30, where it and subsequent seasons would follow a standard quarterly schedule, accompanied by a randomly selected returning theme. And they started out consistently — Seasons 30 and 31 both ran for 12 weeks and 2 days, while Season 32 extended a bit, adding two weeks to the runtime to account for both a PTR period and the launch of Diablo 4’s first expansion, Vessel of Hatred.

However, the 2025 seasonal schedule had some hiccups: first, Season 33 accidentally ended two weeks early. That was resolved (with a few hiccups to the player experience); next Blizzard shifted the original start date of Season 34 back a week, a well-timed shift that was announced just two days before it was scheduled to launch. But then Season 34 ran for four months. Season 35 appears to have put things back on track, running for exactly 13 weeks and 2 days (roughly a quarter of the year). Season 36 continues to trend us closer to a normalized schedule, falling just shy of a quarter at 11 weeks and 2 days.

Season 36 was also the first with a theme hitting its second repeat — the Lords of Hell theme ran in Seasons 25, 30, and 36. The trend continues with Season 37’s Forbidden Archives. Does this mean the pool of repeatable themes only has six options: Lords of Hell (Soul Shard gems), Forbidden Archives (Kanai’s Cube-o-Rama), Ethereal Memory (Ethereal weapons), Shades of the Nephalem (shadow clones/fourth cube slot), Light’s Calling (Angelic Crucibles), and the Eternal Conflict (Pandemonium buffs)? That’s relatively small for a recurring cycle and results in a continually shrinking (but easy to guess) pool.

Now, we’ve noted before that a fair number of themes are integrated into the base game: Season 23’s Follower system revamp, Season 26’s Echoing Nightmares, Season 28’s Altar of Rites, and Season 29’s Visions of Enmity. But where are Season 21’s Trial of the Tempests, 18’s Season of the Triune, 17’s Season of Nightmares, 16’s Season of Grandeur, 15’s Boon of the Horadrim, or 14’s Season of Greed? They may not be “strong” themes as far as encouraging player engagement, but Blizzard has shown in the past that they can combine these — for example, activating extra goblins or double Horadric caches during other seasons. I’d love to see a larger option pool for a beloved title.

Regardless, you can continue to enjoy Diablo 3 Season 37’s Kanai’s Cube-o-Rama for at least another month. We estimate Season 37 will end on March 1, and Season 38 will start on March 6. See you in Sanctuary!