No official date yet. One creator, RageGamingVideos, says Season 1 lasts one month from 10 September, which would end it on 10 October 2026. No official post gives an end date.
Treat 10 October as a working assumption, not something to plan around. BULKHEAD says the reset date will be announced ahead of time, so watch Steam News.
Backed byWhat wipes and what you keep