"Windows 12 release date" and "beta release date" are often conflated — these are two distinct milestones, typically separated by 6-9 months.
The Evidence Timeline
ARL and Vanguard build string references appeared in Canary builds in Q1 2025. Historically, this internal-flag-to-public-beta gap runs 9-12 months, pointing to Q4 2025–Q1 2026 for a broader beta.
However, OEM certification activity was already underway by Q1 2025, suggesting a possibly compressed schedule.
Our Beta Window Estimate
Dev Channel: Q3 2025. Broader Beta Channel: Q4 2025, roughly coinciding with General Availability.
Why the Beta Might Be Short
If GA targets October-November 2025, the beta period could be unusually compressed versus Windows 11's year-long beta — less time for public bug discovery before launch.
What This Means for You
Enrolling in the Insider Program now (see our beta program guide) positions you for access as early as mid-to-late 2025.