Google Container-Optimized OS (COS) cos-129 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Google Container-Optimized OS (COS) cos-129 is actively supported. It reaches end of life on 1 Mar 2028.
Support timeline
Official dates from the Google Container-Optimized OS (COS) release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 21 May 2026 | — |
| End of life (scheduled) | 1 Mar 2028 | in 570 days |
| Latest release | cos-129-19506-299-82 · 4 Aug 2026 | current |
How much runway a newer branch buys
Google Container-Optimized OS (COS) cos-129 is the newest branch — this is the longest runway currently available.
| Branch | End of life | Days left | vs cos-129 |
|---|---|---|---|
| Google Container-Optimized OS (COS) cos-129 | 1 Mar 2028 | 570 | this branch |
| Google Container-Optimized OS (COS) cos-125 | 1 Sept 2027 | 388 | -182 days |
| Google Container-Optimized OS (COS) cos-121 | 1 Mar 2027 | 204 | -366 days |
| Google Container-Optimized OS (COS) cos-117 | 1 Sept 2026 | 23 | -547 days |
Frequently asked questions
When does Google Container-Optimized OS (COS) cos-129 reach end of life?
Google Container-Optimized OS (COS) cos-129 reaches end of life on 1 Mar 2028 — 570 days from now. After that date it receives no security fixes.
Is Google Container-Optimized OS (COS) cos-129 still supported?
Yes. Google Container-Optimized OS (COS) cos-129 is currently maintained. Latest release: cos-129-19506-299-82, published 4 Aug 2026.
What happens when Google Container-Optimized OS (COS) cos-129 reaches end of life?
Security fixes stop. After 1 Mar 2028 this branch receives no further updates under standard support.
How long do I have to upgrade from Google Container-Optimized OS (COS) cos-129?
570 days. This is already the newest branch, so this is the longest runway currently available.