Microsoft .NET 9 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Supported
Microsoft .NET 9 is actively supported. It reaches end of life on 10 Nov 2026.
36 days of security support left
9.0.20 latest release
95% of this branch's supported lifetime has elapsed — 12 Nov 2024 → 10 Nov 2026.
Check your versiondotnet --list-runtimes
Support timeline
Official dates, read directly from github.com and dotnet.microsoft.com.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 12 Nov 2024 | 1y 11mo ago |
| Support Status ends | 10 Nov 2026 | in 1mo |
| Latest release | 9.0.20 · 8 Sept 2026 | current |
How much runway a newer branch buys
Moving to Microsoft .NET 10 extends security support by about 735 days.
| Branch | End of life | Days left | vs 9 |
|---|---|---|---|
| Microsoft .NET 10 | 14 Nov 2028 | 771 | +735 days |
| Microsoft .NET 9 | 10 Nov 2026 | 36 | this branch |
| Microsoft .NET 8 | 10 Nov 2026 | 36 | 0 days |
Frequently asked questions
When does Microsoft .NET 9 reach end of life?
Microsoft .NET 9 reaches end of life on 10 Nov 2026 — 36 days from now. After that date it receives no security fixes.
Is Microsoft .NET 9 still supported?
Yes. Microsoft .NET 9 is currently maintained. Latest release: 9.0.20, published 8 Sept 2026.
What happens when Microsoft .NET 9 reaches end of life?
Security fixes stop. After 10 Nov 2026 this branch receives no further updates under standard support.
How long do I have to upgrade from Microsoft .NET 9?
36 days. Moving to Microsoft .NET 10 instead buys roughly 735 more days of security support.