Zephyr LTS mapping to NCS versions

[olofjohnsson]

Hello!

Can you map the zephyr versions to the LTS versions if possible?

We are using NCS 3.02 with the zephyr version 4.0.99. How does this relate to any of the LTS versions?

We will be using the NCS 3.1.0 with the zephyr version 4.1.99. How does this relate to any of the LTS versions?

LTS versions referred to:

Release	Release date	EOL
Zephyr 4.2.0	2025-07-18	2026-03-20
Zephyr 4.1.0	2025-03-07	2025-11-14
Zephyr 3.7.0 (LTS3)	2024-07-26	2029-07-27

If not possible to map, how can we choose a NCS version that use the official LTS versions in the list above?

[Benjamin]

Hi Olof,

Unfortunately there is no direct mapping because the nRF Connect SDK doesn’t align with Zephyr releases. It sits somewhere in between them. The release notes specify which Zephyr commit was used, but that commit doesn’t correspond to any particular version.

Example:
In the NCS 3.1.0 release notes you can see that the Zephyr for contains all commits from the upstream Zephyr repository up to and including 0fe59bf1e4b96122c3467295b09a034e399c5ee6.

Best regards,
Benjamin

[olofjohnsson]

Thanks! We we can close this ticket