Fedora 31 will be released on 2019-10-29.

• https://lists.fedoraproject.org/archives/list/logistics@lists.fedoraproject.org/thread/N44O3QSRZJTWWXLXOP3JX2U2BTWHM3TE/

We say maintained for approximately 13 months because the supported period for releases is dependent on the date the release under development goes final. As a result, Release X is supported until one month after the release of Release X+2.

This translates into:

• Fedora 29 will be maintained until 1 month after the release of Fedora 31.
• Fedora 30 will be maintained until 1 month after the release of Fedora 32.

https://fedoraproject.org/wiki/Fedora_Release_Life_Cycle

And so Fedora 29 will be maintained until 1 month after the release of Fedora 31, around 2019-11-29.

See also:

• Remove soon-EOL Fedora 29 docker-images#70