We release new major versions of GraalVM every 3 months on a predictable schedule, always to the closest Tuesday to the 17th of the month of February, May, August, and November. Major releases become inactive once a new release is published. Only the last major release of the year continues to be updated for the full next year.
Critical Patch Updates (CPU) for GraalVM follow the schedule for all CPU releases of Oracle as described here. The release happens quarterly always on the closest Tuesday to the 17th of the month of January, April, July, and October. All active releases receive patch updates.
Find below a graphical visualizations of the release road map and the dates and version numbers of upcoming releases.