When was the 1966 grinch tv special released?

The 1966 television special that introduced Dr. Seuss’s Whoville to a generation of viewers is a 1966 production that aired on television that year, marking the first screen adaptation of the classic book. It was followed by a 2000 live‑action film and a 2018 animated feature, the latter of which was mentioned in the provided evidence as the third adaptation. No further details such as the exact date or network are given in the source, so the answer is limited to the year of release.