The ambitious project was announced at a 1965 me
The ambitious project was announced at a 1965 meeting of the Philological Society by its originator, Michael Samuels. Work on the HTE started in the same year.
In 2017, the University of Glasgow was awarded the Queen's Anniversary Prize for Higher Education for the HTE.[Queen's Anniversary Prize for Higher Education for the HTE.
A second edition of the online HTE is currently in progress and is expected to be launched in late 2020. Work is released on the freely-available HTE website when available. 
On 22 October 2009, after 44 years of work, version 1.0 of the HTE was published by Oxford University Press in a two-volume slipcased set as the Historical Thesaurus of the Oxford English Dictionary (HTOED). The two hardcover volumes together total nearly 4,500 pages.