The college was established as a junior college by St Thomas Valiyapally Ranni, a pioneer parish of the Syrian Knanaya Arch Diocese of Malankara, with the whole hearted support of the then Bishop late lamented His Grace Abraham Mor Clemis to meet the educational needs of the youth of the local community

Inception of the college with Pre Degree Group I, II, III and IV

Establishment of Department of English, Commerce, Mathematics, History, Zoology, Botany, Physics

Establishment of Department of Physical Education

The college was upgraded as a first grade college in 1968 and is the only institution of higher education in this part of the country.

Establishment of Department of Economics and started B. Sc Botany, B. Sc Chemistry, B.A Economics, B. Sc Zoology.

Started B. Com

Started BTS.

Started M.Sc Physics

Started M.Sc Chemistry (Pure)

Started M.T.A (Master of Tourism Administration)

First NAAC Visit. College accredited with B+

Started BA English and The English Lab inaugurated

As the Golden Jubilee project St. Thomas College of Advanced Studies, Edamury, Ranni, a Self Financing College affiliated to M.G. University, Kottayam was established in June 2014.

In March 2016, the College was assessed and re-accredited in the second cycle by the National Assessment and Accreditation Council (NAAC) of UGC and graded at B level.