 | November 1959 | The Chinmaya Mission, Tattamangalam was established by a handful of committed devotees of Swami Chinmayanandaji. |
| In 1960's | Swami Chinmayanandji sent few sewing machines sponsored by a devotee in Mumbai. These sewing classes that were organised spurred the Mission to think on lines of opening a school. Thus Chinmaya Vidyalaya Tattamangalam was conceived |
| June 12th 1977 | The Vidyalaya was formally established in a rented building at Western Village, Tattamangalam . |
| June 1979 | The Vidyalaya was shifted into its own building which currently houses the Kindergarten Block and Play School . |
| In 1980 s | Visit of H.H.Swami Chinmayanadaji to the Vidyalaya and in his address to the public that the school will grow into a Senior Secondary School inspired the mission to affiliate the Vidyalaya to the CBSE . |
| In 1994: | The Vidyalaya was granted affiliation and became a Secondary School and presented its first batch of class 10th for public examination. |
| June 7-1996 | The main Vidyalaya moved into the 5.2 acre plot which now houses the present Vidyalaya and has upgraded to a Senior Secondary School and had presented the first batch of class 12th students for the Examination in 2012. |
| 5th June 2000 | Second phase of Chinmaya Vidyalaya Tattamangalam was consecrated by H H VIVIKTANANDAJI- Regional Co ordinator, Chinmaya Mission , Kerala Region |
| 22nd January -2003 | Chinmaya Vidyalaya Tattamangalam. Aunit of CMECT Palakkad, SILVER JUBILEE HALL was consecrated by HH SWAMI THEJOMAYANANDAJI |
| 2010 | The H.S.S building started functioning in the year 2010. It consist of various laboratories such as Physics, Chemistry, Biology and Computer. Yoga hall , 4 class rooms and Lavatories are also added in this block. |