| 1911 | Connecticut College founded to provide higher educational opportunities for women | |||
| Connecticut College Arboretum established | 1931 | |||
| 1952 | Bolleswood Natural Area designated for long-term ecological studies | |||
| Human Ecology (now Environmental Studies) major first offered | 1969 | 1969 | Environmental Model Committee Established | |
| Campus wide recycling program begun (one of the first in the nation) | 1970 | |||
| 1973 | Unity House founded to support multicultural students | |||
| Goodwin-Niering Center for the Environment established | 1993 | |||
| Earth House formed | 1994 | 1994 | First Environmental Coordinator hired | |
| 1996 | Holleran Center for Community Action and Public Policy established | |||
| College signs carbon offset agreement with Reforest the Tropics | 1999 | |||
| 2001 | Renewable Energy Fund (now Sustainable Projects Fund) begun | |||
| Sustainability Fellows Program initiated | 2012 | 2012 | New London Hall reopens after a green renovation and receives LEED Gold | |
| 2013 | Office of Sustainability established | |||
| Suzi Oppenheimer '56 Faculty Director of Sustainability appointed | 2014 | |||
| 2016 | First Dean of Institutional Equity and Inclusion hired | |||
| Campus Sustainability Task Force convened | 2017 | |||
| 2018 | Connecticut College awarded Silver ranking from the Association for the Advancement of Sustainability in Higher Education | |||
| Connecticut College achieves Gold rating from the Association for the Advancement of Sustainability in Higher Education | 2021 | |||
| 2022 | Public commitment to achieving net-zero carbon emissions by 2030 | |||
| Work begins on a new solar array planned for the south area of campus | 2023 |