| Milestone | Date |
| Phase 1 wings open | February 2022 |
| Phased Construction Begins | Spring 2020 |
| Detailed Design submitted to MSBA | January 2020 |
| Arlington voters approve the debt exclusion to pay for the new school | June 11, 2019 |
| MSBA approves Arlington’s Schematic Design | April 10, 2019 |
| Arlington submits Schematic Design to MSBA | February 20, 2019 |
| Schematic Design Phase | Aug. 2018-April 2019 |
| Arlington entered the Schematic Design phase after a unanimous vote of the Mass. School Building Authority (MSBA) board of directors | August 29, 2018 |
| Arlington submits Preferred Schematic Report (PSR) to MSBA | July 11, 2018 |
| AHS Building Committee votes Option 3a as Preferred Design Concept | June 26, 2018 |
| Arlington submits Preliminary Design Program (PDP) to MSBA | April 25, 2018 |
| AHS Building Committee selects 4 preliminary designs concepts to further explore | April 2018 |
| AHS Building Committee deemed a renovation-only option unsuitable | April 2018 |
| HMFH Architects presents 8 preliminary ‘massing’ concepts | March 2018 |
| AHS Building Committee evaluates alternate sites and determines current site is the most viable option | March 2018 |
| Public Forums Held | January – June 2018 |
| Educational Visioning sessions with AHS faculty, district leaders and community members | January & February 2018 |
| Feasibility Study | November 2017 |
| Designer Selected (HMFH Architects) | October 2017 |
| Owner’s Project Manager Selected (Skanska USA) | July 2017 |
| Feasibility Phase | February 2017 – August 2018 |
| AHS Building Committee Formed | September 2016 |
| Eligibility Period | June 8, 2016 through March 7, 2017 |
| Arlington voters approve $2M Debt Exclusion to pay for Feasibility Study | June 2016 |
| MSBA Invites AHS to commence Eligibility Period | May 25, 2016 |
| The MSBA decision to invite Arlington High School (AHS) into the School Building Grant Program | January 27, 2016 |
| Arlington submits Statement of Interest to Massachusetts School Building Authority (MSBA) | Submitted to MSBA May 2014 and again April 2015 |