The schedule for Preliminary Engineering and Environmental Assessment of the KY 55 Heartland Parkway spans a five-year period. Many interdependent steps are involved in the process of integrating design with public involvement and environmental documentation. The major milestones for this project are as follows:
| Public Meeting No. 1 | October 2007 |
| Focus Group Meeting No. 1 | December 2007 |
| Public Meeting No. 2: Stage 1 Alternatives | March 2009 |
| Focus Group Meeting No. 2 | May 2009 |
| Public Meeting No. 3: Stage 2 Alternatives | September 2009 |
| Focus Group Meeting No. 3 | January 2011 |
| Approval of Environmental Base Studies | February 2011 |
| Approval of Environmental Assessment by FHWA | May 2011 |
| Public Hearings | September 2011 |
| Focus Group Meeting No. 4 | November 2011 |
| FHWA Approval of Preferred Alternative | August 2012 |