The Spectrum Dynasty Football League is a dynasty fantasy football league consisting of 12 teams with 25 man rosters. Each team retains the full 25 man roster from year to year, and supplements their team in a three team rookie draft every summer. The league's first season corresponded to the 2013 NFL season.
The SDFL's inaugural season was 2013. Prior to the 2013 was the 25 round entry 2013 Draft for all 12 franchises. The 2014, 2015, 2016 seasons followed in succession, with a three round rookie draft occuring early in August prior to the start of the season. (2014, 2015, 2016)