It will probably come as no surprise to you, but at its current pace, home field advantage is at its lowest level in fifteen years.
Home-field advantage has been altered — at least reduced — for sure in 2020. Four weeks into the season, home teams are winning only 59.5% of their games (47-32). If that number holds, it would mark the worst winning percentage by home teams since 2005 (59.3%).
Ironically, the year following that (2004) marked the best home winning mark of all-time (65.3%), according to the NCAA, which has kept the statistic since 1966. In fact, home-field advantage has improved this century with the top 10 all-time coming since 2000.