The NNL split the season into two halves. Kansas City won the first half, St. Louis won the second half. The teams met at the end of the season in a best-of-9 playoff series to determine the Champion. The Negro National League and the Eastern Colored League faced each other in a Colored World Series at the end of the season to determine an overall champion.
NNL Pennant
World Series
STL 3
KC 5
Champ
HIL
1925 NNL1 Champion Hilldale Giants
z: best record, c: conference winner, y: division winner, w: wildcard, x: clinched playoff spot

League Pennant

Best of 9-game series
Date    OpponentResultScoreSeries
???at Kansas CityL  -0 0-1
???at Kansas CityL  -0 0-2
???vs Kansas CityW  0- 1-2
???vs Kansas CityW  0- 2-2
???vs Kansas CityW  0- 3-2
???at Kansas CityL  -0 3-3
???at Kansas CityL  -0 3-4
???at Kansas CityL  -0 3-5