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
???vs St. LouisW  0- 1-0
???vs St. LouisW  0- 2-0
???at St. LouisL  -0 2-1
???at St. LouisL  -0 2-2
???at St. LouisL  -0 2-3
???vs St. LouisW  0- 3-3
???vs St. LouisW  0- 4-3
???vs St. LouisW  0- 5-3

Colored World Series

Best of 9-game series
Date    OpponentResultScoreSeries
10/1vs HilldaleL  2-5
12
0-1
10/2vs HilldaleW  5-3 1-1
10/3vs HilldaleL  1-3
10
1-2
10/4vs HilldaleL  3-7 1-3
10/8at HilldaleL  1-2 1-4
10/10at HilldaleL  2-5 1-5
10/11at HilldaleW  6-1 2-5