| | | |
| May 30, 2018 | L | Chico Heat 14 at San Francisco Seals 4 | Final |
| May 31, 2018 | L | Chico Heat 5 at San Francisco Seals 0 | Final |
| June 1, 2018 | L | San Francisco Seals 4 at Lincoln Potters 6 | Final |
| June 2, 2018 | W | San Francisco Seals 16 at Lincoln Potters 5 | Final (8) |
| June 3, 2018 | L | San Francisco Seals 6 at Lincoln Potters 7 | Final |
| June 4, 2018 | W | Medford Rogues 4 at San Francisco Seals 5 | Final |
| June 5, 2018 | | Medford Rogues at San Francisco Seals | Cancelled |
| June 8, 2018 | W | San Francisco Seals 12 at Yuba-Sutter Gold Sox 7 | Final |
| June 9, 2018 | L | San Francisco Seals 11 at Yuba-Sutter Gold Sox 20 | Final |
| June 12, 2018 | L | Lincoln Potters 8 at San Francisco Seals 3 | Final |
| June 13, 2018 | L | Lincoln Potters 10 at San Francisco Seals 8 | Final |
| June 15, 2018 | | Klamath Falls Gems at San Francisco Seals | Ppd. |
| June 16, 2018 | W | Klamath Falls Gems 7 at San Francisco Seals 8 (Game 1) | Final (7) |
| June 16, 2018 | W | Klamath Falls Gems 6 at San Francisco Seals 7 (Game 2) | Final (8) |
| June 17, 2018 | L | Klamath Falls Gems 4 at San Francisco Seals 0 | Final |
| June 19, 2018 | L | San Francisco Seals 5 at Yuba-Sutter Gold Sox 17 | Final |
| June 20, 2018 | L | San Francisco Seals 6 at Yuba-Sutter Gold Sox 10 | Final |
| June 21, 2018 | W | Yuba-Sutter Gold Sox 6 at San Francisco Seals 7 | Final |
| June 22, 2018 | L | Medford Rogues 10 at San Francisco Seals 0 | Final |
| June 23, 2018 | W | Medford Rogues 2 at San Francisco Seals 5 (Game 1) | Final (7) |
| June 23, 2018 | W | Medford Rogues 8 at San Francisco Seals 9 (Game 2) | Final (7) |
| June 24, 2018 | L | Medford Rogues 10 at San Francisco Seals 2 | Final |
| June 26, 2018 | L | San Francisco Seals 9 at Chico Heat 15 | Final |
| June 27, 2018 | L | San Francisco Seals 2 at Chico Heat 9 | Final |
| June 28, 2018 | L | San Francisco Seals 3 at Chico Heat 9 | Final |
| June 29, 2018 | W | San Francisco Seals 8 at Klamath Falls Gems 4 | Final |
| June 30, 2018 | L | San Francisco Seals 4 at Klamath Falls Gems 8 | Final |
| July 1, 2018 | L | San Francisco Seals 9 at Klamath Falls Gems 14 | Final |
| July 3, 2018 | L | Yuba-Sutter Gold Sox 10 at San Francisco Seals 4 | Final |
| July 4, 2018 | L | San Francisco Seals 4 at Yuba-Sutter Gold Sox 6 | Final |
| July 5, 2018 | W | San Francisco Seals 16 at Yuba-Sutter Gold Sox 3 | Final |
| July 6, 2018 | W | Lincoln Potters 12 at San Francisco Seals 13 | Final |
| July 7, 2018 | W | Lincoln Potters 4 at San Francisco Seals 5 (Game 1) | Final (11) |
| July 7, 2018 | W | Lincoln Potters 5 at San Francisco Seals 6 (Game 2) | Final (8) |
| July 8, 2018 | L | Lincoln Potters 11 at San Francisco Seals 8 | Final |
| July 9, 2018 | W | San Francisco Seals 7 at Medford Rogues 6 | Final |
| July 10, 2018 | L | San Francisco Seals 3 at Medford Rogues 11 | Final |
| July 11, 2018 | W | San Francisco Seals 3 at Medford Rogues 2 | Final |
| July 13, 2018 | L | Chico Heat 10 at San Francisco Seals 2 | Final |
| July 14, 2018 | W | Chico Heat 6 at San Francisco Seals 7 (Game 1) | Final (7) |
| July 14, 2018 | L | Chico Heat 7 at San Francisco Seals 4 (Game 2) | Final (7) |
| July 15, 2018 | W | Chico Heat 4 at San Francisco Seals 8 | Final |
| July 16, 2018 | L | San Francisco Seals 11 at Klamath Falls Gems 13 | Final |
| July 17, 2018 | W | San Francisco Seals 9 at Klamath Falls Gems 7 | Final |
| July 18, 2018 | W | San Francisco Seals 8 at Klamath Falls Gems 7 | Final |
| July 19, 2018 | L | San Francisco Seals 6 at Medford Rogues 27 | Final |
| July 20, 2018 | | San Francisco Seals at Medford Rogues | Ppd. |
| July 21, 2018 | | San Francisco Seals at Medford Rogues (Game 1) | Ppd. |
| July 21, 2018 | | San Francisco Seals at Medford Rogues (Game 2) | Ppd. |
| July 24, 2018 | | Klamath Falls Gems at San Francisco Seals | 10:05 p.m. |
| July 25, 2018 | L | Klamath Falls Gems 16 at San Francisco Seals 7 (Game 1) | Final (7) |
| July 25, 2018 | L | Klamath Falls Gems 11 at San Francisco Seals 0 (Game 2) | Final (7) |
| July 26, 2018 | W | Klamath Falls Gems 9 at San Francisco Seals 16 | Final |
| July 27, 2018 | L | San Francisco Seals 4 at Lincoln Potters 9 | Final |
| July 28, 2018 | L | San Francisco Seals 8 at Lincoln Potters 12 | Final |
| July 29, 2018 | L | San Francisco Seals 1 at Lincoln Potters 3 | Final |
| July 30, 2018 | L | San Francisco Seals 5 at Chico Heat 6 | Final |
| July 31, 2018 | L | San Francisco Seals 3 at Chico Heat 10 | Final |
| August 1, 2018 | W | San Francisco Seals 9 at Chico Heat 5 | Final |
| August 2, 2018 | W | Yuba-Sutter Gold Sox 3 at San Francisco Seals 4 | Final |
| August 3, 2018 | | Yuba-Sutter Gold Sox at San Francisco Seals | Cancelled |
| August 4, 2018 | | Yuba-Sutter Gold Sox at San Francisco Seals (Game 1) | Cancelled |
| August 4, 2018 | | Yuba-Sutter Gold Sox at San Francisco Seals (Game 2) | Cancelled |
San Francisco Seals Schedule
