| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 12 | 9 | 0 | 0 | 158.0 | 151 | 25 | 157 | 66 | 3.78 | 1.114 | 45.1 |
| 2026 | 1 | 2 | 0 | 0 | 20.0 | 13 | 5 | 16 | 8 | 3.60 | 0.900 | 60.1 |
| 2025 | 10 | 8 | 0 | 0 | 126.0 | 121 | 29 | 137 | 59 | 4.21 | 1.190 | 33.8 |
| 2024 | 14 | 11 | 0 | 0 | 191.0 | 181 | 23 | 179 | 75 | 3.53 | 1.068 | 73.2 |
| Date | News |
| 4/07/26 | George Kirby tosses complete game, but Rangers hand Mariners fourth straight loss. George Kirby tossed eight strong innings, but his effort wasn't enough as the Mariners' offense couldn't find a clutch hit late in a 3-2 loss to the Rangers, Seattle's fourth straight defeat. Source: https://www.seattletimes.com/sports/mariners/georg... |
| 3/27/26 | Cole Young, Luke Raley homer for Mariners as George Kirby delivers quality start. The Mariners got a quality start from George Kirby along with homers from Cole Young and Luke Raley to pick up their first win of the season Friday night. Source: https://www.seattletimes.com/sports/mariners/cole-... |
| 3/21/26 | George Kirby shines, but Mariners lose to Cubs on sweltering night. George Kirby pitched into the sixth inning and allowed just one run on six hits, but the Mariners' offense was silent in a 7-1 spring loss to the Cubs on a sweltering Saturday night. Source: https://www.seattletimes.com/sports/mariners/georg... |
| 3/08/26 | Mariners’ George Kirby, looking for more conviction, experiments with calling pitches. George Kirby was actually calling his own pitches at various points Sunday during his second Cactus League start. If that sounds unusual, it is for the Mariners. Source: https://www.seattletimes.com/sports/mariners/marin... |
| 10/19/25 | ALCS: Mariners tap George Kirby to start elimination Game 7 vs. Blue Jays. After suffering a tough loss to the Blue Jays in Game 6, the Mariners face an elimination Game 7. Here's who they'll start in the biggest game in team history. Source: https://www.seattletimes.com/sports/mariners/alcs-... |
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