ERA
George Kirby · Season-by-season history
ERA over time
- Seattle Mariners · MLB
Hover over a point for its value. Only numeric values with a recorded season are charted; missing seasons are not treated as zero.
| Season | Team | League | ERA |
|---|---|---|---|
| 2025 |  Seattle Mariners |
MLB | 4.21 |
| 2024 | Seattle Mariners |
MLB | 3.53 |
| 2023 | Seattle Mariners |
MLB | 3.35 |
| 2022 | Seattle Mariners |
MLB | 3.39 |