ERA

Jackson Kowar · Season-by-season history

ERA over time

Jackson Kowar — ERA over time Each point is a recorded season value. Separate lines show each team and competition. Exact values are listed in the table below. 0 2.25 4.51 6.76 9.02 11.27 2021 2022 2023 2025 2021 · Kansas City Royals · MLB: 11.27 2022 · Kansas City Royals · MLB: 9.77 2023 · Kansas City Royals · MLB: 6.43 2025 · Seattle Mariners · MLB: 4.24
  • Kansas City Royals · MLB
  • 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.

Jackson Kowar — ERA by season
SeasonTeamLeagueERA
2025 Seattle Mariners MLB 4.24
2023 Kansas City Royals MLB 6.43
2022 Kansas City Royals MLB 9.77
2021 Kansas City Royals MLB 11.27