Jackson Kowar
Pitcher · Career Stats, Bio & Records (2021-2025)
Jackson Kowar is a pitcher who has played in Major League Baseball since 2021 for the Kansas City Royals and the Seattle Mariners, a span of 5 seasons. Across 54 career appearances, he has gone 4-6 with a 8.21 ERA and 90 strikeouts.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
- Position
- Pitcher
- Bats / Throws
- R / R
- Height / Weight
- 6'5" / 200 lb
- MLB Debut
- 2021-06-07
Full name: Jackson Alexander Kowar
Season-by-Season Pitching
Click a stat to plot it across every season.
| Year | Team | Lg | W | L | G | GS | CG | SHO | SV | IP | H | ER | BB | SO | ERA | Lg ERA | Pitcher PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | KCA | AL | 0 | 6 | 9 | 8 | 0 | 0 | 0 | 30.1 | 43 | 38 | 20 | 29 | 11.27 | 4.27 (-164%) | -1644.2 |
| 2022 | KCA | AL | 0 | 0 | 7 | 0 | 0 | 0 | 0 | 15.2 | 27 | 17 | 11 | 17 | 9.77 | 3.97 (-146%) | -939.8 |
| 2023 | KCA | AL | 2 | 0 | 23 | 0 | 0 | 0 | 0 | 28.0 | 34 | 20 | 20 | 29 | 6.43 | 4.33 (-48%) | -671.3 |
| 2025 | SEA | AL | 2 | 0 | 15 | 0 | 0 | 0 | 0 | 17.0 | 14 | 8 | 7 | 15 | 4.24 | 4.16 (-2%) | -715.1 |
| Career · 4 seasons | 4 | 6 | 54 | 8 | 0 | 0 | 0 | 91.0 | 118 | 83 | 58 | 90 | 8.21 | — | -3,970 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | KCA | AL | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2022 | KCA | AL | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2023 | KCA | AL | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | SEA | AL | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 4 seasons | 54 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | 0 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (108 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 24 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 30 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 24 | 46.2 | 56 | 36 | 22 | 48 | 6.94 |
| Away | 30 | 44.1 | 62 | 47 | 36 | 42 | 9.54 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2025-08-18 | SEA | PHI | — | 1.0 | 2 | 1 | 1 | 2 | 1 | 0 |
| 2025-08-17 | SEA | NYN | — | 1.0 | 1 | 0 | 0 | 1 | 2 | 0 |
| 2025-08-15 | SEA | NYN | — | 0.1 | 3 | 3 | 3 | 0 | 1 | 1 |
| 2025-08-14 | SEA | BAL | — | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2025-08-07 | SEA | CHW | W | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2025-08-05 | SEA | CHW | — | 1.0 | 2 | 2 | 2 | 0 | 1 | 2 |
| 2025-07-29 | SEA | OAK | — | 2.0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2025-07-27 | SEA | LAA | — | 1.0 | 1 | 0 | 0 | 1 | 0 | 0 |
| 2025-06-14 | SEA | CLE | W | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2025-06-10 | SEA | AZ | — | 2.0 | 1 | 1 | 1 | 0 | 3 | 1 |
Fielding Statistics
Career Fielding Totals by Position
Season-by-Season Fielding
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 54 |
Jackson Kowar: the record in brief
Jackson Kowar made a major league debut on June 7, 2021 and is still active, so the totals on this page keep changing. By club, Kowar's seasons break down as the Kansas City Royals (2021 through 2023) and the Seattle Mariners (2025). Listed as a pitcher, Kowar threw and hit right-handed. Kowar is listed at 200 pounds on a 6-foot-5 frame. The birth record reads October 4, 1996, in Weddington, NC, USA. On the record, Jackson Kowar was born Jackson Alexander Kowar.
Kowar has gone 4-6 with a 8.21 ERA in 54 games, 8 of them starts. Also on Kowar's record: 90 strikeouts. Against a 4.18 league ERA for the same seasons, the 8.21 mark was 96.3% worse. In 2023, one of the busiest seasons, Kowar posted a 6.43 ERA; the league figure that year was 4.33.
The game-log section draws on 108 games of Retrosheet box scores for Kowar.
Kowar appears at one position only: pitcher, in 54 games. Fielding on the mound produced 1 putouts and 12 assists against 0 errors.
Frequently Asked Questions about Jackson Kowar
- What years did Jackson Kowar play?
- Jackson Kowar played in Major League Baseball from 2021 to 2025.
- Was Jackson Kowar a pitcher?
- Yes. Jackson Kowar pitched in the major leagues, recording 4 wins and 90 strikeouts.
- What was Jackson Kowar's career ERA?
- Jackson Kowar finished with a 8.21 career ERA, going 4-6 with 90 strikeouts.
- How many strikeouts did Jackson Kowar have?
- Jackson Kowar recorded 90 career strikeouts.
- Is Jackson Kowar in the Hall of Fame?
- No. Jackson Kowar has not been inducted into the National Baseball Hall of Fame.
- What teams did Jackson Kowar play for?
- Jackson Kowar played for the Kansas City Royals and the Seattle Mariners.