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Seth Halvorsen played 2 major-league seasons (2024-2025) as a P (54). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 2 season lines
| Year | Age | Team | G | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | 24 | COL | 12 | 0 | 2 | 1 | 2 | 12.1 | 13 | 2 | 1.46 | 284 |
| 2025 | 25 | COL | 42 | 0 | 1 | 2 | 11 | 39.2 | 36 | 21 | 4.99 | 85 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 2024 | P | 12 | 0 | 1 | 0 | 0 | 0 |
| 2025 | P | 42 | 0 | 7 | 5 | 1 | 0 |
Team codes are the source codes (e.g. NYN for the New York Mets, BS1 for the 1875 Boston club). OPS+ is league-season normalized, not park-adjusted; unrecorded source values (such as RBI in the earliest recorded seasons) are absent, never zero-filled.
Seth Halvorsen is a playable Legends Deck card, rated from real Statcast data and refreshed nightly: view the Seth Halvorsen card.
Current-season Statcast leaderboard finishes: #11 fastball velocity.
Seth Halvorsen appears in 2 archived official MLB transactions (1 trade), newest first.
| Date | Type | From | To | Details |
|---|---|---|---|---|
| Jul 20, 2026 | Trade | Colorado Rockies | Los Angeles Dodgers | Colorado Rockies traded RHP Seth Halvorsen to Los Angeles Dodgers for RHP Nick Frasso and OF Landyn Vidourek. |
| Jul 18, 2023 | Signed | — | Colorado Rockies | Colorado Rockies signed RHP Seth Halvorsen. |
From MLB’s official StatsAPI transactions feed (2011 to the current season, trades/signings/releases involving major-league clubs). Browse the full archive.
Every career total and season line is computed from the SABR / Sean Lahman baseball database (2025 edition, CC BY-SA 3.0), the same source behind our historical position leaderboards. Rate stats use league-season normalization only (OPS+ and ERA+ as marked, never park-adjusted); unrecorded early-era values stay absent rather than being invented. Career totals sum only what the source records.
Award winners and MVP / Cy Young / Rookie of the Year voting history come from the same database; the year pages live under MLB award voting history. Official transactions (2011 to the current season) come from the MLB StatsAPI feed on our transactions archive.