Toronto Blue Jays Earned Run Average Leaders

Career totals with the Blue Jays and the best single seasons in club history. Records run through the 2025 season.

Blue Jays records →

Jimmy Key holds the Blue Jays career record with 3.42 earned run average. The single-season record is 2.05, by Roger Clemens in 1997.

Rate records use the league's own minimums: a season needs the standard 1.0 inning per team game with the club, a career 1,000+ innings pitched with the club.

All-time Blue Jays leaders

Career totals with the club

#	Player	With the club	ERA	G
1	Jimmy Key	1984–1992	3.42	317
1	Dave Stieb	1979–1998	3.42	439
3	Roy Halladay	1998–2009	3.43	313
4	David Wells	1987–2000	4.06	306
5	Juan Guzman	1991–1998	4.07	195
6	Jim Clancy	1977–1988	4.10	352
7	Pat Hentgen	1991–2004	4.28	270
8	Todd Stottlemyre	1988–1994	4.39	206

Single-season Blue Jays records

Best seasons in club history

#	Player	Season	ERA	G
1	Roger Clemens	1997	2.05	34
2	Alek Manoah	2022	2.24	31
3	Dylan Cease	2026	2.40	29
4	Dave Stieb	1985	2.48	36
5	Juan Guzman	1992	2.64	28
6	Roger Clemens	1998	2.65	33
7	Hyun Jin Ryu	2020	2.69	12
8	Jimmy Key	1987	2.76	36
9	Roy Halladay	2008	2.78	34
10	Roy Halladay	2009	2.79	32
11	Dave Stieb	1984	2.83	35
12	Robbie Ray	2021	2.84	32
13	Ricky Romero	2011	2.92	32
14	Juan Guzman	1996	2.93	27
14	Roy Halladay	2002	2.93	34
14	Dave Stieb	1990	2.93	33
17	Jimmy Key	1985	3.00	35
17	Aaron Sanchez	2016	3.00	30
19	Dave Stieb	1983	3.04	36
19	Dave Stieb	1988	3.04	32
21	Jimmy Key	1991	3.05	33
22	JC John Cerutti	1989	3.07	33
23	Marcus Stroman	2017	3.09	33
24	Doyle Alexander	1984	3.13	36
24	Marco Estrada	2015	3.13	34