36 pitchers are tied for the best ERA when pitching at least 30 innings in a month, with an ERA of 0.00. The first three are Orel Hershiser in September 1988, Dwight Gooden in September 1985 and Mack Allison in September 1912.
| NAME | ERA | IP | MONTH | G | W | L | W% | GS | SO | CG | SHO | SV | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | O. Hershiser | 0.00 | 55.0 | September 1988 | 6 | 5 | 0 | 1.000 | 6 | 34 | 5 | 5 | 0 | 30 | 0 | 0 | 0 | 9 | 0 | 0 | 3 | 201 | 1 | 5.56 | 1.47 | 3.78 | 0.00 | 16.9 | 4.5 | 0.71 | .190 | 0.00 | 4.91 |
| 2 | | D. Gooden | 0.00 | 44.0 | September 1985 | 5 | 3 | 0 | 1.000 | 5 | 39 | 2 | 2 | 0 | 24 | 0 | 1 | 0 | 9 | 0 | 0 | 1 | 164 | 0 | 7.98 | 1.84 | 4.33 | 0.00 | 23.8 | 5.5 | 0.75 | .207 | 0.20 | 4.91 |
| 3 | | M. Allison | 0.00 | 41.0 | September 1912 | 8 | 1 | 4 | .200 | 5 | 10 | 2 | 1 | 1 | 44 | 21 | 1 | 11 | 4 | 3 | 175 | 5 | 2.20 | 2.41 | 0.91 | 0.22 | 5.7 | 6.3 | 1.34 | .289 | 4.61 | 9.66 | ||
| 4 | | R. Collins | 0.00 | 45.0 | September 1912 | 5 | 3 | 2 | .600 | 5 | 18 | 5 | 1 | 0 | 45 | 13 | 1 | 12 | 0 | 0 | 189 | 0 | 3.60 | 2.40 | 1.50 | 0.20 | 9.5 | 6.3 | 1.27 | .278 | 2.60 | 9.00 | ||
| 5 | | B. Brown | 0.00 | 51.0 | September 1912 | 9 | 5 | 1 | .833 | 5 | 18 | 5 | 1 | 0 | 50 | 32 | 0 | 22 | 1 | 2 | 218 | 3 | 3.18 | 3.88 | 0.82 | 0.00 | 8.3 | 10.1 | 1.41 | .282 | 5.65 | 8.82 | ||
| 6 | | W. Mitchell | 0.00 | 42.1 | September 1912 | 6 | 2 | 2 | .500 | 4 | 30 | 2 | 0 | 1 | 37 | 18 | 0 | 12 | 3 | 2 | 177 | 0 | 6.38 | 2.55 | 2.50 | 0.00 | 16.9 | 6.8 | 1.16 | .280 | 3.83 | 7.87 | ||
| 7 | | E. Plank | 0.00 | 55.0 | September 1912 | 7 | 5 | 1 | .833 | 5 | 25 | 4 | 1 | 1 | 33 | 13 | 0 | 21 | 1 | 2 | 218 | 2 | 4.09 | 3.44 | 1.19 | 0.00 | 11.5 | 9.6 | 0.98 | .193 | 2.13 | 5.40 | ||
| 8 | | C. Weilman | 0.00 | 41.0 | September 1912 | 6 | 2 | 3 | .400 | 5 | 23 | 5 | 2 | 1 | 29 | 12 | 0 | 1 | 0 | 1 | 1 | 5.05 | 0.22 | 23.00 | 0.00 | 0.6 | 0.73 | .218 | 2.63 | 6.37 | ||||
| 9 | | B. Houck | 0.00 | 42.1 | August 1912 | 8 | 1 | 1 | .500 | 3 | 17 | 1 | 0 | 1 | 37 | 16 | 1 | 18 | 1 | 5 | 173 | 4 | 3.61 | 3.83 | 0.94 | 0.21 | 9.8 | 10.4 | 1.30 | .265 | 3.40 | 7.87 | ||
| 10 | | R. Collins | 0.00 | 48.0 | August 1912 | 7 | 4 | 2 | .667 | 7 | 21 | 3 | 2 | 0 | 40 | 12 | 0 | 6 | 0 | 0 | 192 | 0 | 3.94 | 1.13 | 3.50 | 0.00 | 10.9 | 3.1 | 0.96 | .242 | 2.25 | 7.50 | ||
| 11 | | E. Plank | 0.00 | 45.0 | August 1912 | 6 | 4 | 2 | .667 | 6 | 27 | 5 | 2 | 0 | 44 | 14 | 0 | 11 | 0 | 0 | 182 | 1 | 5.40 | 2.20 | 2.45 | 0.00 | 14.8 | 6.0 | 1.22 | .306 | 2.80 | 8.80 | ||
| 12 | | H. Bedient | 0.00 | 56.0 | August 1912 | 8 | 4 | 1 | .800 | 7 | 31 | 5 | 0 | 0 | 58 | 23 | 2 | 14 | 0 | 0 | 244 | 2 | 4.98 | 2.25 | 2.21 | 0.32 | 12.7 | 5.7 | 1.29 | .284 | 3.70 | 9.32 | ||
| 13 | | C. Hall | 0.00 | 39.0 | August 1912 | 7 | 2 | 1 | .667 | 1 | 15 | 0 | 0 | 0 | 39 | 15 | 1 | 10 | 1 | 6 | 159 | 0 | 3.46 | 2.31 | 1.50 | 0.23 | 9.4 | 6.3 | 1.26 | .288 | 3.46 | 9.00 | ||
| 14 | | R. Caldwell | 0.00 | 68.1 | August 1912 | 9 | 4 | 3 | .571 | 8 | 28 | 7 | 2 | 0 | 71 | 27 | 0 | 14 | 1 | 1 | 2 | 3.69 | 1.84 | 2.00 | 0.00 | 4.8 | 1.24 | .285 | 3.56 | 9.35 | ||||
| 15 | | E. Hamilton | 0.00 | 62.1 | August 1912 | 10 | 4 | 3 | .571 | 7 | 27 | 6 | 1 | 0 | 39 | 23 | 1 | 22 | 3 | 2 | 248 | 1 | 3.90 | 3.18 | 1.23 | 0.14 | 10.9 | 8.9 | 0.98 | .195 | 3.32 | 5.63 | ||
| 16 |  | W. Johnson | 0.00 | 68.1 | August 1912 | 12 | 8 | 2 | .800 | 6 | 61 | 5 | 2 | 1 | 40 | 11 | 0 | 13 | 1 | 6 | 2 | 8.03 | 1.71 | 4.69 | 0.00 | 5.2 | 0.78 | .230 | 1.45 | 5.27 | ||||
| 17 | | B. O'Brien | 0.00 | 59.2 | July 1912 | 7 | 5 | 2 | .714 | 6 | 20 | 6 | 1 | 0 | 41 | 13 | 1 | 7 | 1 | 1 | 223 | 1 | 3.02 | 1.06 | 2.86 | 0.15 | 9.0 | 3.1 | 0.80 | .206 | 1.96 | 6.18 | ||
| 18 | | E. Plank | 0.00 | 44.0 | July 1912 | 7 | 5 | 2 | .714 | 5 | 14 | 4 | 0 | 0 | 39 | 19 | 0 | 13 | 0 | 2 | 179 | 1 | 2.86 | 2.66 | 1.08 | 0.00 | 7.8 | 7.3 | 1.18 | .257 | 3.89 | 7.98 | ||
| 19 | | J. Wood | 0.00 | 51.2 | July 1912 | 7 | 5 | 1 | .833 | 6 | 42 | 5 | 1 | 0 | 41 | 15 | 0 | 10 | 4 | 1 | 204 | 3 | 7.32 | 1.74 | 4.20 | 0.00 | 20.6 | 4.9 | 0.99 | .277 | 2.61 | 7.14 | ||
| 20 | | H. Vaughn | 0.00 | 46.2 | July 1912 | 7 | 4 | 0 | 1.000 | 5 | 34 | 3 | 0 | 0 | 39 | 16 | 0 | 22 | 2 | 2 | 195 | 7 | 6.56 | 4.24 | 1.55 | 0.00 | 17.4 | 11.3 | 1.31 | .285 | 3.09 | 7.52 | ||
| 21 | | J. Baskette | 0.00 | 35.2 | July 1912 | 6 | 1 | 2 | .333 | 2 | 16 | 2 | 0 | 1 | 38 | 24 | 0 | 12 | 4 | 4 | 162 | 2 | 4.04 | 3.03 | 1.33 | 0.00 | 9.9 | 7.4 | 1.40 | .292 | 6.06 | 9.59 | ||
| 22 | | J. Dubuc | 0.00 | 63.0 | July 1912 | 8 | 7 | 0 | 1.000 | 6 | 18 | 6 | 1 | 1 | 48 | 21 | 0 | 36 | 1 | 2 | 4 | 2.57 | 5.14 | 0.50 | 0.00 | 13.5 | 1.33 | .227 | 3.00 | 6.86 | ||||
| 23 | | B. Houck | 0.00 | 70.2 | July 1912 | 9 | 4 | 3 | .571 | 8 | 32 | 7 | 0 | 0 | 58 | 32 | 0 | 25 | 4 | 1 | 294 | 1 | 4.08 | 3.18 | 1.28 | 0.00 | 10.9 | 8.5 | 1.17 | .249 | 4.08 | 7.39 | ||
| 24 | | T. Hughes | 0.00 | 45.1 | July 1912 | 7 | 3 | 2 | .600 | 6 | 25 | 2 | 1 | 0 | 49 | 23 | 1 | 18 | 2 | 1 | 195 | 0 | 4.96 | 3.57 | 1.39 | 0.20 | 12.8 | 9.2 | 1.48 | .322 | 4.57 | 9.73 | ||
| 25 | | J. Powell | 0.00 | 53.2 | July 1912 | 7 | 2 | 4 | .333 | 6 | 14 | 5 | 0 | 0 | 58 | 28 | 1 | 8 | 1 | 1 | 226 | 1 | 2.35 | 1.34 | 1.75 | 0.17 | 6.2 | 3.5 | 1.23 | .282 | 4.70 | 9.73 | ||
StatMuse has game-level data for ERA and innings pitched going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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 Dodgers | 26 | 18 | .591 | |
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18 | 26 | .409 | 8.0 | |
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30 | 14 | .682 | ||
21 | 23 | .477 | 9.0 | |
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28 | 16 | .636 | ||
24 | 17 | .585 | 2.5 | |
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26 | 18 | .591 | ||
25 | 18 | .581 | 0.5 | |
20 | 22 | .476 | 5.0 | |
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17 | 27 | .386 | 9.0 |
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Cardinals
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|---|---|---|---|---|
28 | 14 | .667 | ||
27 | 17 | .614 | 2.0 | |
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24 | 21 | .533 | ||
22 | 21 | .512 | 1.0 | |
20 | 24 | .455 | 3.5 | |
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19 | 25 | .432 | 4.5 | |
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22 | 21 | .512 | ||
22 | 23 | .489 | 1.0 | |
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