team most era in one month, since 1900, min 30 ip

Since 1900, the Milwaukee Brewers have the highest ERA by a team when pitching at least 30 innings in a month, with an ERA of 12.27 in March 2025.

	TEAM	ERA	IP	MONTH	G	W%	W	L	SO	SHO	SV	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Brewers	12.27	33.0	March 2025	4	.000	0	4	28	0	0	48	45	47	17	21	5	1	172	1	7.64	5.73	1.33	4.64	16.3	12.2	2.09	.307	12.82	13.09
2	Diamondbacks	9.24	37.0	March 2019	4	.250	1	3	29	0	1	50	38	42	14	27	5	1	191	2	7.05	6.57	1.07	3.41	15.2	14.1	2.08	.310	10.22	12.16
3	Orioles	8.49	35.0	October 1986	4	.000	0	4	16	0	0	54	33	34	9	18	1	2	170	1	4.11	4.63	0.89	2.31	9.4	10.6	2.06	.357	8.74	13.89
4	Indians	8.45	33.0	October 1987	4	.250	1	3	17	0	1	51	31	37	9	15	1	1	170	0	4.64	4.09	1.13	2.45	10.0	8.8	2.00	.328	10.09	13.91
5	Indians	8.44	32.0	October 2009	4	.000	0	4	21	0	0	42	30	32	9	20	2	1	157	1	5.91	5.63	1.05	2.53	13.4	12.7	1.94	.314	9.00	11.81
6	Rockies	8.18	33.0	March 2024	4	.250	1	3	22	0	0	45	30	32	7	18	1	0	155	1	6.00	4.91	1.22	1.91	14.2	11.6	1.91	.355	8.73	12.27
7	Browns	8.04	103.0	April 1951	12	.333	4	8	46	0	1	128	92	94	14	87	6		517	1	4.02	7.60	0.53	1.22	8.9	16.8	2.09	.313	8.21	11.18
8	Athletics	7.97	245.0	April 2023	28	.179	5	23	206	0	2	300	217	229	50	141	24	4	1,176	18	7.57	5.18	1.46	1.84	17.5	12.0	1.80	.331	8.41	11.02
9	Athletics	7.56	125.0	April 1955	14	.429	6	8	56	2	1	148	105	115	25	91	9	9	603	5	4.03	6.55	0.62	1.80	9.3	15.1	1.91	.291	8.28	10.66
10	Diamondbacks	7.50	36.0	October 2015	4	.500	2	2	39	0	2	53	30	36	7	15	3	1	179	5	9.75	3.75	2.60	1.75	21.8	8.4	1.89	.400	9.00	13.25
11	White Sox	7.50	42.0	April 1995	5	.200	1	4	29	0	0	55	35	50	5	36	0	1	221	1	6.21	7.71	0.81	1.07	13.1	16.3	2.17	.331	10.71	11.79
12	Orioles	7.39	241.0	August 2021	28	.143	4	24	194	0	1	277	198	208	53	105	12	2	1,102	17	7.24	3.92	1.85	1.98	17.6	9.5	1.59	.304	7.77	10.34
13	Red Sox	7.36	33.0	March 2019	4	.250	1	3	40	0	1	42	27	34	11	19	2	0	166	1	10.91	5.18	2.11	3.00	24.1	11.4	1.85	.330	9.27	11.45
14	Twins	7.36	44.0	April 1995	5	.400	2	3	26	0	2	58	36	41	9	20	3	3	209	0	5.32	4.09	1.30	1.84	12.4	9.6	1.77	.325	8.39	11.86
15	Rangers	7.35	49.0	October 2001	6	.167	1	5	33	0	1	57	40	40	12	21	1	1	220	4	6.06	3.86	1.57	2.20	15.0	9.5	1.59	.294	7.35	10.47
16	Mariners	7.35	49.0	October 1985	6	.167	1	5	35	0	1	61	40	45	7	21	0	1	224	4	6.43	3.86	1.67	1.29	15.6	9.4	1.67	.335	8.27	11.20
17	Twins	7.34	220.2	April 1994	25	.360	9	16	125	1	6	312	180	198	49	102	9	7	1,056	11	5.10	4.16	1.23	2.00	11.8	9.7	1.88	.341	8.08	12.73
18	Pirates	7.33	229.2	June 1950	26	.280	7	18	89	1	3	293	187	209	42	121	4		1,084	11	3.49	4.74	0.74	1.65	8.2	11.2	1.80	.303	8.19	11.48
19	Twins	7.31	32.0	March 2025	4	.000	0	4	24	0	0	38	26	28	8	17	2	0	151	2	6.75	4.78	1.41	2.25	15.9	11.3	1.72	.300	7.88	10.69
20	Tigers	7.31	237.2	April 1996	27	.333	9	18	174	0	2	288	193	211	50	138	14	10	1,137	15	6.59	5.23	1.26	1.89	15.3	12.1	1.79	.313	7.99	10.91
21	Royals	7.16	236.1	July 1999	27	.407	11	16	135	0	7	297	188	197	41	138	16	7	1,127	13	5.14	5.26	0.98	1.56	12.0	12.2	1.84	.321	7.50	11.31
22	Rockies	7.13	252.1	August 2025	29	.379	11	18	204	0	5	320	200	204	54	104	18	4	1,172	6	7.28	3.71	1.96	1.93	17.4	8.9	1.68	.336	7.28	11.41
23	Nationals	7.13	48.0	October 2022	6	.167	1	5	43	0	0	59	38	41	13	22	2	1	225	2	8.06	4.13	1.95	2.44	19.1	9.8	1.69	.317	7.69	11.06
24	Rockies	7.03	258.2	May 1993	29	.241	7	22	164	0	4	343	202	221	38	119	8	10	1,221	16	5.71	4.14	1.38	1.32	13.4	9.7	1.79	.342	7.69	11.93
25	Tigers	7.00	234.0	June 1996	27	.370	10	17	145	2	4	287	182	187	43	138	17	13	1,106	13	5.58	5.31	1.05	1.65	13.1	12.5	1.82	.320	7.19	11.04