The San Francisco Giants had the lowest ERA by a team in May 2025, with an ERA of 2.64.

	TEAM	ERA	MONTH	G	W%	W	L	SO	SHO	SV	IP	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	Giants	2.64	May 2025	27	.481	13	14	230	0	6	238.2	196	70	85	17	71	8	3	970	10	8.67	2.68	3.24	0.64	23.7	7.3	1.12	.278	3.21	7.39
2	Rangers	2.98	May 2025	28	.429	12	16	201	0	6	244.1	196	81	88	26	90	5	1	1,006	8	7.40	3.32	2.23	0.96	20.0	8.9	1.17	.249	3.24	7.22
3	Mets	3.08	May 2025	27	.556	15	12	226	0	7	240.0	194	82	96	24	114	11	2	1,020	11	8.48	4.27	1.98	0.90	22.2	11.2	1.28	.264	3.60	7.28
4	Braves	3.08	May 2025	27	.481	13	14	250	0	4	242.2	205	83	94	25	82	15	3	1,000	5	9.27	3.04	3.05	0.93	25.0	8.2	1.18	.287	3.49	7.60
5	Twins	3.11	May 2025	26	.692	18	8	237	0	10	234.2	204	81	86	21	60	12	4	958	6	9.09	2.30	3.95	0.81	24.7	6.3	1.13	.291	3.30	7.82
6	Royals	3.12	May 2025	28	.536	15	13	227	0	8	251.0	230	87	92	29	60	8	2	1,023	11	8.14	2.15	3.78	1.04	22.2	5.9	1.16	.288	3.30	8.25
7	Cardinals	3.40	May 2025	27	.704	19	8	206	1	11	238.0	228	90	99	20	69	11	1	1,003	9	7.79	2.61	2.99	0.76	20.5	6.9	1.25	.298	3.74	8.62
8	Tigers	3.46	May 2025	28	.679	19	9	257	1	8	252.2	219	97	105	27	73	12	3	1,038	6	9.15	2.60	3.52	0.96	24.8	7.0	1.16	.287	3.74	7.80
9	Yankees	3.49	May 2025	26	.654	17	9	254	0	8	232.0	201	90	93	23	76	6	1	967	12	9.85	2.95	3.34	0.89	26.3	7.9	1.19	.293	3.61	7.80
10	Cubs	3.63	May 2025	27	.667	18	9	221	0	8	242.2	217	98	104	33	63	9	1	985	8	8.20	2.34	3.51	1.22	22.4	6.4	1.15	.279	3.86	8.05
11	Rays	3.66	May 2025	28	.571	16	12	187	0	6	248.2	225	101	104	38	73	11	0	1,022	3	6.77	2.64	2.56	1.38	18.3	7.1	1.20	.262	3.76	8.14
12	Pirates	3.70	May 2025	28	.357	10	18	195	0	5	245.2	216	101	107	21	91	12	3	1,025	6	7.14	3.33	2.14	0.77	19.0	8.9	1.25	.276	3.92	7.91
13	Blue Jays	3.73	May 2025	28	.571	16	12	248	0	10	248.1	213	103	111	37	73	8	2	1,014	3	8.99	2.65	3.40	1.34	24.5	7.2	1.15	.272	4.02	7.72
14	Reds	3.82	May 2025	28	.464	13	15	225	0	6	247.2	237	105	111	23	86	13	3	1,053	9	8.18	3.13	2.62	0.84	21.4	8.2	1.30	.303	4.03	8.61
15	Guardians	3.85	May 2025	27	.519	14	13	234	0	7	238.2	229	102	110	26	101	9	2	1,028	6	8.82	3.81	2.32	0.98	22.8	9.8	1.38	.309	4.15	8.64
16	Red Sox	3.88	May 2025	28	.393	11	17	222	0	4	252.2	254	109	121	27	94	12	4	1,089	11	7.91	3.35	2.36	0.96	20.4	8.6	1.38	.309	4.31	9.05
17	Brewers	3.94	May 2025	28	.536	15	13	232	0	8	251.1	236	110	119	28	92	9	5	1,069	7	8.31	3.29	2.52	1.00	21.7	8.6	1.31	.294	4.26	8.45
18	White Sox	4.02	May 2025	28	.393	11	17	188	0	4	239.2	230	107	117	26	94	16	4	1,043	6	7.06	3.53	2.00	0.98	18.0	9.0	1.35	.284	4.39	8.64
19	Phillies	4.07	May 2025	28	.679	19	9	269	0	12	254.0	246	115	122	27	90	6	3	1,078	5	9.53	3.19	2.99	0.96	25.0	8.3	1.32	.319	4.32	8.72
20	Mariners	4.11	May 2025	27	.481	13	14	205	0	7	245.1	262	112	125	33	72	17	5	1,062	5	7.52	2.64	2.85	1.21	19.3	6.8	1.36	.312	4.59	9.61
21	Marlins	4.25	May 2025	26	.423	11	15	210	0	6	230.2	222	109	121	27	77	8	4	979	7	8.19	3.00	2.73	1.05	21.5	7.9	1.30	.297	4.72	8.66
22	Astros	4.27	May 2025	28	.536	15	13	276	0	6	242.2	213	115	120	30	98	10	2	1,033	10	10.24	3.63	2.82	1.11	26.7	9.5	1.28	.296	4.45	7.90
23	Dodgers	4.39	May 2025	27	.556	15	12	238	0	6	242.0	231	118	124	44	85	13	9	1,028	10	8.85	3.16	2.80	1.64	23.2	8.3	1.31	.289	4.61	8.59
24	Padres	4.44	May 2025	26	.500	13	13	226	1	7	233.0	219	115	132	34	85	12	3	993	5	8.73	3.28	2.66	1.31	22.8	8.6	1.30	.291	5.10	8.46
25	Angels	4.73	May 2025	28	.500	14	14	215	0	5	249.0	266	131	141	39	119	11	10	1,113	14	7.77	4.30	1.81	1.41	19.3	10.7	1.55	.311	5.10	9.61