How to read this player page

The big number is his career NUT, his total production against league average, with its letter grade. This season's NUT sits just below it, followed by his season and career lines, recent form over 7, 14 and 30 days, game logs, and percentile ranks against every qualified player. NUT is built on the advanced hitting and pitching stats analysts trust, with defense left out, so the number reflects what the player controls.

Aaron Cook 2026 Season · Colorado Springs Sky Sox

Aaron Cook is a free agent pitcher. His career NUT is -2.5, #6,247 of 7,125 pitchers since 1876, and his best season by NUT was 2008 (+1.3). NUT is one number for production against league average: 0.0 is average, and every season is graded against its own league.

Career: 76-79, 4.60 ERA, 578 K in 1406.1 IP.

NUT leaderboard · What is NUT?

Aaron Cook Career Stats & NUT | Baseball NUT

Aaron Cook

#28

P · Free agent

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-2.5Career NUT

+0.5 to Weak

Career

4.60ERA1.47WHIP76W578K1406.1IP

Career · season grades

R/R · 6' 3", 215 lb · b. Feb 8, 1979 · Fort Campbell, KY · Draft 1997 (2nd Rd, #70)

Player Overview

Year by Year


2002	23	COL	-0.2	2	1	4.54	9	5	0	0	1	1	154	35.2	41	18	13	2	14	1.51
2003	24	COL	-0.5	4	6	6.02	43	16	1	0	4	1	579	124.0	160	83	57	8	43	1.75
2004	25	COL	-0.1	6	4	4.28	16	16	1	0	0	0	433	96.2	112	46	39	7	40	1.56
2005	26	COL	+0.0	7	2	3.67	13	13	2	0	0	0	357	83.1	101	34	16	2	24	1.40
2006	27	COL	+0.8	9	15	4.23	32	32	0	0	0	0	915	212.2	242	100	55	7	92	1.40
2007	28	COL	-0.2	8	7	4.12	25	25	2	0	0	0	698	166.0	178	76	44	6	61	1.34
2008	29	COL	+1.3	16	9	3.96	32	32	2	1	0	0	886	211.1	236	93	48	4	96	1.34
2009	30	COL	-0.5	11	6	4.16	27	27	1	1	0	0	675	158.0	175	73	47	2	78	1.41
2010	31	COL	-0.7	6	8	5.08	23	23	2	0	0	0	572	127.2	147	72	52	4	62	1.56
2011	32	COL	-0.7	3	10	6.03	18	17	0	0	0	0	441	97.0	127	65	37	5	48	1.69
2012	33	BOS	-1.6	4	11	5.65	18	18	1	1	0	0	411	94.0	117	59	21	1	20	1.47
Career	—	11 yrs	-2.5	76	79	4.60	256	224	12	3	5	2	6121	1406.1	1636	719	429	48	578	1.47

Stat definitions →

NUT Breakdown

K Ability

HR Prevention

Walk Avoidance

What's driving Cook's career NUT of -2.5

Slice size = share of total NUT. K Ability = Strikeouts · HR Prevention = HR allowed · Walk Avoidance = BB + HBP.

Career NUT Trend

1.3

0203040506070809101112

NUT by Season

-0.2

-0.5

-0.1

+0.0

+0.8

-0.2

+1.3

-0.5

-0.7

-1.6

Awards

2002Futures Game Selection

2005Tony Conigliaro Award

2008NL All-Star

Minor League

Year	Age	Lv	W	L	ERA	G	GS	CG	SHO	BF	IP	H	ER	BB	HBP	SO	WHIP
1999	20	A	4	12	6.44	25	25	2	0	561	121.2	157	87	42	9	73	1.64
2000	21	A	10	7	2.96	21	21	4	2	579	142.2	130	47	23	16	118	1.07
2000	21	A+	1	6	5.44	7	7	1	0	196	43.0	52	26	12	7	37	1.49
2001	22	A+	11	11	3.08	27	27	0	0	649	155.0	157	53	38	7	122	1.26
2002	23	AA	7	2	1.42	14	14	2	2	370	95.0	73	15	19	5	58	0.97
2002	23	AAA	4	4	3.78	10	10	1	0	275	64.1	67	27	18	3	32	1.32
2003	24	AAA	1	1	2.25	2	2	1	0	61	16.0	10	4	4	0	12	0.88
2004	25	AAA	3	1	2.74	7	7	1	1	177	46.0	34	14	8	3	25	0.91
2005	26	A+	1	0	1.80	1	1	0	0	19	5.0	5	1	0	0	5	1.00
2005	26	AA	0	1	17.18	1	1	0	0	22	3.2	10	7	1	0	1	3.00
2005	26	AAA	1	0	5.51	3	3	0	0	72	16.1	18	10	7	1	11	1.53
2007	28	AAA	0	1	27.00	1	1	0	0	8	1.0	4	3	1	0	0	5.00
2010	31	AA	1	1	2.53	2	2	0	0	41	10.2	8	3	3	0	10	1.03
2011	32	AA	0	1	5.79	3	3	0	0	58	14.0	16	9	3	0	13	1.36
2011	32	AAA	1	0	5.52	2	2	0	0	57	14.2	13	9	2	0	5	1.02
2012	33	AAA	3	0	2.41	6	6	2	0	153	37.1	33	10	12	0	16	1.21
2013	34	AAA	0	5	8.15	8	8	0	0	172	35.1	56	32	11	2	22	1.90

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