Example limits for number of pitches thrown in games

Age2006 USA Baseball Guidelines2010 Little League Baseball Regulations
Daily Limits
17-18N/A105/day
15-16N/A95/day
13-1475/game95/day
11-1275/game85/day
9-1050/game75/day
7-8N/A50/day
Weekly Limits
15-18N/A31-45 pitches = 1 day rest
46-60 pitches = 2 days rest
61-75 pitches = 3 days rest
76+    pitches = 4 days rest
13-14125/week; 1000/season; 3000/year21-35 pitches = 1 day rest
36-50 pitches = 2 days rest
51-65 pitches = 3 days rest
66+    pitches = 4 days rest
11-12100/week; 1000/season; 3000/year
9-1075/week; 1000/season; 2000/year
7-8N/A

For high school pitch count rules by state, click here.

For further discussion on this topic, visit the ASMI Forum.

References:

  • Dun S, Loftice J, Fleisig GS, Kingsley D, Andrews JR. A biomechanical comparison of youth baseball pitches: is the curveball potentially harmful? Am J Sports Med. 2008; 36(4):686-692.
  • Fleisig GS, Andrews JR, Cutter GR, Weber A, Loftice J, McMichael C, Hassell N, Lyman S. Risk of serious injury for young baseball pitchers: a 10-year prospective study. Am J Sports Med. 2011; 39(2):253-257.
  • Fleisig GS, Andrews JR, Dillman CJ, Escamilla RF. Kinetics of baseball pitching with implications about injury mechanisms. Am J Sports Med. 1995; 23:233-239.
  • Fleisig GS, Weber A, Hassell N, Andrews JR. Prevention of elbow injuries in youth baseball pitchers. Curr Sports Med Rep 2009; 8(5):250-254.
  • Lyman S, Fleisig GS, Andrews JR, Osinski ED. Effect of pitch type, pitch count, and pitching mechanics on risk of elbow and shoulder pain in youth baseball pitchers. Am J Sports Med. 2002; 30(4):463-468.
  • Matsuo T, Fleisig GS, Zheng N, Andrews JR. Influence of shoulder abduction and lateral trunk tilt on peak elbow varus torque for college baseball pitchers during simulated pitching. J Appl Biomech. 2006; 22(2): 93-102.
  • Nissen CW, Westwell M, Õunpuu S, Patel M, Solomito M, Tate J. A biomechanical comparison of the fastball and curveball in adolescent baseball pitchers. Am J Sports Med. 2009 37(8):1492-1498.
  • Olsen SJ, Fleisig GS, Dun S, Loftice J, Andrews JR. Risk factors for shoulder and elbow injuries in adolescent baseball pitchers. Am J Sports Med. 2006; 34(6):905-912.
  • Petty DH, Andrews JR, Fleisig GS, et al. Ulnar collateral ligament reconstruction in high school baseball players: clinical results and injury risk factors. Am J Sports Med 2004; 32:1158-1164.