What hurdle heights, distances and steeplechase barriers apply by age group?

AMA's National Championships Manual (July 2026) sets out these hurdle specifications as applying from 1 January 2026. Each entry is race distance, hurdle height and number of hurdles (outdoor races).

Women, short: 30-39: 100m, 0.840m, 10 hurdles. 40-49: 80m, 0.762m, 8. 50-59: 80m, 0.762m, 8. 60-69: 80m, 0.686m, 8. 70+: 80m, 0.686m, 8 (11m to the first hurdle, 6m between, 27m to the finish).
Women, long: 30-49: 400m, 0.762m, 10. 50-59: 300m, 0.762m, 7. 60-69: 300m, 0.686m, 7. 70+: 200m, 0.686m, 5.
Men, short: 30-49: 110m, 0.991m, 10. 50-59: 100m, 0.914m, 10. 60-69: 100m, 0.840m, 10. 70-79: 80m, 0.762m, 8. 80+: 80m, 0.686m, 8 (11m, 6m, 27m).
Men, long: 30-49: 400m, 0.914m, 10. 50-59: 400m, 0.840m, 10. 60-69: 300m, 0.762m, 7. 70-79: 300m, 0.686m, 7. 80+: 200m, 0.686m, 5.

The manual also lists 60m indoor hurdle races with 5 hurdles for each age group.

Steeplechase: women 30+ run 2000m with 0.762m barriers. Men 30-59 run 3000m with 0.914m barriers, and men 60+ run 2000m with 0.762m barriers. A 2000m steeple has 18 barriers and 5 water jumps, and a 3000m has 28 barriers and 7 water jumps. AMA's hurdles and steeplechase specification sheet adds that the barrier height for the 3000m shall be 0.838m, and that 0.914m is acceptable for competition and records.