The life cycle involves several significant stages, minimally including wintering, lek attendance, nesting, and brood rearing.
In Colorado and likely Utah, males display on leks from mid-March through late May, depending on elevation and conditions (Rogers 1964). Females visit leks, mate with one or more males, then depart to begin nesting. Clutch size averages around 6-7 (Young 1994, USFWS 2010). Incubation, by the female alone, lasts about 4 weeks. Hatching begins around mid-May and may extend into July; the peak usually is in mid-June (Gunnison Sage-grouse Rangewide Steering Committee 2005). Chicks leave the nest with the female shortly after hatching. Females infrequently renest if they lose their first nest.
In greater sage-grouse (Centrocerus urophasianus), yearling males are capable of breeding, but most breeding is done by older males; yearling females often breed but somewhat less frequently than do older females (see Schroeder et al. 1999). Typical sage-grouse life span is 3-6 years, sometimes up to 9 years (Connelly et al. 2004).