Only mature ticks, engorged females and hungry imago hibernate in mountain regions of Armenia. According to the author's observations eggs of ticks as well as their larvae are not capable of hibernating. In females of spring satiation the development of eggs proceeds in most short periods from May to October. The longest period before the beginning of egg laying is observed in ticks of summer and autumn satiation. It becomes prolonged, in general, on account of hibernation of satiated females. Females of August-September satiation hibernate more successfully than females satiated in June and July.