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Red Deer in Europe generally spend their winters in lower altitudes and more wooded terrain. During the summer, they migrate to higher elevations where food supplies are greater for the calving season

Mature Red Deer usually stay in single-sex groups for most of the year. During the mating ritual, called the rut, mature stags compete for the attentions of the hinds and will then try to defend hinds that they attract. Rival stags challenge opponents by bellowing and walking in parallel. This allows combatants to assess each other's antlers, body size and fighting prowess. If neither stag backs down a clash of antlers can occur, and stags sometimes sustain serious injuries.

Dominant stags follow groups of hinds during the rut, from August into early winter. The stags may have as many as 20 hinds to keep from other less attractive males. Only mature stags hold harems (groups of hinds) and breeding success peaks at about 8 years of age. Stags 2-4 years old rarely hold harems and spend most of the rut on the periphery of larger harems, as do stags over 11 years old. Young and old stags that do acquire a harem hold it later in the breeding season than those stags in their prime. Harem holding stags rarely feed and lose up to 20% of their body weight. Stags that enter the rut in poor condition are less likely to make it through to the peak conception period.

Male European Red Deer have a distinctive "roar" during the rut, which is an adaptation to forested environments as oppose to Male Wapiti (or American Elk) which "bugle" during the rut, which is an adaptation to open environments. The male deer "roars" to keep his harem of females together. The females are initially attracted to those males that both roar most often and have the loudest roar call. Males also use the roar call when competing with other males for females during the rut, and along with other forms of posturing and antler fights, is a method used by the males to establish dominance. Roaring is most common during the early dawn and late evening.

Red Deer mating patterns usually involve a dozen of more mating attempts before the first successful one. There may be several more matings before the stag will seek out another mate in his harem. Females in their second autumn can produce one and very rarely two offspring per year. The gestation period is 240 and 262 days and the offspring weigh between 15 and 16 kilograms (33 to 35 lb). After two weeks, calves are able to join the herd and are fully weaned after two months. Female offspring outnumber male offspring more than two to one and all Red Deer calves are born spotted, as is common with many deer species, and lose their spots by the end of summer. However, as in many species of Old World Deer, some adults do retain a few spots on the backs of their summer coats. The offspring will remain with their mothers for almost one full year, leaving around the time that the next season offspring are produced. The gestation period is the same for all subspecies.

Red Deer live up to over 20 years in captivity and average 10 to 13 years in the wild, though some subspecies that have less predation pressure average 15 years.