Arctic foxes breed once per year, with mating occurring during March. After a gestation period of approximately 52 days, puppies are born in the dens. For the first three weeks, they remain below ground, and thereafter gradually spend more and more time aboveground. Each summer, all the puppies are trapped in order give them a health check, parasite medication, ear-tags, and a microchip. Cage traps are baited and attract the attention of the inquisitive young. After removal from the trap, handling time is kept to a minimum, whereafter the pups are returned to their enclosures.

The captive-reared offspring are trapped and transported to release sites in January/February each year, at approximately eight months of age. By this point they are as large as the adults and in no way dependent on their parents. The foxes are transported from the breeding station to a temporary holding facility near Oppdal. After receiving a health check and parasite medication, the foxes are loaded up and transported to their designated release sites. To maximise their post-release survival, supplementary feeding stations and artificial dens are deployed at release sites. To date, captive-reared foxes have been reintroduced into nine different populations across Norway (see map).