Was a commercial failure in Sweden due to not being able to find Swedish distributors. The biggest distributor in Sweden did not want to give it a big release and did not give it much promotion thinking it was too low quality. Ironically it was by far the most popular Swedish movie in international markets that year.
Daniel Ojanlatva comes from Kiruna, one of most northern towns in Sweden. He had a long relationship with perpetual darkness and thought that vampires showing up was just in order. Originally, the story was supposed to be a movie int the style of Pulp Fiction (1994) with several separate story's with characters walking in and out of them. In the end it was decided that there had to be a main character. In the end that became Saga.
During the filming the cast and crew where plagued by the extreme cold, with temperatures falling below 30 Celsius zero. During many scenes, the cameras broke down because of the cold and had to be warmed up. During her final fight scene 'Grete Havensköld' lost all feeling in her feet. She eventually started to cry and a sound tech had to take her into a van and warm her feet in his armpits. In another scene when Jonas Karlström was hanging in a lamppost covered in fake blood, it started to rain, despite being far below zero. The rain then froze on all the equipment and clothes, creating a layer of ice on everything. 'Anders Banke' referred to it like napalm, but with ice. During the final showdown with the cops and the vampires it also started to rain, creating the same problem.
Many of the character names are derived from mythology and religion: Lukas (the Swedish form of Luke), Joel and John are all names of books and characters in the Christian bible, Jacob is derived from the patriarch in the Old Testament and Sebastian is named after Saint Sebastian, the patron saint of plagues. Maria is the name of the mother of Jesus. In Christianity it's said that whoever comes to Jesus Christ and drinks his blood in the holy communion shall have life eternal. Maria is the progenitor of all the vampires in the film and her blood gives eternal life. Being a little child she is also obviously a virgin. In contrast, Saga is a Norse god. The word also means 'the one who sees' - the official website refers to Saga as a person who likes to study other people.
When the soldiers enter the cabin after their first fight with the vampires and run into the rotting corpse of one of their victims, the worms crawling in the body are real. Many escaped and the crew had to hunt them all down through the studio.
Kristian Persson was selected to play the part of The Shape, at one point called the Wraith, because he was tall, thin and had the uncanny ability to open his mouth wide much further than is usually possible. His costume took six weeks to make and took five hours to apply. Pehrsson had to wear the costume for at least 16 hours each day and it took over an hour to remove the costume.
The original design of the vampires resembled the chiropterans in Blood: The Last Vampire and was done with practical effects. However, the make-up prevented a lot of facial movement and it was decided that CGI was to be used instead and only on the teen vampires to make them different from the other vampires. This also allowed the transformation to be shown in camera. The chiropteran design was kept but toned down significantly.
Despite having plot similarities with 30 Days of Night (2007), and the fact that this movie even had 30 Days of Night as a second title in many countries, Frostbiten and 30 Days of Night have nothing to do with each other. However, it's worth noting that Frostbiten was in preproduction before the comic 30 Days of Night is based on was published.
Despite not having a big role in the movie, Jonas Lawes is credited above several of the actors that played main characters. Also, despite being top billed, Mikael Göransson and Jonas Karlström are bellow several of the minor characters. The credits can not be place in order of appearance and seem to be random.
Due to scheme complications there where only one month of pre-production, while a regular movie with the same amount of special effects would have six months of pre-production. In the end, all the effects shots where shot at the very end of the filming.