Here some news. It is what can survive to -10F for a week with 1 meter of snow for protection:
Dionaea muscipula: All survived (really resistant to cold)
Drosera filiformis: Survived
Drosera capensis: Dead, but I don't care
Drosera rotundifolia: Survived
Drosera intermedia: Survived
Darlingtonia californica: Dead, but was young and and I planted it very late in the summer
Utricularia livida: Dead, but I don't care
Utricularia intermedia: Survived
Pinguicula vulgaris: Survived and made lots of «gemmae»
Pinguicula grandiflora: Survived and made lots of «gemmae»
Sarracenia leucophylla: Survived, not a scratch
Sarracenia oreophylla: Survived, and already started to growth
Sarracenia pistacina: Dead, but was young and and I planted it very late in the summer
Sarracenia judith hindle: Survived
I also added lots of Sarracenia purpurea.