Diesel – Cold problem

Hello municipality, my Mazda6 120hp made on 5.2. at -17degree problems (stuttering). During the night on Monday were then -23 degrees. (on the highway to Munich stood tens of cars on the right side, all brands) Since that stands the Mazda. When can you make the first start attempts? It should probably stay still 2 weeks in the minus area. Tips on the Internet tell “at 20 degrees he is thawing again”. That would then be in May. Does anyone have experience with it? Thank you Rol