​Q. In places where the netz hachama (sunrise) is very late, may one daven shacharis at alos (dawn – or even earlier) on a consistent basis? How much before neitz is considered alos?
A. (See question 2898 above regarding the recitation of Korbanos at night). Shulchan Aruch (89: 8) rules that in time of need one may daven after alos, but one should wait until the stipulated time for reading the Shema has come.
You must also consult daily the zemanin charts widely available on line, to assert that the proper times for putting on the taalis and the tefilin, as well as the reading the shema have come.
Depending on your location, there may also be some shuls available that maintain a before neitz minyan during winter times. They can be found on line.
Horav Shlomo Miller’s Shlit’a opinion is that in need you may also relay on the early Alos Hashachar stipulated on the charts. See next question regarding Pesukei Dezimra before alos.
Rabbi A. Bartfeld as advised By Horav Shlomo Miller and Horav Aharon Miller Shlit’a