You can pray Fajr as long as the sun has not risen. One should pray is after the Athan which is when the dawn breaks.

Can we still do Fajar prayer from 6:00 am – 7:30 am?

Prayer | March 26, 2014 5:50 pm
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What should I do if I start praying fajr before sunrise and I finish after it due to the fact that there are only 10, 15 minutes in between?