How early do i have to show up to get front row seats to this concert?

Im going to the Kid Cudi concert on July 6 in Brooklyn. I live in Montclair, NJ, and was wondering how early do i have to leave my house to get front row seats? The concert starts at 5:30pm, and mapquest says it takes about 45 minutes to get there (maybe some traffic?) what time would i have to leave to get front row seats, or within like the first 5 rows? Please help.