What time does the track open? Can you use it at 7am?

Yes

I think that 7am is the correct time it open, but sure.

It should ne open at 7 i have used the track at 630am some mornings

its not always open 24hrs ive tried early morning or around 10pm and it can be closed.

Yes you can walk as early as 7:00AM

I live alone, and sometimes I can't sleep, so I walk up to the park to walk around the football field which they call it the exercise track.

Yes you can

It is open 24 hours