Pretty much the entire month of October as mentioned before you will definitely be able to see Mercury.  And here is the optimal time to look:

“Mercury rises before the Sun all of this month and is surprisingly easy to see from now through Halloween,” Space.com advises. “All you have to do is just look well below and to the left of our three other morning planets and above the eastern horizon during morning twilight, from about 30 to 45 minutes before sunrise for a bright yellowish-orange ‘star’.”

In addition Jupiter, Mars and Venus will align from October 22-29.  So get out your telescope or go to a friend’s house who has one and check out things in more detail!