Yes, you will need to have cow calls and know how to use them. If it were me, I would go the last 7 days.

The best thing you could do right now is go to elknut.com and get his videos on the sounds elk make, why they make them and how to answer back. Well worth the money. No, these are not hunting videos with a little bit of "how to" thrown in. They are 100% how to and why to.