Arbikal,
There is a website that shows you earnings report date for just about all of NYSE, Nasdaq, and some of AMEX companies. Check out
Briefings Publishing Group. And yes, volatile does increase ahead of earnings. Through
YK Investment - YK Investments, LLC, (their earning service), I've learned that stocks need a 10% move for a 100% gain in options if the IV is at 50%. If the IV for the option is at 75%, then a 10% move for a stock will only create a 50-75% gain on the options. Here's one important thing to look out for: If the stock moves marginally (0-3%), then those options are almost always losers, sometimes worthless. What I've learn is that play the options at 50% IV or less. Good luck to you