When would be the best time to file H1B Extension

Hi,

I am holding H1B and is currently working in the United State. My H1B started from 10/01/2011 and it will expired in 9/30/2014. My question is when would be the best time to file for H1B extension if my employer would like to extend it for me?

Best Regards,

~Jen~

You can file it six months prior to its expiry.