When do you consider the end of Classic Rock?

I would say early 90's.

I'd say late 70s, early 80s. I don't consider a lot of 80s songs classic rock and I certainly don't consider 90s music classic rock.

Probably somewhere in the 80's. I don't consider 90's bands like nirvana and red hot chili peppers classic rock. Rock itself is either dying out slowly or evolving into the fake, artificial BS that plays on the radio everyday. :( PS: I like pink Floyd ;)

I'm not sure rock was still there in the 90's and early 2000's but it's becoming less popular. In the ninties there was buckethead, Grahm Coxon (solo) and there was audioslave and the blue dawnsin the 2000's but it's slowly dying as we speak.