What is the gearscore minimum for all the raids (including Heroics)?

[ubijac]

I’m new to raiding and I want to know the minimal gs needed for all the raids.

[dolcokidol]

Minimum is whatever the person making the group asks for.
If you're the one making the group minimum is whatever you want it to be, if you feel confident enough you can do ICC at any gearscore, you just need to be level 80.

What seems like a reasonable idea is just to have gear from previous tier before joining the next tier raids. Having at least mostly ulduar 25 / toc10 gear before joining toc25, toc 25 gear before joining icc 25 and so on.