  We summarise the analyses that search for fourth generation quarks at the
Central Muon Solenoid (CMS) experiment. Such particles provide a natural
extension to the Standard Model (SM) and are still consistent with precision
electroweak measurements. Our searches are not limited to fourth generation
chiral quarks and are relevant to many Beyond the Standard Model theories. No
excess over the expected SM background is observed in any of these analyses and
limits are set on the masses of the $b^\prime$ and $t^\prime$ quarks at 95%
confidence level at 361 GeV/$c^2$ and 450 GeV/$c^2$, respectively.
