  Current mass limits for fourth generation sequential neutrinos come from dark
matter experiments assuming $\rho_{DM}=0.2-0.8$ g/ cm$^3$. We show that the
latest results from the CDMS II experiment exclude Dirac neutrinos with masses
below 500 GeV assuming only that they are produced as expected by the Big Bang
model and clump in the same manner as baryons. We also show the next generation
of nuclear recoil experiments will be sensitive to fourth generation Majorana
nuetrinos. Finally, we consider the case in which the neutrino interacts with
the nucleus via the exchange of a Higgs boson.
