Neutrino-nucleon total cross sections for neutrino energies up to ultrahigh energies (UHE), E_v=10~(12) GeV, are evaluated within the framework of the dynamical (radiative) parton model. The expected uncertainties of these predictions do not exceed the level of about 250% at the highest energies where contributions of parton distributions in the yet ummeasured region around x approx= 10~(-8) to 10~(-9) are non-negligible. This is far more accurate than estimated uncertainties of about 2~(+-1) due to fixed power law extrapolations of parton distributions to x<10~(-5) required for calculating UHE cosmic neutrino event rates.
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