  We report limits on annual modulation of the low-energy event rate from the
Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground
Laboratory. Such a modulation could be produced by interactions from Weakly
Interacting Massive Particles (WIMPs) with masses ~10 GeV/c^2. We find no
evidence for annual modulation in the event rate of veto-anticoincident
single-detector interactions consistent with nuclear recoils, and constrain the
magnitude of any modulation to <0.06 event [keVnr kg day]^-1 in the 5-11.9
keVnr energy range at the 99% confidence level. These results disfavor an
explanation for the reported modulation in the 1.2-3.2 keVee energy range in
CoGeNT in terms of nuclear recoils resulting from elastic scattering of WIMPs
at >98% confidence. For events consistent with electron recoils, no significant
modulation is observed for either single- or multiple-detector interactions in
the 3.0-7.4 keVee range.
