  We consider dynamics of classical dimer models undergoing a phase transition
to an ordered, frozen state. Relaxation processes are dominated by traps which
are entropic in origin and can be traced to the locally jammed nature of the
dimer states. Depending on the nature of the phase transition, critical
dynamics are characterized either by an exponential, or sub-exponential in time
relaxation of the order parameter. In the latter case relaxation time scales
diverge {\em exponentially} as the critical point is approached, following the
Vogel-Fulcher law.
