  We report experimental observation of the reentrant integer quantum Hall
effect in graphene, appearing in the N$=$2 Landau level. Similar to
high-mobility GaAs/AlGaAs heterostructures, the effect is due to a competition
between incompressible fractional quantum Hall states, and electron solid
phases. The tunability of graphene allows us to measure the $B$-$T$ phase
diagram of the electron-solid phase. The hierarchy of reentrant states suggest
spin and valley degrees of freedom play a role in determining the ground state
energy. We find that the melting temperature scales with magnetic field, and
construct a phase diagram of the electron liquid-solid transition.
