Impedance spectra of the frozen electrolyte (CH3)(4)NF . 4H(2)O containing a 1:1 mixture of K3Fe(CN)(6) and K4Fe(CN)(6), placed between gold electrodes, have been measured over a wide temperature range, including above and below the melting point of the electrolyte. For temperatures about 40K below the melting point of (CH3)(4)NF . 4H(2)O, the impedance spectra, obtained in the frequency range from below 10(-2) Hz to over 10(5) Hz, seem to be dominated by charge transport to the electrodes. At these temperatures the interfacial reaction is controlled by the transport of redox active ions both in liquid and frozen electrolytes. However, at temperatures not far below the electrolyte melting point, the low frequency part of the spectra contains a contribution from restricted diffusion. A simplified model of the studied interface, with the segregation of redox active ions from bulk frozen electrolyte into the thin layer near the electrode surface and pores in the bulk electrolyte, is proposed.