Zr(Cr1-xFex)2 samples with the C14 structure were prepared in an arc furnace for x = 0.2-0.85. Magnetization, ac susceptibility and Mössbauer spectra were measured in the 4.2-300 K temperature interval. Saturation magnetic moments were obtained from magnetization data and iron moments were obtained from Mössbauer spectra; the Cr moment was found to be negligible. A new environment-dependent model for the formation of Fe moments was proposed. Arrott plots showed that long-range magnetic order only occurs for x > 0.7. Spin glass properties were studied in detail for x ≤ 0.7. Samples with x = 0.8-0.85 were ferromagnetic with a reentrant spin glass transition. A magnetic-phase diagram was drawn for this system.