Magnetocaloric materials are a promising subset of magnetic materials with applications in high-efficiency magnetic refrigeration systems and waste heat recovery. These materials undergo a magnetic phase transition at their magnetic ordering temperature, Tc, resulting in a temperature change. Performance is often represented by the magnetic entropy change upon magnetization, ∆S_M. Density functional theory (DFT) calculations have identified several existing compounds that may exhibit large ∆S_M, including the spinels CoCr₂O₄ and MnCr₂O₄. We synthesized several compounds of the solid solution between these end members, Co_1–xMn_xCr₂O₄, to explore how the Co:Mn ratio allows us to fine-tune the magnetic and magnetocaloric properties of the material. We used high-temperature solid-state synthesis methods and characterized each sample using X-ray fluorescence spectrometry to measure elemental composition, and powder X-ray diffraction to determine crystal structure. An MPMS3 equipped with a vibrating sample magnetometer measured the magnetization of each sample at a range of temperatures and applied magnetic fields to determine its magnetic properties. We found ∆S_M to increase with Mn substitution from approximately –1 J kg^–1 K^–1 for the CoCr₂O₄ to –5.5 J kg^–1 K^–1 for the MnCr₂O₄. Tc ranged from approximately 100 K to 45 K for the CoCr₂O₄ and the MnCr₂O₄, respectively. We hope to collect neutron diffraction data to better understand site disorder within the crystal structure of these spinels. Because of the variable properties of Co_1–xMn_xCr₂O₄ with different Co:Mn ratios, this system has promise as an effective magnetocaloric material for use at a range of operating temperatures.