Whereas in most magnesium applications die casting is the dominant manufacturing process, thixocasting recently came into focus of producers. This is mainly due to the improved microstructure, reduced porosity and better mechanical properties. An important issue for the introduction and use of magnesium alloys in automotive industry is their creep resistance. Aluminum free magnesium alloys are known to show improved creep strength compared to conventional aluminum containing alloys due to the absence of beta phase (Mg ₁₇Al ₁₂). MEZ alloy (Mg-RE-Zn-Zr) shows better creep resistance even compared to AE42 in die casting. In this paper, the mechanical and creep properties from thixocast MEZ alloy are evaluated from creep tensile tests at temperatures of 135°C, 150°C and 175°C and at stresses between 60 and 100 MPa. The creep activation energy and the stress exponent are calculated and discussed. Optical, scanning and transmission electron microscopy of the microstructural features developed after the mechanical tests helps to understand the deformation mechanisms occurring during creep and to explain the creep properties after thixocasting.