The cement industry is highly polluting, contributing to the emission of toxic gases. Geopolymer mortar, made from materials rich in aluminum and silicon oxides, emerges as a sustainable alternative, with lower energy consumption and CO2 emissions, helping to reduce carbon footprint in construction industry. This study aims to investigate the influence of curing conditions on the properties of geopolymer mortar. Geopolymer mortar was prepared from metakaolin, as precursor, and sodium hydroxide and silicate, as chemical activators. The molar ratios of Na2O/SiO2, SiO2/Al2O3, Na2O/Al2O3 and H2O/Na2O used in the mixture were 0.26, 3.89, 1.03 and 9.02, respectively. The specimens were cured under two conditions and then subjected to compressive strength, at 3, 7 and 28 days, density, porosity and water absorption tests, at 28 days. Half of the geopolymer specimens were cured in the laboratory room, at ambient temperature of 27 ℃ and humidity of 89%, and the rest were cured in an oven, at 60 ℃ for 24 h, followed by curing in the laboratory room until the tests age. The findings revealed that thermal curing led to an increase in 3 and 7-days compressive strength, when compared with specimens cured at ambient temperature. However, specimens cured in ambient temperature (27 ℃) had the highest compressive strength with 41 MPa, at 28 days. In this study, the density, porosity and water absorption of the specimens cured by two methods were similar. This result demonstrates the effectiveness of curing geopolymer mortar at ambient temperature, highlighting its ability to provide better strength to geopolymer mortar at 28 days of curing.