The aim of this research is to investigate the effect of soil burial on physical, mechanical and thermal properties of sugar palm fibre (SPF) reinforced vinyl ester (VE) composites. Neat VE and SPF/VE composites at weight ratio of 10 wt.% SPF were prepared using wet hand lay-up method. The specimens were buried in the soil for 0, 200, 400, 600, 800 and 1000 hours to investigate the effect of soil burial to its physical properties (i.e. water absorption), mechanical properties (i.e. tensile, flexural and impact strength) and thermal properties. Obtained results indicated that, the longer soil burial period led to high water absorption of the composites. After 200 hours of soil burial, the SPF/VE composites water uptake increased 0.92 % compared to neat VE which is 0.42 %. Based on the results, soil burial reduces the mechanical strength of the composites. Tensile, flexural and impact strength decreased rapidly after 200 hours of soil burial compared to neat VE which were 28.24 %, 8.04 % and 14.83 %, respectively. Thermal stability after 200 hours of soil burial increase temperature onset of the SPF composites compared to neat VE. Overall, soil burial increased water absorption, temperature onset of the SPF composites and at the same time decreased the tensile, flexural and impact strength of the composites.