Landfill mined soil-like fraction (LMSF) is the material obtained from mining of old waste. Utilization of LMSF in infrastructure applications is limited due to several challenges including possible presence of organic content, heavy metals, heterogeneous composition, etc., and require stabilization prior to usage. In light of this, LMSF was stabilized with alkali activated slag at different curing temperatures including freeze curing (- 21 degree celsius), ambient curing (25 degree celsius), thermal curing (60 degree celsius) and their combinations. Further, the performance of stabilized LMSF was evaluated on cyclic exposure to different climatic conditions, viz., - 21 degree celsius, 0 degree celsius, 10 degree celsius, 25 degree celsius and 45 degree celsius in both closed (without water exposure) and open system (water inundated) conditions. The performance of stabilized LMSF under these climatic conditions was evaluated through unconfined compressive strength (UCS), indirect tensile strength, cyclic loading tests, and microstructural aspects. Based on initial trials, ambient curing (25 degree celsius) and 2 days thermal curing at 60 degree celsius yielded better performance of stabilized LMSF. The 28 days stabilized LMSF has shown stable performance against cyclic exposure to different climatic conditions by satisfying the maximum allowable mass loss criteria after 12 cycles as per IRC-37, except for exposure to subfreezing temperature of - 21 degree celsius in open system. Further, not much reduction in UCS and indirect tensile (except for - 21 degree celsius in open system) strength was observed on cyclic exposure to different climatic conditions, inferring the stability of cementitious compounds and resistance against degradation. 2 days of thermal curing at 60 degrees C notably enhanced the performance of stabilized LMSF in different exposure conditions under both static and cyclic loading conditions, suggesting it as favourable curing condition for sustainable and low-cost stabilization of LMSF in different climatic conditions ranging from sub-freezing to arid regions.