Geopolymer concrete (GPC) is an alternative to conventional concrete that can be produced using waste materials. Nowadays, self-compacting geopolymer concrete (SCGC) is an emerging research material as it carries both the characteristics of GPC and conventional self-compacting concrete (SCC) which does not need mechanical compaction to raise the concrete density. The curing process of freshly prepared GPC significantly affects the geopolymerisation mechanism, which influences mechanical strength development. The current manuscript contains a detailed study on the effect of various curing conditions such as ambient, heat, and external exposure (summer and winter) on the mechanical and durability characteristics of SCGC. Here, four ground granulated blast furnace slag (GGBFS)-based mixes and four GGBFS-fly ash (FLA)-based mixes were prepared. All eight SCGC mix designs are developed under four constant mix parameters: 12M sodium hydroxide (SH) concentration, the sodium silicate (SS) to SH ratio (i.e. AAS ratio) of 2.5, superplasticizer (SP) dosage of 6%, and extra water (EW) of 24%. The fresh property investigation includes filling ability (FAB), passing ability (PAB), and segregation resistance (SER) tests. The mechanical characteristics include both non-destructive test (NDT) [Ultrasonic pulse velocity (UPV) and rebound hammer (RH)] and destructive test (DT) [compressive strength (CS) and split-tensile strength (STS)]. The durability criteria are assessed through the water absorption test results. The test results confirm that the GGBFS-FLA-based SCGC is observed to be less workable than the GGBFS-based SCGC. Compared to ambient curing, heat curing in GGBFS-FLA-based mixes exhibits higher strength development than the GGBFS-based mixes. Heat curing and winter external exposure curing show the highest and lowest strength development among all curings. Both ambient and heat curing are feasible to resist water absorption in SCGC mixes.