The slender-snouted crocodiles breeding season takes place at the start of the rainy season in January and February and lasts until July.
Slender-snouted crocodiles are considered to be sexually mature when they reach 2.0 to 2.5 meters in length, typically at 10-15 years.
Reproduction generally takes place at the start of the rainy season, oogenesis in females and spermatogenesis in males beginning in January and February. Copulation generally occurs soon after. After copulation, the embryo and its surrounding eggshell begin to develop. Two to three months later, around April, egg-laying occurs. The entire process lasts until July.