Host-parasite relationships play a vital role in shaping ecological and evolutionary processes. Periplaneta americanai.e. American cockroach and Supellalongipalpai.e. brown-banded cockroachare often infected by gregarine parasites. These tiny organisms live in the cockroach’s intestines and can impact its health, behavior, and population. This study looked at how gregarine infections change month by month in P. americanaand S. longipalpa across different areas of Chhatrapati Sambhajinagar district in Maharashtra. A total of 591 P. americanasamples were collected and examined under a microscope. About 55.32% of them were found to be infected. While a total of 308S. longipalpa samples were collected and examined under a microscope. About 32.46% of them were found to be infected. We noticed that infection rate changed with the seasons. Some months showed high parasite levels especially from monsoon and moderate from winter, while others had fewer cases i.e. from summer. This suggests that weather and environmental conditions might play a role in how the parasites spread. These findings give us new insight into how gregarines affect cockroach populations. They could also help improve pest control by using natural parasites as part of an eco-friendly strategy. More research is needed to understand why infections rise and fall with the seasons and how climate change might affect this pattern.