This study investigates the seasonal variations in species richness and abundance of the Chrysomelidae family in the Jhunjhunu district over two consecutive years (January 2021–December 2022). The data revealed a pronounced seasonal pattern, with the rainy season exhibiting the highest species richness and abundance, comprising 25 species and accounting for 84.30% of the total abundance. In contrast, the summer and winter seasons showed markedly lower values, with 9 species and 13.11% abundance in summer, and 7 species and 2.57% in winter. This trend was consistent across both years of the study, highlighting the rainy season as the peak period for Chrysomelidae activity. Diversity indices further corroborated these findings. The rainy season recorded the highest Shannon’s diversity index (HX = 2.798), Margalef’s richness (Mx = 3.262), and Pielou’s evenness (Jx = 0.869), indicating a more diverse and evenly distributed community. Conversely, the winter season exhibited lower diversity and higher dominance, suggesting a less stable community structure during this period.