Background: Allergic rhinitis (AR) is an IgE-mediated inflammatory condition characterized by Th2-skewed immune responses to allergens. Immune alterations in memory T cells, T follicular helper (Tfh) cells, and regulatory T (Treg) cells may influence baseline immune activity in AR patients even in the absence of allergen exposure, promoting sustained cytokine dysregulation, aberrant Tfh-B cell interactions, and impaired immune regulation. Aim: This study aimed to investigate the role and function of T cell subsets in AR by analyzing PBMCs from AR patients and healthy controls, focusing on immunological differences and their implications. Methods: Peripheral blood mononuclear cells from AR patients and healthy individuals were analyzed via flow cytometry to assess Th1, Th2, Th17, Tregs, and Tfh cells. Results: Off-season shifts in T cell populations were observed in AR patients compared to healthy controls. Memory T-helper (Th) cells in AR patients showed reduced frequencies of Th1/Th17 subsets and CD49d -CD27 + memory Th cells, indicating a skewed T cell profile. T follicular helper (Tfh) cells also displayed an altered distribution: AR patients had decreased Tfh1 and Tfh1/Th17 frequencies, but increased Tfh17 and Tfh2 populations, suggesting enhanced Tfh-driven B cell support. Regulatory T (Treg) cells were similarly dysregulated, with reduced frequencies of Th1/Th17-like CD49d -CD27 + Tregs and CD49d -CD27 - Tregs, reflecting impaired immune regulation. Conclusion: Off-season memory Th cell polarization, Tfh subset skewing, and Treg dysfunction in AR likely prime patients for exaggerated immune responses upon pollen exposure. These immunologic alterations provide a mechanistic link to the heightened Th2 cytokine release and IgE-mediated inflammation that trigger AR symptoms during pollen season.