<p>Low-temperature terahertz (THz) spectroscopy provides deep insights into the physical and resonant properties of magnetic materials. Hard ferrimagnets such as cobalt ferrite (CoFe₂O₄) typically exhibit natural ferromagnetic resonances in the sub-THz region, making them highly promising for ultrafast electronics and spintronic applications. In this study, THz time domain spectroscopy was performed on CoFe₂O₄ over the temperature range 40 to 180&#xa0;K in both cooling and heating cycles. A prominent NFMR feature emerges below ~ 180&#xa0;K, with the resonance frequency shifting toward higher values as temperature decreases. The resonance linewidth narrows significantly at lower temperatures and broadens with increasing temperature, indicating enhanced thermally activated magnetic relaxation possibly involving the spin lattice interactions. Minor thermal hysteresis in the resonance frequency between cooling and heating cycles reflects domain wall pinning effects driven by the high magnetocrystalline anisotropy of CoFe₂O₄. These findings demonstrate that CoFe₂O₄ is highly suitable for powerful, field-free spin pumping and related phenomena in the sub-THz and THz regimes, offering strong potential for advanced spintronic devices, high-frequency absorbers, phase shifters, isolators, and ultrafast magnetic control.</p>