We present a blind comparison of two methods to measure the mean surface magnetic field strength of the classical T Tauri star CI Tau based on Zeeman broadening of sensitive spectral lines. Our approach takes advantage of the greater Zeeman broadening at near-infrared compared to optical wavelengths. We analyze a high signal-to-noise, high spectral resolution spectrum from 1.5 to 2.5 um observed with IGRINS (Immersion GRating INfrared Spectrometer) on the Discovery Channel Telescope. Both stellar parameterization with MoogStokes and modeling with SYNTHMAG yield consistent measurements for the mean magnetic field strength of CI Tau is B of 2.25 kG. This value is typical compared with measurements for other young T Tauri stars and provides a important contribution to the existing sample given the developed planetary system hosted by this young star.