We report the detection of the CO J = 1-0 emission line in three near-infrared selected star-forming galaxies at z ~ 1.5 with the Very Large Array and the Green Bank Telescope. These observations directly trace the bulk of molecular gas in these galaxies. We find H2 gas masses of 8.3 ± 1.9 × 1010 M sun, 5.6 ± 1.4 × 1010 M sun, and 1.23 ± 0.34 × 1011 M sun for BzK-4171, BzK-21000, and BzK-16000, respectively, assuming a conversion αCO = 3.6 M sun (K km s–1 pc2)–1. We combined our observations with previous CO 2-1 detections of these galaxies to study the properties of their molecular gas. We find brightness temperature ratios between the