We determined the homogeneous nucleation temperature depression, Δ T f,hom, the equilibrium melting point depression, Δ T m, and the value λ, which can be obtained from the linear relationship Δ T f,hom = λΔ T m, for aqueous solutions of PEG (200–20,000 g mol −1), PVP (10,000, 35,000, 40,000 g mol −1), and dextran (10,000 g mol −1) in the concentration range 0–40 wt% using the emulsion method. The molecular weight dependence of T f,hom, T m, and λ in PEG aqueous solutions was found to change in the vicinity of Mw 600–1540 at all concentrations. In addition, it was confirmed that for all of the polymers studied, there was a good linear relationship between λ and the logarithmic value of the self-diffusion coefficient D 0 of the solute molecule. These results indicate that the parameters that describe non-equilibrium freezing, such as T f,hom and λ, are dependent on solution properties such as viscosity and self-diffusion of solute molecules.