  In this work we address the question of how well the chiral crossover
transition can be understood in terms of a noninteracting hadron resonance gas
model. Using the latest results on the variation of hadron masses as a function
of the pion mass from lattice quantum chromodynamics, we study the temperature
dependence of the renormalized chiral condensate in 2+1 flavor QCD.
Furthermore, we suggest a better criterion to estimate of the pseudocritical
temperature, which gives $T_c = 161.2 \pm 1.7$ MeV, which is much improved
compared to all the earlier results within the hadron resonance gas model or
chiral perturbation theory. For the curvature of the pseudocritical line we
find $\kappa_2 = 0.0203(7)$, which is in very good agreement with continuum
extrapolated lattice results.
