Individual stellar tracks from the SPOTS models. Top row: diagrams of the luminosity (left), surface gravity (center), and radius (right) versus T_eff for our un-spotted models from 0.1 to 1.3 M_⊙. Bottom row: an illustration of the influence of starspots on the a 1 M_⊙ stellar model. From blue to brown, the starspot intensity increases, as indicated by the caption in the center panel. The primary effect of spots is to reduce T_eff and increase the radius by up to ∼15%.