2017 Spring & Summer Hair Color Trend. As the warm season heats things up our hairstyles become just a tad bit hotter! The spring and summer season offers in some major bold hair colors ranging from exotic hues of metallic and split-dye, to more tame variations such as the tiger-eye and balayage. Play up your new hue with a brand new haircut such as the lob or pixie. Whatever you decided to do with your mane remember that the summer season is the ideal time frame to have a little fun with your tresses!