Keep it bright and light, says Nicola Clarke, creative color director for John Frieda. Think sun-kissed. If you're heading into the salon, ask for balayage highlights—a technique in which color just a shade or two lighter than the base is painted onto strands—around the face.
Tip: Since summer is all about lightening up, it is a great time to add highlights, says Doug Macintosh, color director at Sahag Workshop. When trying at home, the trickiest part is knowing where to put the streaks. If possible, get a friend to help you.
Tip: Wearing a hat outside (tightly woven, preferably) is the best way to protect color. But if you'd rather not cover up, apply a few drops of one of three types of oil—argan, vitamin E, or baby—to hair to prevent fading, suggests Sharon Dorram, cofounder of Sharon Dorram Color at Sally Hershberger.
Top, Boden. Earrings, Viv & Ingrid.