As temperatures drop, redheads should cool down their color, too. Nawrot and Potempa agree that the ideal red this fall is a "velvety" bordeaux with a violet undertone. "Take inspiration from nature, and look to the changing colors of the trees," says Potempa. "A rich, bright red hue [gives] the feeling of fall leaves."

If your red hair comes from a bottle, get a soft bordeaux effect by asking your stylist to add a touch of violet to your usual hair color formulation. Redheads can also get the look at home. "Choose a dark violet-pigmented shampoo, and use one to two times a week, allowing the shampoo to stay on the hair for 15 minutes," says Nawrot. You'll get a "sheer," "jewel-like" finish.

Potempa points to Brie Larson's cool auburn as a hair color to copy.

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"Bryce Dallas Howard does my perfect fall red -- so warm and rich," says Cunningham. "A pop of chestnut in the hair creates a smoldering red that really radiates into the fall and winter season."

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Fall hair color means drama -- and what's more dramatic than superheroine-esque, blue-black hair?

"There's nothing prettier or more on-point for the season than raven, blue-black color," says Nawrot. All you have to do to achieve this hue is add, well, blue. Depending on how warm your current hair color is, you can cool it down with blue-tinged color-enhancing products, or get your hair professionally toned or colored.

Once your color is on-point, keep it looking shiny and multidimensional with gloss treatments. "Clear gloss will bring back a lot of the shine you may have lost in summer," says Chaplin.

Rihanna has worn seemingly every hair color on the spectrum, but in this cool black, she looks prettier and more polished than ever.

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