Use the right products. "Treat hair the way you would your skin," says L'Oréal Paris' Hill. Translation: Use a sulfate-free, color-preserving shampoo and conditioner, and stick with alcohol-free (the label will say) stylers that won't dry hair out.
Shampoo less often. Water is hair color's worst enemy, so on the days you can, skip washing altogether and blast roots with dry shampoo. On the days you can't, use as little shampoo as possible, or better yet, rinse hair with warm water and use just conditioner.
Mask it. Commit to using a deep conditioner once a week to keep hair hydrated and soft. Afterward, let air-dry if possible.
Do a glaze. Think of color-enhancing glosses as a topcoat for your hair—they add shine and deposit a transparent coat of color. Try a lightweight formula like John Frieda Colour Refreshing Gloss ($13, ulta.com) every week.
Protect against UV. Easy: Wear a broad-rimmed hat to prevent the sun from bleaching the color. When you can't, spritz hair with a UV protectant like Bumble and Bumble Surf Infusion ($29, bumbleandbumble.com) 30 minutes before heading out.