Long-lasting Color

I love summer. Fresh lemonade, barefoot walks through the grass, long days at the beach...summer is definitely my favorite season.
There are only two problems I have with summer.
One is bugs.
The other is how fast hair dye fades.

This was my hair at the start of the summer:

A periwinkle color I got using diluted Special Effects Wildflower

 Aaaand here's my hair after two days spent at the beach:

Couple days in the sun and my hair's already bleached near-white

The bright summer sun can be brutal.

So what can you do to prevent your hair from fading so quickly? Here are several tips for long-lasting color!