Better than yellow snow but still not recommended for human consumption, pink snow is a fairly common springtime sight in Colorado. It has nothing to do with an explosion at a food coloring factory, as was the case in Buffalo, N.Y., a couple of weeks back.
Our pink snow is alive.
It owes its hue to a certain microscopic algae, Chlamydomonas nivalis, often mixed up with the pollen from whitebark pine. The pink -- also called watermelon -- snow owes its color to a pigment not unlike that found in either flamingos or tomatoes, not to be confused with the red snow caused by dust storms. The top pink snow resource on the Web (complete with some great pics of the stuff from California's High Sierra) is at Wayne's Word.
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The Straight Dope offers an alternative possible cause for the coloration:
Another theory, from an eminently reputable source, "The Cat in The Hat Comes Back" by Dr. Seuss, describes pink snow resulting from a desperate attempt to remove cake frosting from the bathtub, then mother's dress, then the wall, father's shoes, the rug, the bed, and finally leaving the snow all around the house pink. To turn pink snow white again, you need VOOM, carried in the hat of Little Cat Z.