One Color For Each Season
You need one color that is significant for each season. This is not saying that you only need to wear one color per season, but rather, you need a statement color that purely matches your feeling for that time of year.
Spring: This season is customarily filled with pastels, but be sure to pick a unique shade that will have your friends impressed. A lavendar, powder blue, or even mint green will be a bigger surprise than pastel pink.
Summer: Choose a bold and hot color that looks great with your swimsuit, and stands out against your best pair of sandals. Melon pink, tangerine, or even lemon yellow will look fantastic against your summery outfit.
Autumn: Fall is a unique time of year, so choose a color that you couldn't rock earlier in the year. A mossy green or deep chocolate brown will match the scenery, and your best muted colors.
Winter: Maroon, scarlet, and sapphire shades for winter will never go out of style. These jubilant colors will match the mood of the season, and will go great at holiday parties and walking around town.

Three Neutrals
Neutral colors can be worn almost any time of year if you plan things right.
Black or White: Choose your favorite of these two, depending on your skin tone, and get it! Black looks great for dramatic evening looks, as well as for holidays like Halloween and theme parties. White works well for Spring, Summer, and holidays, too.
Grey: This polish color is timeless, and works for year-round color if you pick the right shade. Try choosing a lighter grey if you plan to use it year round, but dark grey works great for Fall and Winter.
A Muted Color: Muted nail polishes such as mauve and sage go great with many different outfits for a large portion of the year. Add one of these as a flexible polish to your collection.

Base Coat and Top Coat
Yes, it takes longer to apply a base coat underneath your color, and a top coat over it. But the truth is, your polish will go on smoother and will stay put longer if you put in this initial extra effort. Make sure your collection has a quality top and base coat, and you will rock these two polishes all year long.