When the sun threatens to melt all of the food at your picnic, pull out a secret weapon: vinaigrette-dressed potato salads. Not only does vinegar add a punch of bright, zesty flavor, but it also helps salads hold up for hours outside, unlike mayonnaise-based dressing.

Check out four of our favorite vinegary potato salads — including the tarragon-, dill- and parsley-studded herbed potatoes pictured up top — before you pack your next picnic, and be sure to check out our other summer side ideas for pasta and potato salads and more.

Smoky bacon and mustard infuse champagne vinaigrette with punches of flavor. Although Kelsey Nixon's salad is meant to be served warm, it's just as tasty at room temperature.

This colorful salad uses sweet potatoes, pears and beets tossed in an earthy sherry vinaigrette.

Giada De Laurentiis' simple salad takes about 20 minutes to throw together, and uses a hefty dose of lemon juice and zest instead of vinegar to brighten up potatoes.

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