There is something wonderfully refreshing about a simple salad made with crisp cucumbers, juicy tomatoes, and thinly sliced onions. This Marinated Cucumber, Tomato and Onion Salad takes those everyday vegetables and turns them into a bright, flavorful side dish with a tangy homemade dressing.

The secret is in the marinating time. Instead of simply tossing the vegetables with dressing and serving immediately, the salad is allowed to rest so the vinegar-based marinade can soak into every bite. The cucumbers remain pleasantly crisp, the tomatoes add natural sweetness and juiciness, and the onions develop a milder, slightly pickled flavor.

And the color!! Bright green cucumber slices, ruby-red tomatoes, and ribbons of onion make this one of those side dishes that looks every bit as fresh as it tastes.

It is exactly the kind of recipe I love keeping in my back pocket for warm afternoons, cookouts, potlucks, family dinners, and those nights when dinner needs something cool and crunchy on the side.

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What Is Marinated Cucumber, Tomato and Onion Salad?

Marinated cucumber, tomato and onion salad is a simple chilled vegetable salad made by soaking fresh vegetables in a light vinegar-based dressing.

Unlike creamy cucumber salads, this version is crisp, tangy, juicy, and wonderfully refreshing.

The marinade usually combines vinegar, oil, a little sweetness, salt, pepper, and herbs. As the vegetables rest, they release some of their natural juices into the dressing, creating an incredibly flavorful liquid at the bottom of the bowl.

Do not leave that marinade behind—it is one of the best parts!

Why You’ll Love This Cucumber Tomato Onion Salad

There are so many reasons this recipe earns a permanent place in my summer rotation.

It requires very little prep, uses inexpensive ingredients, and tastes even better after sitting in the refrigerator.

It is also naturally colorful enough to brighten up just about any dinner table.

Best of all, you can prepare it ahead of time.

That means fewer last-minute dishes when guests arrive!

Fresh and Refreshing

Everything about this salad tastes crisp and bright.

It is especially wonderful during tomato and cucumber season when the vegetables are at their sweetest and juiciest.

Easy to Prepare

Slice, whisk, toss, chill.

That is really all there is to it.

Perfect for Making Ahead

The salad actually benefits from having time in the refrigerator, making it ideal for potlucks, picnics, barbecues, and meal prep.

No Cooking Required

When it is too hot to turn on the oven, recipes like this are a gift.

What Does Marinated Cucumber Salad Taste Like?

The flavor is bright, tangy, slightly sweet, and wonderfully savory.

The vinegar gives the salad its signature sharpness while a small amount of sugar rounds everything out.

The cucumbers stay cool and crunchy, while the tomatoes release just enough juice to mingle with the marinade.

Then there are the onions.

After sitting in the dressing, their raw bite softens considerably. They become almost lightly pickled, which makes them much more pleasant than simply tossing raw onion into a salad at the last minute.

Fresh herbs finish everything off with an extra burst of summer flavor.