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If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.

There are a few different landscaping projects that can help reduce landscaping costs overall. For one, you can plant everything from seed and watch your yard grow rather than purchasing plants. You can also repurpose old materials from other home projects and do the bulk of your landscaping by yourself instead of hiring a professional to cut down labor costs.

Most experts recommend a quarter-inch layer of compost for best results, and you will need about .77 cubic yards of material per 1,000 square feet. To measure how much compost to use, take the square footage of your yard and multiply it by .77, then divide that number by 1,000.