Pea Gravel

Pea gravel is naturally rounded stone, typically sourced from river beds, stream deposits, or glacial outwash, then screened to a consistent size range of about 1/8 to 3/8 inch. That screening is what separates it from crushed stone, which is mechanically fractured and angular. Because the rounding happens through natural water and weathering, pea gravel comes out variegated rather than a single uniform color, usually a blend of tan, brown, gray, white, and rust tones pulled from the same source material. The 3/8 inch size point matters for buyers because anything larger starts moving into river rock territory, which behaves and looks different underfoot. Suppliers grade the material by screening it through mesh sizes to keep the diameter range tight, since a batch with too much size variation will settle unevenly and drain less predictably. When you're comparing bags or bulk loads, ask about the size range and color mix, since both vary by source region and neither is standardized nationally.

Pea gravel performs best when it sits on a prepared base rather than directly on soil. For paths and patios, excavate to account for depth plus base material, add 4 to 6 inches of compacted crushed aggregate as a firm foundation, then lay landscape fabric to block weeds and slow soil intermixing. Install edging first, metal, plastic, paver, or timber, since pea gravel has no ability to lock together and will migrate past any unedged boundary within a season. Spread the pea gravel in the recommended depth, 2 to 3 inches for paths, 3 to 4 for patios, and rake it level rather than compacting it, since compaction equipment does little on rounded stone. Driveways need a deeper base, 6 or more inches of compacted aggregate, plus 4 inches of pea gravel and sturdy edging, and still expect periodic regrading as tires push material around. Plan on raking and topping up all applications occasionally, since surface loosening is inherent to the material, not a sign of a bad install.

Compared with crushed stone. Crushed stone has angular faces that lock together and compact into a firm, stable surface, which makes it the better call for driveways and heavy traffic. Pea gravel's rounded stones never lock up the same way, so it stays loose and mobile, better suited to drainage, paths, and casual patios than load-bearing surfaces.

Compared with river rock. River rock is the same rounded family of stone but larger, generally 3/4 inch and up, and it's used more for decorative accents, swales, and erosion control than for walking surfaces. Pea gravel's smaller 1/8 to 3/8 inch size makes it more comfortable underfoot and the better pick for paths and patios.

How much pea gravel do I need. Measure length times width times depth in feet, divide by 27 to get cubic yards, then use coverage rates to double check: one cubic yard covers roughly 100 to 110 square feet at 3 inches, or about 80 square feet at 4 inches. Multiply cubic yards by 1.3 to 1.5 tons to estimate weight if you're ordering by the ton. Add 10 to 15 percent extra to cover settling and displacement over the first season.

How pea gravel is sold and delivered. Bulk pea gravel is typically sold by the cubic yard or by the ton, with bulk yardage the more economical route for anything beyond a small bed or container project. Bagged material works for tiny top-ups but costs more per unit. When ordering bulk delivery, have a clear, accessible dump spot ready, since a full load is heavy and difficult to relocate once it's on the ground.