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River Rock and Cobbles


Rock Mountain Products is your King County Garden Center and retail nursery.

Check out our extensive river rock and cobbles product line below:

Belgium Granite Cobbles

Salt & Pepper (Gray)/Black/Pink

Available Sizes:

  • 4x4x4
  • 4x4x8
  • Jumbo 5x9x11

*We stock the 4x4x4 Salt & Pepper (Gray) and can order all colors and sizes from the East Coast.

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Black Granite Cobble

Available Sizing:

  • Fist to head size ~ random shapes

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Lightning Creek Cobbles

Available Sizing:

  • 1"-3" Skippers
  • 6" 'Small Loaf' Ledge Stone
  • 3" - 8" Random Shape and Sizes
  • 5" - 10"
  • Dry Stack

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Montana Blackberry Cobbles

Available Sizes:

  • Cobbles (1/2 - 1 man)

Additional Sizes: Montana Blackberry Landscape Boulders

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Montana Glacier Cobbles

Available Sizes:

  • 4" x 6"
  • 6" x 12"

Additional Sizes: Montana Glacier Boulders

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Montana Rainbow Cobbles

Available Sizing:

  • 3" x 6"
  • 4" x 9" Landscape

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Montana Rustic Cobbles

Quarry has stopped production. Available while supplies last!

Available Sizing:

  • 3" - 6"
  • Jumbo

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Montana Water Feature Lichen Rock

Available Sizes:

  • Water Feature Rock 6" x 12" Cobbles (1/2 - 3/4 man)

Additional Sizes: Montana Lichen Boulders (1- 3 man)

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