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Sat: 8:30 am - 4:00 pm
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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:

Black Granite Cobble

Available Sizing:

  • Fist to head size ~ random shapes

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Granite Cobbles (Split Edge)

Available Sizes (Salt & Pepper):

    4" x 6" x 2"
    4" x 8" x 2"
    4" x 4" x 4"
    4" x 8" x 4" (also available in Dark Grey Granite

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Granite Cobbles (Tumbled)

Available Sizes (Tumbled Salt & Pepper or Dark Grey):

    4" x 6" x 2"
    4" x 8" x 2"
    4" x 4" x 4"
    4" x 8" x 4"
    4" x 12" x 4"

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Lightning Creek Cobbles

Available Sizing:

  • 1"-3" Skippers
  • 6" 'Loaf' Stone
  • 3" - 5" Random Shape and Sizes
  • 5" - 10"

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Montana Glacier Cobbles

Available Sizes:

  • 4" x 6"
  • 5" x 10"
  • Boulders

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Montana Rainbow Cobbles

Available Sizing:

  • 4" x 9" Landscape

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Montana Rustic Cobbles

Available Sizing:

  • 1" - 3"
  • 3" - 6"
  • Jumbo

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Montana Water Feature Rock

Available Sizes:

  • 6" x 12" Cobbles
  • Landscape Boulders

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Silver Falls Cobble

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