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Acorn's Yellowstone Post Cap has a low-profile demi-top with a tiered-inset base.
As with all Acorn post caps, the Yellowstone is made from a single piece of cedar, Ipe, or pressure-treated pine. This eliminates any joints or glued pieces that can come apart. Additionally, the 3/8 inch inset base protects the post end grain for greater longevity. Choose from post cap sizes 3-5/8 inch or 5-5/8 inch. Acorn Wood Post Caps are ready to be treated with your choice of wood oil.

Note: Post caps must be treated, or cracking/splitting/warping can occur. Wood oil should be used on all surfaces of the cap.

Unsure about your size? Measure your posts carefully and use our Post Cap Diagram to understand critical dimensions and ensure a proper fit.


DecksDirect # 6395

Acorn Post Cap Brochure (227 KB) 

Installation Instructions (102 KB) 

Material TypeIpe, Cedar, and Pressure Treated Pine
Pack SizeEach
Post Cap Opening Size3-5/8 in and 5-5/8 in
(width x depth x height)
3-5/8 in = 5 in x 5 in x 1-1/2 in
5-5/8 in = 7 in x 7 in x 1-1/2 in
Inset Measurement3/8 in
Included AccessoriesNone
WarrantyView Acorn Warranty Information
OtherIpe post caps come pre-treated with Penofin Hardwood Oil

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