Blue Ash

Scientific name: Fraxinus quadrangulata

Overview

Blue Ash is a central North American hardwood associated with limestone country, including the Bluegrass region of Kentucky and nearby areas. The species name refers to its distinctly four-angled young twigs. Its common name comes from a dye obtained from the inner bark, rather than from blue-colored lumber.

The wood offers the open grain and practical utility associated with commercial ash. Its pale-to-brown coloring suits indoor millwork and furniture, while its hardness and wear resistance support flooring and other demanding interior applications. A correct species label matters because ash names in the lumber trade often cover more than one tree.

Quick Facts

  • Common Name: Blue Ash
  • Alternate Common Names: Square-Twigged Ash
  • Scientific Name: Fraxinus quadrangulata
  • Region: North American Woods — Central and midwestern United States, with a limited occurrence in southern Ontario
  • Family: Oleaceae
  • Tree Size: Typically about 70 ft (21 m) tall; mature trunks approximately 18–40 in (0.45–1 m) in diameter
  • Average Dried Weight: Approximately 40 lb/ft³ (640 kg/m³)
  • Janka Hardness: Approximately 1,290 lbf (5,740 N); published values vary
  • Color: Beige sapwood with light to medium brown heartwood
  • Grain: Usually straight and visibly patterned
  • Texture: Medium to coarse and ring-porous

Identification Characteristics

Blue Ash wood is ring-porous, with conspicuous large vessels marking the early part of each annual ring. On flatsawn surfaces these bands produce sweeping figures; straighter cuts show more parallel lines. The wood lacks the broad rays that create prominent fleck in quartersawn oak.

A four-angled twig is a useful source-tree clue, but that character disappears after a log becomes lumber. Keep twig, leaf and locality records with a verified sample. Color, weight and growth-ring width alone do not reliably distinguish every North American ash species.

Key identification traits include:

  • Large earlywood pores in distinct growth-ring bands
  • Beige to pale sapwood and browner heartwood
  • Usually straight grain with an open texture
  • Fine rays without conspicuous oak-like fleck
  • Four-angled young twigs on the living tree
  • Opposite, pinnately compound leaves

Working Properties

Blue Ash generally works well with ordinary hand and machine tools and can be used for steam-bent components. Select straight-grained, defect-free stock for bends and parts subject to repeated loading. Test a representative piece before committing scarce or irregularly grained material to a tight curve.

When machining, cut with the grain where possible and leave enough allowance to remove surface damage during final preparation. Large pores can retain sanding dust and finish. Clean them thoroughly, test the finish schedule and decide whether the project calls for visible texture or grain filling.

  • Use sharp cutters for a clean face and edge
  • Inspect reclaimed boards for embedded hardware
  • Choose uninterrupted grain for handles and bending
  • Predrill near ends and narrow edges as needed
  • Prepare glue joints on sound, freshly machined surfaces
  • Allow movement across wide solid-wood panels
  • Test stain absorption on end grain
  • Select flooring by grade and drying quality as well as hardness

Safety Note

Wood dust can irritate the skin, eyes and respiratory tract. Use effective dust extraction, eye protection and suitable respiratory protection when machining or sanding. Inspect salvaged material for embedded metal, cracks and decay before cutting, and assess dead standing trees professionally before removal.

Common Uses

Blue Ash has been used for flooring, millwork, utility containers and turned products such as handles. Its visible growth rings also offer design possibilities for furniture and smaller interior projects where the figure can remain a feature.

Hardness is only one selection factor. Do not infer structural capacity, outdoor durability or suitability for a heavily stressed part from a Janka number alone. Grain direction, defects, moisture content and component dimensions also influence performance.

  • Interior flooring
  • Millwork and trim
  • Furniture components
  • Turned tool handles
  • Boxes and utility crates
  • Bent parts made from suitably selected stock

Sustainability & Notes

Blue Ash shows greater resistance to emerald ash borer than several other native ashes, but it is not immune. Its relative survival should not be taken as assurance that a stand is secure or that unrestricted harvesting is appropriate.

Use traceable timber from authorized sources and preserve locality information with salvage. Avoid moving untreated logs, bark or firewood contrary to local requirements. Protecting living trees and natural regeneration remains important even where usable dead or removed material is available.

Comparative Notes & Related Species

Related Guides

Compare Wood Properties

See how this species ranks in density and hardness using our Wood Density & Janka Hardness Chart. You can also explore Hardest Woods, Softest Woods, and Most Dense Woods for quick comparisons.

Collector Notes

A documented Blue Ash specimen is particularly useful beside White Ash and Green Ash. Include a clean end-grain surface and record the source tree’s four-angled twigs photographically, since wood appearance alone offers limited certainty.

Note the moisture condition when recording sample weight. Published hardness figures for Blue Ash are inconsistent between references; the commonly cited figure on this page is a comparative guide rather than a guaranteed property of an individual board. Keep test methods and references with any measured collection data.

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Wood Sample Collection

This species is part of an ongoing effort to document and preserve wood samples from around the world.

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Resources

Authoritative botanical and forestry references used in compiling information about this species include:

• USDA Forest Service – Wood Handbook: Wood as an Engineering Material
https://www.fpl.fs.usda.gov/products/publications/

• The Wood Database – Global reference for wood identification, physical properties, and woodworking characteristics
https://www.wood-database.com/

• Royal Botanic Gardens, Kew – Plants of the World Online – Botanical taxonomy and species distribution database
https://powo.science.kew.org/

• International Union for Conservation of Nature (IUCN Red List) – Global conservation status assessments
https://www.iucnredlist.org/

• Convention on International Trade in Endangered Species (CITES) – International trade regulations for protected plant species
https://cites.org/

Additional forestry publications, academic research papers, and regional timber studies may also be referenced where available.

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Availability & Where to Buy

Exotic hardwood availability can vary significantly depending on region, sustainability regulations, and supplier inventory.

As this archive grows, recommended suppliers and specialty wood retailers will be listed here to help woodworkers locate responsibly sourced material.

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