What Are The Standard Sizes For Langstroth Frames? A Guide To Deep, Medium, And Shallow Dimensions

Standard Langstroth frames are defined by a uniform top-bar width of 19 3/16 inches, differing only in their vertical depth to fit specific hive boxes. The three industry-standard depths are Deep (9 1/8 inches), Medium (6 1/4 inches), and Shallow (5 3/8 inches).

While all frames share the same top-bar dimension to fit the hive body, the variation in depth dictates the frame's weight and function. Your choice of frame size fundamentally determines the physical manageability of the hive.

Anatomy of Standard Dimensions

The Uniform Top Width

Regardless of the vertical size, every standard Langstroth frame features a top width of 19 3/16 inches. This specific measurement includes the "ears" of the frame, allowing it to rest securely on the rebates of any standard Langstroth box.

The Three Standard Depths

Because the width is constant, the frame "size" is almost always a reference to its depth.

Deep Frames: 9 1/8 inches
Medium Frames: 6 1/4 inches
Shallow Frames: 5 3/8 inches

Non-Standard Variations

While the three sizes above cover the vast majority of hives, you may occasionally encounter "Jumbo" frames (11.2 inches) or "Comb Super" frames (4 1/8 inches). These are niche sizes and are not considered standard for general beekeeping.

Matching Frame Depth to Purpose

Deep Frames for the Brood Nest

Deep frames (9 1/8 inches) are the traditional standard for the brood chamber—the bottom boxes where the queen lays eggs. The large surface area allows the queen to establish a large, uninterrupted laying pattern, which is vital for colony health.

Medium and Shallow Frames for Honey

Medium (6 1/4 inches) and Shallow (5 3/8 inches) frames are primarily used in "honey supers," the upper boxes meant for harvest. Beekeepers generally prefer these smaller sizes for honey storage because they are significantly lighter and easier to lift when full.

Understanding the Trade-offs

The Weight Factor

The most critical trade-off in frame selection is weight. A box filled with Deep frames and honey can weigh upwards of 80 lbs. By contrast, a box filled with Medium frames typically tops out around 60 lbs, significantly reducing strain on the beekeeper's back.

Efficiency vs. Equipment Management

Using Deep frames is more efficient for the bees, as they have more continuous comb space. However, using a mix of frame sizes (Deeps for brood, Mediums for honey) forces you to manage two different inventory stocks. You cannot swap a Deep frame into a Medium box if you run out of equipment.

Making the Right Choice for Your Goal

Whether you are setting up a new hive or expanding an existing one, select your frame sizes based on your physical limits and management style.

If your primary focus is brood health and tradition: Use Deep frames for the bottom two boxes to give the queen maximum laying space.
If your primary focus is ergonomics and lifting safety: Use Medium frames for your honey supers to keep the maximum lifting weight under 60 lbs.
If your primary focus is equipment simplicity: Consider using Medium frames for both brood and honey (the "all-medium" apiary) to ensure every frame fits every box.

Standardization is the key to a manageable apiary; choose the frame depth that you can lift comfortably season after season.

Summary Table:

Frame Type	Depth (Inches)	Top-Bar Width	Primary Purpose	Weight (Full of Honey)
Deep	9 1/8"	19 3/16"	Brood Nest / Queen Laying	~80+ lbs
Medium	6 1/4"	19 3/16"	Honey Supers / Ergonomics	~60 lbs
Shallow	5 3/8"	19 3/16"	Honey Production / Lightweight	~30-40 lbs
Jumbo	11.2"	19 3/16"	Niche / Specialized Brood	Variable

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