· By Drew Whitmore
What Size Flag Is Right for a 20ft Flagpole?
Choosing the Right Flag Size for a 20ft Pole
Choosing the right flag size for your flagpole is about more than aesthetics—it's about honoring the American flag with proper proportions, visibility, and respect.
If you have or are planning to install a 20ft flagpole, here's how to make the right decision.
Before we dive in, keep in mind that your setup may also depend on where you're located and how you plan to install the flagpole.
If you're unsure, our guide on Do I Need a Permit for My Flagpole? can help you get started the right way.
Recommended Flag Sizes for a 20ft Pole
The general recommendation is that the flag length should be 1/4 the height of the pole. For a 20ft flagpole, this means:
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Best flag size: 3'x5'
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Maximum flag size: 4'x6' (for stronger poles and less windy areas)
Flying a flag that’s too large can stress the pole, hardware, and mounting points—especially during high winds.
Undersized flags, on the other hand, may appear visually unbalanced and diminish your display's impact.
Flagpole Strength and Flag Size Go Hand in Hand
If you're using a sectional or telescoping flagpole, always check the manufacturer's wind rating and suggested flag size. Some materials are better suited for heavier loads than others.
Our 24ft American-made flagpole kit, for example, is crafted from high-grade aluminum with reinforced joints. That means you can confidently fly a full-size 4x6 American flag without worrying about performance.
Curious about the history and evolution of flagpoles themselves? Learn more in The History of Flagpoles in the U.S..
Know Your Local Wind Zone
Windy regions require you to be more conservative with your flag size. Even a 3'x5' flag can cause considerable drag if the pole isn’t designed for it.
Check your local wind zone rating and follow the flagpole's wind speed chart. For more on flying in extreme conditions, see Should You Fly the American Flag in Bad Weather?.
Mounting Location Makes a Difference
If you're placing your flagpole near a building, tree line, or fence, a smaller flag may appear larger because of the surrounding scale.
For open front yards or rural properties, a 4'x6' flag on a 20ft pole can make a bold, patriotic statement—but only if your setup can handle it.
Nighttime visibility is also key—see How to Display the Flag at Night Properly for lighting options and positioning tips.
What If You Want to Fly Two Flags?
Planning to fly a second flag like a POW/MIA or state flag? You’ll need to go smaller:
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Top flag: 3'x5'
- Bottom flag: 2'x3'
Avoid overcrowding the halyard. And make sure the top flag—the American flag—is always the most prominent.
Choosing a Pole That Meets Your Needs
Not all 20ft flagpoles are created equal. Many box store options can't withstand the weight and pull of a premium American flag.
That’s why we recommend investing in our 24ft aluminum flagpole kit, which balances strength, appearance, and longevity.
Wondering how to power your display after dark? Our blog on Solar vs. Wired Flagpole Lights explores which lighting solution is best for long-term performance.
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