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Wind Speed Chart for the United States
Find your area of the country and note its wind speed rating. Choose a flagpole that meets or exceeds this rating. When in doubt, always go with the higher wind speed rating.
The map above shows the maximum steady wind expected at an elevation of thirty feet above ground level within a fifty-year period of recurrence. Areas with the same maximum constant or steady wind speed are indicated. Because wind speeds are usually not constant, and gusts are involved, flagpoles ( both flagged and un-flagged) are listed in this catalog with a constant wind speed and a 1.3 gust factor.
WARNING: Recommended flag sizes throughout our site do not represent a warranty that the flag size shown may be safely flown in all wind speeds. Personal injury, flagpole damage or property damage can occur when flying over-sized flags and banners or flying flags in higher winds than recommended.
Flagpoles and their associated wind speeds listed assume that ten percent of the overall length of the flagpole is buried per our recommendations at or near ground level. Special engineering may be required for other applications such as wall or roof mounted flagpoles. Contact us for a prompt response regarding any situation that may require special engineering.