We get some crazy winds here in Colorado and you want your flagpole to stand up to the strongest wind.
There are many grades of flagpoles. These grades are determined by the base diameter of the flagpole plus the wall thickness of the flagpole shaft to determine a wind rating. Typically a wind rating of 90 MPH is more than sufficient in the State of Colorado.
A perfect example is a 25′ flagpole. Here are 6 examples and the wind rating ranges from 250 MPH to 89 MPH (without a flag).
25′ Flagpole, 6″ base diameter, .188 wall thickness :: Wind rated NO flag: 250 MPH :: Wind rated with flag: 120+ MPH
25′ Flagpole, 5″ base diameter, .156 wall thickness :: Wind rated NO flag: 183 MPH :: Wind rated with flag: 120 MPH
25′ Flagpole, 5″ base diameter, .125 wall thickness :: Wind rated NO flag: 137 MPH :: Wind rated with flag: 105 MPH
25′ Flagpole, 4″ base diameter, .125 wall thickness :: Wind rated NO flag: 113 MPH :: Wind rated with flag: 88 MPH
25′ Flagpole, 3.5″ base diameter, .125 wall thickness :: Wind rated NO flag: 95 MPH :: Wind rated with flag: 77 MPH
25′ Flagpole, 3″ base diameter, .125 wall thickness :: Wind rated NO flag: 89 MPH :: Wind rated with flag: 50 MPH
Many have the discipline to take down their flag on high wind days and can use a flagpole with a lower wind rating.
