ASCE and IRC Basic Wind Speeds TM


Use our ASCE and IRC Basic Wind Speeds map to easily obtain the basic wind speed (Figure R301.2(4)A of IRC 2012) for any location in the contiguous United States, Puerto Rico and Alaska. You can click on the map below to determine the basic wind speed for that location.

Shaded (Special Wind Region) areas, mountainous terrain, gorges, and ocean promontories should be examined for unusual wind conditions. The local authority, having jurisdiction, should be consulted for adjusted values based on higher local wind speeds. Values interpolated to the nearest 1-mph in high wind areas.
Values are nominal design 3-second gust wind speeds in mph at 33ft above ground for Exposure C category.
 
* Basic wind speeds derived from Figure 26.5-1A of ASCE 7-10. Local codes and ammendments may govern,verify with local building department or jurisdiction.
 

If you need to gather basic wind speed data data programmatically, please consider our API Service.
If you have any questions or concerns about specific wind speeds please call us at 1-425-741-5555.

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