Design Data

Washington State Climatic Zone Map and Frost Depth Design Requirements for Selected Counties and Cities

Source - Washington State Energy Code - MIW Survey of Bldg. Officials

Note: climatic Zones* are based on a combination of heating degree days and design-outdoor temperatures; therefore some local deviation may be necessary to reflect actual conditions. The local jurisdiction may authorize an adjacent Zone for application of energy code requirements in areas where local design conditions and degree days justify such a consideration. The adoption of a specific climatic zone shall be designated as part of the Ordinance adopted by the local governing body.

* all areas above 7000 degree days shall comply with Zone V

Click on West or East half for enlarged detail.

Frost depth design requirements are indicated "30" (in inches) on map.

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The NW Masonry Guide Table of Contents

Masonry Institute of Washington
Washington State Conference of Mason Contractors