Massachusetts sets ultimate design wind speed town by town. 780 CMR Tenth Edition Residential, Chapter 3 (Building, Planning Amendments, dated 04/29/2025) replaces IRC Table R301.2 Climatic and Geographic Design Criteria with a new Table R301.2(1) in which "Speed (mph)" is taken from Table R301.2(2), "Topographical effects" is "NO", "Special wind region" is per Table R301.2(2) Note 2, and "Windborne debris zone" is "Any area within a windborne debris region as defined in Chapter 2 of 780 CMR 51.00." Table R301.2(2) SNOW LOADS AND WIND SPEEDS lists an ultimate wind speed for every Massachusetts municipality (Yarmouth 131 mph and Wrentham 122 mph, for example). Note 3 to that table states: "Windborne Debris Region. Specific locations within these municipalities may be within a Windborne Debris Region (with Vult 130 mph or more) as defined in 780 CMR R202.0. See https://asce7hazardtool.online for location specific details for windborne debris regions in ASCE/SEI 7-16, Risk Category II." The amendments also replace R301.2.1.1: "The wind provision of 780 CMR 51.00 shall not apply to the design of buildings where the ultimate design wind speed, Vult equals or exceeds 140 miles per hour (225 kph). See Table 301.2(2) for wind speeds by city or town" - above that threshold the building must be designed by the AWC Wood Frame Construction Manual, ICC 600, ASCE 7, AISI S230 or the International Building Code. Sections R301.2.1.5 and R301.2.1.5.1 (topographic wind effects) and Table R301.2.1.5.1 are deleted. IMPORTANT: this is the Tenth Edition position. The Board’s older Ninth Edition guidance ("Windborne Debris - Impact Resistant Glazing Requirements") concluded that windborne debris protection was NOT triggered anywhere in the Commonwealth because the Ninth Edition definition used nominal speed Vasd; that reasoning does not carry over to the Tenth Edition definition, which is stated in terms of Vult 130 mph or more. Mass.gov marks its posted regulation PDFs "THIS IS AN UNOFFICIAL COPY OF THE REGULATIONS - OFFICIAL COPIES MUST BE OBTAINED FROM THE SECRETARY OF THE COMMONWEALTH." Look your town up in Table R301.2(2) before specifying a garage door’s design pressure.