Connecticut Ground Snow Load by County and Town

Connecticut publishes its own table of ground snow loads, Appendix P Municipality-Specific Structural Design Parameters, Amendments to the 2021 International Building Code, through Office of the State Building Inspector, Connecticut Department of Administrative Services. twelve of its published figures are set out below with the row each was read from. Only 14 states out of 50 publish anything of their own like it; the other 36 send a reader either to the national code or to a county counter. twelve Connecticut figures, running from 30 psf at Stonington to 40 psf at Colebrook, every one of them quoted from the document it was printed in. Nationally 235 figures were read across 33 states.

Office of the State Building Inspector, Connecticut Department of Administrative Services: the state prints one figure per town and the municipal building official applies it. In its own words: “Pursuant to section 29-252 of the Connecticut General Statutes the following national model codes, as amended herein, are adopted and shall be known as the 2022 Connecticut State Building Code”

The figure is keyed to the county in Connecticut, as it is in 21 states, so the county line rather than the town line is what changes the answer. The published Connecticut figures run from 30 psf to 40 psf.

State of Connecticut, Department of Administrative Services, Office of the State Building Inspector adopts 2022 Connecticut State Building Code (2021 International Building Code and 2021 International Residential Code, as amended). Connecticut amended it rather than adopting it whole, and 22 states have done the same. The adopting rule reads: “Pursuant to section 29-252 of the Connecticut General Statutes the following national model codes, as amended herein, are adopted and shall be known as the 2022 Connecticut State Building Code: 2021 International Building Code 2017 ICC/ANSI A117.1 Accessible and Usable Buildings and Facilities 2021 International Existing Building Code 2021 International Plumbing Code 2021 International Mechanical Code 2021 International Energy Conservation Code 2020 NFPA 70, National Electrical Code, of the National Fire Protection Association Inc. 2021 International Swimming Pool and Spa Code 2021 International Residential Code”

A ground snow load is a weight per unit area and not a depth, and the two are joined only by the density of the snow on the day, which is why the published documents give the load and leave the depth out. Wet spring snow and dry January snow of the same depth are different weights on the same roof. Office of the State Building Inspector, Connecticut Department of Administrative Services works in loads for that reason, and so does every figure set out below.

The Connecticut document itself is the place to look a town up, and what it prints is applied by Office of the State Building Inspector, Connecticut Department of Administrative Services. The document behind it is Appendix P Municipality-Specific Structural Design Parameters, Amendments to the 2021 International Building Code, published by Office of the State Building Inspector, Connecticut Department of Administrative Services, read on September 23, 2026. It establishes the point this way: “(Amd) 1608.2 Ground snow loads. Ground snow loads to be used in determining the design snow loads for roofs shall be as listed in Appendix P.”

14 of 50: Connecticut, Indiana, Maryland, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New Jersey, North Carolina, Rhode Island, Utah, Vermont, Wisconsin. The other 36 split into 17 that adopt the national code without a snow amendment and 19 that leave every figure to a county or city building department. That is the single most useful fact about this subject and no one state's own website carries it.