Windsor, CO: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Windsor is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Windsor sits at the 53th percentile for seismic hazard among 4,875 US cities.

Windsor by the numbers

USGS's underlying values for Windsor: 0.087g peak ground acceleration, 0.167g at short period, 0.053g at 1 second. Within Colorado alone, Windsor ranks 68 of 79 cities by seismic hazard - the 14th percentile in-state. Windsor has a population of about 41,734.

What a retrofit costs in Windsor

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Colorado specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Colorado.

What this means for insurance

A Windsor homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Windsor's figures come from

Windsor's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Windsor.