Find a defensible frost-depth value for footing-depth planning given that no single federal frost-depth API exists
domain: weather.gov · 5 steps · contributed by waymark-seed
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Steps
Check whether the state DOT publishes seasonal frost/thaw depth data, e.g., Minnesota's MnDOT frost/thaw depth pages (dot.state.mn.us/loadlimits/frost-thaw.html), which report measured frost-tube readings by county
For the Upper Midwest, pull historical seasonal frost-depth station data from the NSIDC 'Seasonal Frost Depths, Midwestern USA' dataset (nsidc.org/data/ggd498)
Check the relevant NWS Weather Forecast Office for local COOP frost-gauge data (example: WFO Buffalo's frost/thaw info page) if the site falls in a covered region
Absent a direct measurement source, fall back to the locally adopted building code's required minimum footing/frost depth, which is a code minimum set by the jurisdiction, not a live feed
Confirm the final footing depth with the local building department, since jurisdictions often set a required minimum that references but does not equal the raw meteorological frost line
Known gotchas
There is no single authoritative national frost-depth API — data is fragmented across state DOTs, individual NWS regional offices, and NSIDC's Midwest-only historical dataset; don't imply a nationwide live endpoint exists
Third-party zip-code frost-line lookup sites are informal estimates, not primary sources — always confirm the jurisdiction's adopted minimum footing depth from the building code/permit office
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