Dearborn County, IN Roof Snow Load - 20 psf
What ASCE 7 says about snow load in Dearborn County
That's Dearborn County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. 14 psf is what the ground-load formula alone gives; Dearborn County's 20 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.
Converted to something you can actually eyeball on a roof: about 44 in. of fresh powder, 16 in. once it settles and packs down, or just 4 in. if it's turned to ice. This is a meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Already snow on the roof in Dearborn County?
Dearborn County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#732 of 2,758
- Indiana rank#21 of 89
- Population51,435
- Annual snowfall, NOAA normal15.9 in.
- FIPS18029
Where Dearborn County's figure sits nationally
Out of 2,758 rated US counties, Dearborn County sits at #732, the top 27% nationally - #21 of 89 within Indiana. 19.3 psf is Indiana's typical county figure - Dearborn County beats it by 0.7 psf.
Near 39.1409°N 84.9759°W, FIPS 18029: Dearborn County counts 51,435 residents and a 20 psf map value, which the code's own factors turn into 20 psf.
How much it actually snows in Dearborn County
Most winters bring Dearborn County roughly 15.9 in. of snow - NOAA's normal at FARMERS RETREAT, IN US, 13.3 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Dearborn County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Dearborn County's county-wide figure. See the methodology guide.