Ida County, IA Roof Snow Load - 21 psf
What ASCE 7 says about snow load in Ida County
That's Ida County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from.
Converted to something you can actually eyeball on a roof: about 46.2 in. of fresh powder, 16.8 in. once it settles and packs down, or just 4.2 in. if it's turned to ice. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Already snow on the roof in Ida County?
Ida County at a glance
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#475 of 2,758
- Iowa rank#42 of 99
- Population6,810
- Annual snowfall, NOAA normal35.3 in.
- FIPS19093
Where Ida County's figure sits nationally
Out of 2,758 rated US counties, Ida County sits at #475, the top 17% nationally - #42 of 99 within Iowa. That's 0.7 psf below Iowa's own county-average design load of 21.7 psf.
Near 42.3919°N 95.5074°W, FIPS 19093: Ida County counts 6,810 residents and a 30 psf map value, which the code's own factors turn into 21 psf.
How much it actually snows in Ida County
Most winters bring Ida County roughly 35.3 in. of snow - NOAA's normal at HOLSTEIN, IA US, 7.1 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Ida 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 Ida County's county-wide figure. See the methodology guide.