Ogle County, IL Roof Snow Load - 20 psf
What ASCE 7 says about snow load in Ogle County
That's Ogle County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. Flat and low-pitch roofs in Ogle County are actually governed by ASCE 7's §7.3.4 minimum of 20 psf, not the 17.5 psf the ground-load formula alone would produce.
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. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Ogle County at a glance
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map25 psf
- National rank#733 of 2,758
- Illinois rank#26 of 102
- Population51,345
- Annual snowfall, NOAA normal32.3 in.
- FIPS17141
Where Ogle County's figure sits nationally
Out of 2,758 rated US counties, Ogle County sits at #733, the top 27% nationally - #26 of 102 within Illinois. That's 0.7 psf above Illinois's own county-average design load of 19.3 psf.
Near 42.0419°N 89.3202°W, FIPS 17141: Ogle County counts 51,345 residents and a 25 psf map value, which the code's own factors turn into 20 psf.
How much it actually snows in Ogle County
Most winters bring Ogle County roughly 32.3 in. of snow - NOAA's normal at OREGON, IL US, 2.5 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Ogle 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 Ogle County's county-wide figure. See the methodology guide.