SnowLoadCheck

Audubon County, IA Roof Snow Load - 20 psf

What ASCE 7 says about snow load in Audubon County

Moderate
20 psf

That's Audubon County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. 17.5 psf is what the ground-load formula alone gives; Audubon 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. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.

Snow on Audubon County's roofs right now?

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Audubon County in numbers

Where Audubon County's figure sits nationally

Out of 2,758 rated US counties, Audubon County sits at #1,207, the top 44% nationally - #97 of 99 within Iowa. That's 1.7 psf below Iowa's own county-average design load of 21.7 psf.

Near 41.6792°N 94.9043°W, FIPS 19009: Audubon County counts 5,562 residents and a 25 psf map value, which the code's own factors turn into 20 psf.

How much it actually snows in Audubon County

Most winters bring Audubon County roughly 30.5 in. of snow - NOAA's normal at HARLAN, IA US, 22.3 mi off. (fresh vs. packed vs. ice explains why.)

Read this before you rely on it

Audubon 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 Audubon County's county-wide figure. (How this figure is calculated.)