SnowLoadCheck

Twin Falls County, ID Roof Snow Load - 10 psf

What ASCE 7 says about snow load in Twin Falls County

Light
10 psf

That's Twin Falls 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 Twin Falls County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.

Converted to something you can actually eyeball on a roof: about 22 in. of fresh powder, 8 in. once it settles and packs down, or just 2 in. if it's turned to ice. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.

Twin Falls County, ID: quick facts

Where Twin Falls County's figure sits nationally

Out of 2,758 rated US counties, Twin Falls County sits at #1,721, the top 62% nationally - #5 of 9 within Idaho. 12.2 psf is Idaho's typical county figure - Twin Falls County comes in 2.2 psf under it.

Near 42.3523°N 114.6656°W, FIPS 16083: Twin Falls County counts 96,509 residents and a 10 psf map value, which the code's own factors turn into 10 psf.

How much it actually snows in Twin Falls County

Most winters bring Twin Falls County roughly 24.2 in. of snow - NOAA's normal at TWIN FALLS 6 E, ID US, 21.1 mi off. (fresh vs. packed vs. ice explains why.)

Read this before you rely on it

Twin Falls 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 Twin Falls County's county-wide figure. Details: the calculation guide.