SnowLoadCheck

Jerome County, ID Roof Snow Load - 10 psf

Jerome County, ID: your roof's ASCE 7 snow number, in plain English

Light
10 psf

Jerome County's roofs are built to hold 10 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. 7 psf is what the ground-load formula alone gives; Jerome County's 10 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.

In depth, not weight: that's roughly 22 inches of fresh, light snow, 8 inches of old, settled snow, or as little as 2 inches of solid ice - snow that heavy is rare here but ice from a freeze-thaw cycle adds up far faster than the depth suggests. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.

Jerome County at a glance

Jerome County by the numbers

Nationally that's #1,871 out of 2,758 rated counties, the top 68%; within Idaho alone, Jerome County ranks #6 of 9. Idaho counties average 12.2 psf; Jerome County runs 2.2 psf lower than that.

Jerome County, FIPS 16053, is home to 26,056 people near 42.6914°N 114.2621°W. Its 10 psf ground snow load figure is the map value; 10 psf is what a roof is actually designed for.

Jerome County's snowfall, most winters

24.2 in. a year: that's Jerome County's NOAA 1991-2020 snowfall normal, measured at TWIN FALLS 6 E, ID US (10.9 mi away). See the density guide.

Before you rely on Jerome County's number

Treat the Jerome County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.

For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. (How this figure is calculated.)