Snow Load in Illinois

102 counties — Average 20.1 PSF (Moderate)

86
16
Light (84.3%) Moderate (15.7%)
Light — 86 counties with 1–20 PSF. Standard roof construction is typically sufficient.
Moderate — 16 counties with 21–40 PSF. Roofs need reinforced framing to handle regular snow buildup.

Based on ASCE 7-22, the national standard for structural snow loads used by engineers and building codes across the US.

Illinois Snow Load Map

Counties colored by snow load classification.

Illinois

Check Your ZIP Code

All 102 Counties — By Snow Load

CountyClassificationSnow Load
Adams Light 20 PSF
Alexander Light 15 PSF
Bond Light 20 PSF
Boone Moderate 25 PSF
Brown Light 20 PSF
Bureau Light 20 PSF
Calhoun Light 20 PSF
Carroll Moderate 25 PSF
Cass Light 20 PSF
Champaign Light 20 PSF
Christian Light 20 PSF
Clark Light 20 PSF
Clay Light 20 PSF
Clinton Light 20 PSF
Coles Light 20 PSF
Cook Moderate 25 PSF
Crawford Light 20 PSF
Cumberland Light 20 PSF
De Witt Light 20 PSF
DeKalb Moderate 25 PSF
Douglas Light 20 PSF
DuPage Moderate 25 PSF
Edgar Light 20 PSF
Edwards Light 20 PSF
Effingham Light 20 PSF
Fayette Light 20 PSF
Ford Light 20 PSF
Franklin Light 15 PSF
Fulton Light 20 PSF
Gallatin Light 15 PSF
Greene Light 20 PSF
Grundy Light 20 PSF
Hamilton Light 15 PSF
Hancock Light 20 PSF
Hardin Light 15 PSF
Henderson Light 20 PSF
Henry Light 20 PSF
Iroquois Light 20 PSF
Jackson Light 15 PSF
Jasper Light 20 PSF
Jefferson Light 15 PSF
Jersey Light 20 PSF
Jo Daviess Moderate 30 PSF
Johnson Light 15 PSF
Kane Moderate 25 PSF
Kankakee Light 20 PSF
Kendall Moderate 25 PSF
Knox Light 20 PSF
LaSalle Light 20 PSF
Lake Moderate 25 PSF
Lawrence Light 20 PSF
Lee Moderate 25 PSF
Livingston Light 20 PSF
Logan Light 20 PSF
Macon Light 20 PSF
Macoupin Light 20 PSF
Madison Light 20 PSF
Marion Light 20 PSF
Marshall Light 20 PSF
Mason Light 20 PSF
Massac Light 15 PSF
McDonough Light 20 PSF
McHenry Moderate 25 PSF
McLean Light 20 PSF
Menard Light 20 PSF
Mercer Light 20 PSF
Monroe Light 20 PSF
Montgomery Light 20 PSF
Morgan Light 20 PSF
Moultrie Light 20 PSF
Ogle Moderate 25 PSF
Peoria Light 20 PSF
Perry Light 20 PSF
Piatt Light 20 PSF
Pike Light 20 PSF
Pope Light 15 PSF
Pulaski Light 15 PSF
Putnam Light 20 PSF
Randolph Light 20 PSF
Richland Light 20 PSF
Rock Island Light 20 PSF
Saline Light 15 PSF
Sangamon Light 20 PSF
Schuyler Light 20 PSF
Scott Light 20 PSF
Shelby Light 20 PSF
St. Clair Light 20 PSF
Stark Light 20 PSF
Stephenson Moderate 25 PSF
Tazewell Light 20 PSF
Union Light 15 PSF
Vermilion Light 20 PSF
Wabash Light 20 PSF
Warren Light 20 PSF
Washington Light 20 PSF
Wayne Light 20 PSF
White Light 15 PSF
Whiteside Moderate 25 PSF
Will Moderate 25 PSF
Williamson Light 15 PSF
Winnebago Moderate 25 PSF
Woodford Light 20 PSF

Source: ASCE 7-22 ground snow load data

Frequently Asked Questions

What is the snow load in Illinois?

Illinois has an average ground snow load of 20.1 PSF, classified as moderate. Out of 102 counties: 86 light, 16 moderate.

Which Illinois counties have the highest snow load?

See the county table above for a complete breakdown.

How do I check snow load for my Illinois address?

Enter your ZIP code in the search box above to see your area's ASCE 7-22 ground snow load, classification, and roof snow load calculator.

Explore All States
AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict Of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming