Snow Load in Montana

56 counties — Average 23.9 PSF (Moderate)

Light (19.6%) Moderate (37.5%) Case Study (42.9%)

Light — 11 counties with 1–20 PSF. Standard roof construction is typically sufficient.

Moderate — 21 counties with 21–40 PSF. Roofs need reinforced framing to handle regular snow buildup.

Case Study — 24 counties where snow loads vary too much to assign one number. A licensed engineer must determine the load for your specific site.

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

Montana Snow Load Map

Counties colored by snow load classification.

Montana

Source: ASCE 7-22 ground snow load data

What is the snow load in Montana?

Montana has an average ground snow load of 23.9 PSF, classified as moderate. Out of 56 counties: 11 light, 21 moderate, 24 case study.

Which Montana counties have the highest snow load?

24 counties require a site-specific case study. See the county table above for a complete breakdown.

How do I check snow load for my Montana 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.

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