Snow Load in New Hampshire

10 counties — Average 64 PSF (Extreme)

Heavy (30.0%) Extreme (20.0%) Case Study (50.0%)

Heavy — 3 counties with 41–60 PSF. Engineered roof systems required for significant snow accumulation.

Extreme — 2 counties with 61+ PSF. Heavy-duty structural engineering required for extreme snowfall areas.

Case Study — 5 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.

New Hampshire Snow Load Map

Counties colored by snow load classification.

Highest Snow Load Counties

Belknap80 PSF

Hillsborough60 PSF

Merrimack60 PSF

Rockingham50 PSF

Strafford70 PSF

New Hampshire

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All 10 Counties — By Snow Load

County	Classification	Snow Load
Belknap	Extreme	80 PSF
Carroll	Case Study	Site Study
Cheshire	Case Study	Site Study
Coos	Case Study	Site Study
Grafton	Case Study	Site Study
Hillsborough	Heavy	60 PSF
Merrimack	Heavy	60 PSF
Rockingham	Heavy	50 PSF
Strafford	Extreme	70 PSF
Sullivan	Case Study	Site Study

Source: ASCE 7-22 ground snow load data

Frequently Asked Questions

What is the snow load in New Hampshire?

New Hampshire has an average ground snow load of 64 PSF, classified as extreme. Out of 10 counties: 3 heavy, 2 extreme, 5 case study.

Which New Hampshire counties have the highest snow load?

New Hampshire has 2 counties with extreme snow load (61+ PSF). New Hampshire has 3 counties with heavy snow load (41-60 PSF). 5 counties require a site-specific case study. See the county table above for a complete breakdown.

How do I check snow load for my New Hampshire 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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