How much snow is too much for your roof?
ASCE 7's own building-code snow load map, the same figure used for permits and plan review, translated county by county into how many inches of snow that actually is on a roof, not just pounds per square foot. All 3,144 US counties, straight from the code map plus NOAA's 30-year snowfall normals - a county-level reference figure, not a substitute for the site-specific number a permit needs. Free, no email.
Snow already on the roof? Get a rough number first.
Now check what your roof is actually built for
Browse all 3,144 counties by state
- Alabama67
- Alaska30
- Arizona15
- Arkansas75
- California58
- Colorado64
- Connecticut9
- Delaware3
- District of Columbia1
- Florida67
- Georgia159
- Hawaii5
- Idaho44
- Illinois102
- Indiana92
- Iowa99
- Kansas105
- Kentucky120
- Louisiana64
- Maine16
- Maryland24
- Massachusetts14
- Michigan83
- Minnesota87
- Mississippi82
- Missouri115
- Montana56
- Nebraska93
- Nevada17
- New Hampshire10
- New Jersey21
- New Mexico33
- New York62
- North Carolina100
- North Dakota53
- Ohio88
- Oklahoma77
- Oregon36
- Pennsylvania67
- Rhode Island5
- South Carolina46
- South Dakota66
- Tennessee95
- Texas254
- Utah29
- Vermont14
- Virginia133
- Washington39
- West Virginia55
- Wisconsin72
- Wyoming23
The question this site answers
"How much snow load can my roof handle" has a real, code-defined answer for every US county: ASCE 7 sets a design ground snow load, and a formula turns it into the figure a roof is actually built to carry. SnowLoadCheck reports that figure for all 3,144 counties across 51 states, then does something no calculator does - turns the pounds-per-square-foot number into an inches-of-snow answer you can check against your own roof.
A county figure, not a permit number
386 US counties sit in mountain-west terrain where ASCE 7 itself skips a map figure and requires a site-specific study instead - reported here as exactly that, not guessed at. Everywhere else, this is a county-wide reference figure; an actual building permit needs the number at one address, which the ASCE 7 Hazard Tool provides directly.
Start with your county
Search or browse to your county for its design roof snow load, how it ranks nationally and against its own state, and how deep that load actually is in fresh snow, packed snow, or ice.