Grand Isle County, VT Roof Snow Load - 28 psf
What ASCE 7 says about snow load in Grand Isle County
That's Grand Isle County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from.
Converted to something you can actually eyeball on a roof: about 61.6 in. of fresh powder, 22.4 in. once it settles and packs down, or just 5.6 in. if it's turned to ice. This is a meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Grand Isle County in numbers
- Design roof snow load28 psf
- Ground snow load, ASCE 7 map40 psf
- National rank#270 of 2,758
- Vermont rank#5 of 5
- Population7,528
- Annual snowfall, NOAA normal50.1 in.
- FIPS50013
Where Grand Isle County's figure sits nationally
Out of 2,758 rated US counties, Grand Isle County sits at #270, the top 10% nationally - #5 of 5 within Vermont. Vermont counties average 32.2 psf; Grand Isle County runs 4.2 psf lower than that.
Near 44.8018°N 73.3008°W, FIPS 50013: Grand Isle County counts 7,528 residents and a 40 psf map value, which the code's own factors turn into 28 psf.
How much it actually snows in Grand Isle County
Most winters bring Grand Isle County roughly 50.1 in. of snow - NOAA's normal at S HERO, VT US, 12.1 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Grand Isle County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Grand Isle County's county-wide figure. (How this figure is calculated.)