SnowLoadCheck

Bronx County, NY Roof Snow Load - 20 psf

What ASCE 7 says about snow load in Bronx County

Moderate
20 psf

That's Bronx County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 20 psf - higher than the 17.5 psf the ground-load formula alone would give, and the code says use the larger one.

Converted to something you can actually eyeball on a roof: about 44 in. of fresh powder, 16 in. once it settles and packs down, or just 4 in. if it's turned to ice. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.

Already snow on the roof in Bronx County?

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Bronx County in numbers

Where Bronx County's figure sits nationally

Out of 2,758 rated US counties, Bronx County sits at #503, the top 18% nationally - #27 of 28 within New York. 25.4 psf is New York's typical county figure - Bronx County comes in 5.4 psf under it.

Near 40.8487°N 73.8529°W, FIPS 36005: Bronx County counts 1,384,724 residents and a 25 psf map value, which the code's own factors turn into 20 psf.

How much it actually snows in Bronx County

Most winters bring Bronx County roughly 29.8 in. of snow - NOAA's normal at NEW YORK LAGUARDIA AP, NY US, 5 mi off. (fresh vs. packed vs. ice explains why.)

Read this before you rely on it

Bronx 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 Bronx County's county-wide figure. See the methodology guide.