Frost Line Depth in Kings County, New York
- New York state rule
- Checked Oct 2026
- Sources
State-set value
48in
122 cm · 4 ft
48 in (New York rule)
Set by the state: New York City Building Code 2022 §1809.3.1 (4 ft below the lowest adjacent exposed grade).
Source and how we checked
Kings County does not publish its own value; the state rule applies.
We searched this place’s own code and website and found no published frost line depth.
Climate: 66 nights a year at or below 32 °F (NOAA 1991–2020, Ny Ave V Brooklyn, 3.3 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Kings County?
New York City sets the frost footing depth for Kings County at 48 in (122 cm, 4 ft). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).
Who sets the frost line depth in Kings County?
New York writes this depth into its statewide residential code, so Kings County’s building department enforces the state’s number rather than setting its own. See how New York sets frost line depth.
How deep do footings, decks and water lines need to be in Kings County?
House or garage footing in Kings County: dig at least 48 in (122 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 48 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 48 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 54 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 48 in | No code rule; common practice is below the frost line |
Work out posts, concrete and footing sizes with the fence post depth calculator or the deck footing calculator.
How cold does it get in Kings County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Jan to Feb. 66 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 27.5 °F.
NOAA 1991–2020 climate normals, Ny Ave V Brooklyn station, 3.3 mi away, elevation 20 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 27.5 | 29.1 | 35.2 | 44.8 | 54.4 | 64 | 70.3 | 68.9 | 62.4 | 51.2 | 41.4 | 33.2 |
| High | 39.7 | 42.4 | 49.7 | 60.5 | 70.5 | 79.3 | 84.8 | 83.3 | 76.5 | 65 | 54.3 | 44.5 |
Kings County has fewer freezing nights than 67 of the 67 other New York places we track. The New York median is 141. Coldest: Franklin County; mildest: Kings County.
What frost line depth do towns near Kings County use?
One official code near Kings County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Mount Vernon | 42 in | 20 mi away |
How likely is the soil in Kings County to heave?
USDA rates the sampled soil around Kings County as 6% low, 94% moderate for frost action (main soils: Flatbush, Greenbelt, Laguardia).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
How do you confirm the frost line before you dig in Kings County?
Kings County at a glance
- Frost line depth
- 48 in (New York rule)
- Population (2023 est.)
- 2,561,225
- Mean annual temperature
- 55.5 °F
- ZIP codes (40)
- 11201 · 11203 · 11204 · 11205 · 11206 · 11207 · 11208 · 11209 · 11210 · 11211 · 11212 · 11213 · 11214 · 11215 · 11216 · 11217 · 11218 · 11219 · 11220 · 11221 · 11222 · 11223 · 11224 · 11225 · 11226 · 11228 · 11229 · 11230 · 11231 · 11232 · 11233 · 11234 · 11235 · 11236 · 11237 · 11238 · 11239 · 11249 · 11416 · 11417