Frost Line Depth in Lexington-Fayette urban county, Kentucky
- Kentucky state rule
- Checked Oct 2026
- Sources
State-set value
24in
61 cm · 2 ft
24 in (Kentucky rule)
Set by the state: Kentucky Residential Code Table R403.1.4, all other counties.
Source and how we checked
Lexington-Fayette urban county does not publish its own value; the state rule applies.
Document: codes.iccsafe.org
Climate: 90 nights a year at or below 32 °F (NOAA 1991–2020, Lexington Bluegrass Airport, 8 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Lexington-Fayette urban county?
Kentucky sets the frost footing depth for Lexington-Fayette urban county at 24 in (61 cm). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).
Who sets the frost line depth in Lexington-Fayette urban county?
Kentucky writes this depth into its statewide residential code, so Lexington-Fayette urban county’s building department enforces the state’s number rather than setting its own. Fayette County uses the same 24 in, so the depth does not change at the city limits. See how Kentucky sets frost line depth.
How deep do footings, decks and water lines need to be in Lexington-Fayette urban county?
House or garage footing in Lexington-Fayette urban county: dig at least 24 in (61 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 24 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 24 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 30 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 24 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 Lexington-Fayette urban county?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Dec to Feb. 90 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 25.4 °F.
NOAA 1991–2020 climate normals, Lexington Bluegrass Airport station, 8 mi away, elevation 980 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 25.4 | 28.3 | 35.8 | 45.2 | 55 | 62.8 | 66.5 | 65.2 | 58.1 | 47 | 36.4 | 29.6 |
| High | 42.3 | 46.8 | 56.1 | 67.2 | 75.8 | 83.8 | 86.9 | 86.2 | 80.2 | 68.6 | 55.8 | 45.9 |
Lexington-Fayette urban county has fewer freezing nights than 10 of the 20 other Kentucky places we track. The Kentucky median is 90. Coldest: Shelby County; mildest: Barren County.
How likely is the soil in Lexington-Fayette urban county to heave?
USDA rates the sampled soil around Lexington-Fayette urban county as 37% none, 42% moderate, 21% high for frost action (main soils: Maury, Bluegrass, Lawrence).
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 Lexington-Fayette urban county?
Lexington-Fayette urban county at a glance
- Frost line depth
- 24 in (Kentucky rule)
- County
- Fayette County
- Population (2023 est.)
- 320,154
- Mean annual temperature
- 56.3 °F
- ZIP codes (19)
- 40324 · 40361 · 40391 · 40502 · 40503 · 40504 · 40505 · 40507 · 40508 · 40509 · 40510 · 40511 · 40513 · 40514 · 40515 · 40516 · 40517 · 40526 · 40536