Frost Line Depth in Lake County, Indiana
- Indiana state rule
- Checked Oct 2026
- Sources
State-set value
36in
91 cm · 3 ft
36 in (Indiana rule)
Set by the state: Indiana Residential Code Table R301.2(1), Lake County (state sets the whole design table).
Source and how we checked
Lake County does not publish its own value; the state rule applies.
Document: codes.iccsafe.org
Climate: 136 nights a year at or below 32 °F (NOAA 1991–2020, Lowell, 14.5 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Lake County?
Indiana sets the frost footing depth for Lake County at 36 in (91 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 Lake County?
Indiana writes this depth into its statewide residential code, so Lake County’s building department enforces the state’s number rather than setting its own. See how Indiana sets frost line depth.
How deep do footings, decks and water lines need to be in Lake County?
House or garage footing in Lake County: dig at least 36 in (91 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 36 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 36 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 42 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 36 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 Lake County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Nov to Mar. 136 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 15 °F.
NOAA 1991–2020 climate normals, Lowell station, 14.5 mi away, elevation 665 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 15 | 17.7 | 27.3 | 37.7 | 48.9 | 59.1 | 62.5 | 60.4 | 52.5 | 41 | 30.2 | 20.9 |
| High | 31.5 | 35.8 | 47.4 | 60.3 | 71.3 | 80.7 | 83.5 | 81.8 | 76.8 | 63.9 | 49.1 | 36.9 |
Lake County has more freezing nights than 54 of the 55 other Indiana places we track. The Indiana median is 120. Coldest: LaGrange County; mildest: Evansville.
What frost line depth do towns near Lake County use?
One official code near Lake County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Porter County | 36 in | 16 mi away |
How likely is the soil in Lake County to heave?
USDA rates the sampled soil around Lake County as 43% moderate, 57% high for frost action (main soils: Elliott, Pewamo, Rensselaer).
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 Lake County?
Lake County at a glance
- Frost line depth
- 36 in (Indiana rule)
- Population (2023 est.)
- 500,598
- Mean annual temperature
- 49.7 °F
- ZIP codes (28)
- 46303 · 46307 · 46311 · 46312 · 46319 · 46320 · 46321 · 46322 · 46323 · 46324 · 46327 · 46341 · 46342 · 46356 · 46373 · 46375 · 46376 · 46377 · 46394 · 46402 · 46403 · 46404 · 46405 · 46406 · 46407 · 46408 · 46409 · 46410