Frost Line Depth in Lubbock, Texas
- Lubbock’s adopted code
- Checked Oct 2026
- Sources
Verified
12in
30 cm · 1 ft
Set in the building code Lubbock has adopted.
Source and how we checked
Document: ecode360.com
Climate: 61 nights a year at or below 32 °F (NOAA 1991–2020, Lubbock Wfo, 2.4 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Lubbock?
Lubbock's building authority sets the frost line depth at 12 in (30 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 Lubbock?
Texas leaves the frost line depth to each city or county, and Lubbock fills it in when it adopts the residential code. The value above comes from Lubbock’s own document on ecode360.com. See how Texas sets frost line depth.
How deep do footings, decks and water lines need to be in Lubbock?
House or garage footing in Lubbock: dig at least 12 in (30 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 12 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 12 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 18 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 12 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 Lubbock?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Dec to Feb. 61 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 29.5 °F.
NOAA 1991–2020 climate normals, Lubbock Wfo station, 2.4 mi away, elevation 3,235 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 29.5 | 31.7 | 39 | 47.5 | 57 | 65.8 | 69.6 | 68.7 | 60.6 | 49.5 | 38.2 | 30.1 |
| High | 55 | 59.4 | 67.5 | 76 | 83.7 | 90.9 | 92.7 | 91.2 | 84.2 | 75.8 | 64 | 55.2 |
Lubbock has more freezing nights than 160 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
How likely is the soil in Lubbock to heave?
USDA rates the sampled soil around Lubbock as 100% none for frost action (main soils: Amarillo, Acuff, Estacado).
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 Lubbock?
Lubbock at a glance
- Frost line depth
- 12 in
- County
- Lubbock County
- Population (2023 est.)
- 266,878
- Mean annual temperature
- 61.8 °F
- ZIP codes (16)
- 79382 · 79401 · 79402 · 79403 · 79404 · 79406 · 79407 · 79410 · 79411 · 79412 · 79413 · 79414 · 79415 · 79416 · 79423 · 79424