Frost Line Depth in Las Cruces, New Mexico
- Las Cruces’s adopted code
- Checked Oct 2026
- Sources
Verified
6in
15 cm · 6 in
Set in the building code Las Cruces has adopted.
Footings still go at least 12 in (30 cm) below undisturbed ground (IRC R403.1.4).
Source and how we checked
Document: library.municode.com
Climate: 69 nights a year at or below 32 °F (NOAA 1991–2020, State Univ, 3.5 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Las Cruces?
Las Cruces' building authority sets the frost line depth at 6 in (15 cm). Footings, piers and other permanent supports still go at least 12 in below undisturbed ground (IRC R403.1.4).
Who sets the frost line depth in Las Cruces?
New Mexico leaves the frost line depth to each city or county, and Las Cruces fills it in when it adopts the residential code. The value above comes from Las Cruces’s own document on library.municode.com. See how New Mexico sets frost line depth.
How deep do footings, decks and water lines need to be in Las Cruces?
House or garage footing in Las Cruces: 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 | 12 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 Las Cruces?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Dec to Jan. 69 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 29.6 °F.
NOAA 1991–2020 climate normals, State Univ station, 3.5 mi away, elevation 3,886 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 29.6 | 33.5 | 39.2 | 45.7 | 54.2 | 63.7 | 69.1 | 67.7 | 61.1 | 48.3 | 36.6 | 29.7 |
| High | 58.9 | 64.1 | 71.3 | 78.5 | 87.1 | 96.2 | 95.6 | 93.6 | 88.4 | 79.6 | 67.9 | 58.1 |
Las Cruces has fewer freezing nights than 14 of the 16 other New Mexico places we track. The New Mexico median is 124. Coldest: McKinley County; mildest: Lea County.
How likely is the soil in Las Cruces to heave?
USDA rates the sampled soil around Las Cruces as 97% none, 3% low for frost action (main soils: Bluepoint, Glendale, Armijo).
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 Las Cruces?
Las Cruces at a glance
- Frost line depth
- 6 in
- County
- Doña Ana County
- Population (2023 est.)
- 114,892
- Mean annual temperature
- 63.2 °F
- ZIP codes (6)
- 88001 · 88003 · 88005 · 88007 · 88011 · 88012