Frost Line Depth in Doña Ana County, New Mexico
- 1 verified code nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Doña Ana County.
Nearby official codes require 6 in (1 verified code).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 69 nights a year at or below 32 °F (NOAA 1991–2020, State Univ, 6.4 mi).
Checked Oct 2026. Report a correction
Does Doña Ana County have an official frost line depth?
No adopted frost line depth found for Doña Ana County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 6 in. Use the deepest of them until the building department confirms Doña Ana County’s own number.
What frost line depth does Doña Ana County use for footings under Table R301.2(1)? Is it 6 in, like Las Cruces?
How deep do footings, decks and water lines need to be in Doña Ana County?
Drawn with the deepest nearby official value (6 in). Confirm Doña Ana County’s own depth before you dig.
House or garage footing in Doña Ana County: 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 Doña Ana County?
- 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, 6.4 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 |
Doña Ana County 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.
What frost line depth do towns near Doña Ana County use?
One official code near Doña Ana County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Las Cruces | 6 in | 3 mi away |
How likely is the soil in Doña Ana County to heave?
USDA rates the sampled soil around Doña Ana County as 96% none, 4% low for frost action (main soils: Bluepoint, Glendale, Anapra).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Doña Ana County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 225,210
- Mean annual temperature
- 63.2 °F
- ZIP codes (26)
- 79835 · 79922 · 87936 · 87937 · 87940 · 87941 · 88001 · 88002 · 88003 · 88004 · 88005 · 88007 · 88008 · 88011 · 88012 · 88021 · 88024 · 88027 · 88044 · 88046 · 88047 · 88048 · 88052 · 88063 · 88072 · 88081