Frost Line Depth in San Patricio County, Texas
- 1 verified code nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for San Patricio County.
Nearby official codes require 12 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: 7 nights a year at or below 32 °F (NOAA 1991–2020, Sinton, 2.6 mi).
Checked Oct 2026. Report a correction
Does San Patricio County have an official frost line depth?
No adopted frost line depth found for San Patricio County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 12 in. Use the deepest of them until the building department confirms San Patricio County’s own number.
What frost line depth does San Patricio County use for footings under Table R301.2(1)? Is it 12 in, like Victoria?
How deep do footings, decks and water lines need to be in San Patricio County?
Drawn with the deepest nearby official value (12 in). Confirm San Patricio County’s own depth before you dig.
House or garage footing in San Patricio 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 | 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 San Patricio County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
San Patricio County never averages a low below freezing. 7 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 44.9 °F.
NOAA 1991–2020 climate normals, Sinton station, 2.6 mi away, elevation 48 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 44.9 | 49.4 | 55.5 | 61.6 | 69.2 | 74.4 | 76 | 75.9 | 71.4 | 62.9 | 53.6 | 46.5 |
| High | 66.4 | 70.2 | 75.4 | 80.8 | 86 | 91 | 92.8 | 94.6 | 90.3 | 84.5 | 75.4 | 68.2 |
San Patricio County has fewer freezing nights than 143 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
What frost line depth do towns near San Patricio County use?
One official code near San Patricio County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Victoria | 12 in | 65 mi away |
How likely is the soil in San Patricio County to heave?
USDA rates the sampled soil around San Patricio County as 100% none for frost action (main soils: Calallen, Victoria, Orelia).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
San Patricio County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 70,660
- Mean annual temperature
- 71.5 °F
- ZIP codes (9)
- 78336 · 78352 · 78359 · 78362 · 78368 · 78370 · 78374 · 78387 · 78390