Frost Line Depth in Harrison County, Texas
- Texas range from verified codes
- Checked Oct 2026
No official local value
No official frost line depth is published for Harrison County.
No verified code nearby; verified Texas codes range 0–12 in.
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 39 nights a year at or below 32 °F (NOAA 1991–2020, Marshall, 4.9 mi).
Checked Oct 2026. Report a correction
Does Harrison County have an official frost line depth?
No adopted frost line depth found for Harrison County in its official documents (checked Oct 2026). No verified code lies near Harrison County; the Texas codes we verified range from 0 to 12 in. Ask the building department for Harrison County’s own number before you dig.
What frost line depth does Harrison County use for footings under Table R301.2(1)?
How deep do footings, decks and water lines need to be in Harrison County?
Drawn with the deepest Texas official value (12 in). Confirm Harrison County’s own depth before you dig.
House or garage footing in Harrison 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 Harrison County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Harrison County never averages a low below freezing. 39 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 33.1 °F.
NOAA 1991–2020 climate normals, Marshall station, 4.9 mi away, elevation 302 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 33.1 | 36.7 | 43.7 | 50.8 | 60.1 | 67.8 | 70.8 | 70.3 | 63.8 | 51.8 | 42.1 | 34.9 |
| High | 57.1 | 61.5 | 68.7 | 76.3 | 83.3 | 90.2 | 93.9 | 94.2 | 88.3 | 78.3 | 67.2 | 58.9 |
Harrison County has more freezing nights than 109 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
How likely is the soil in Harrison County to heave?
USDA rates the sampled soil around Harrison County as 100% none for frost action (main soils: Kirvin, Cuthbert, Sacul).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Harrison County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 70,895
- Mean annual temperature
- 64.3 °F
- ZIP codes (15)
- 75601 · 75602 · 75605 · 75640 · 75642 · 75650 · 75651 · 75657 · 75659 · 75661 · 75670 · 75671 · 75672 · 75692 · 75694