Frost Line Depth in Dallas County, Texas
- 5 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Dallas County.
Nearby official codes require 6 in (5 verified codes).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 23 nights a year at or below 32 °F (NOAA 1991–2020, Dallas Love Fld, 7.4 mi).
Checked Oct 2026. Report a correction
Does Dallas County have an official frost line depth?
No adopted frost line depth found for Dallas 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 Dallas County’s own number.
What frost line depth does Dallas County use for footings under Table R301.2(1)? Is it 6 in, like Lancaster?
How deep do footings, decks and water lines need to be in Dallas County?
Drawn with the deepest nearby official value (6 in). Confirm Dallas County’s own depth before you dig.
House or garage footing in Dallas 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 Dallas County?
- J
- F
- M
- A
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- J
- J
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- D
Dallas County never averages a low below freezing. 23 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 37.9 °F.
NOAA 1991–2020 climate normals, Dallas Love Fld station, 7.4 mi away, elevation 440 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 37.9 | 41.9 | 49.4 | 56.8 | 66 | 73.8 | 77.7 | 77.4 | 70.1 | 58.7 | 47.8 | 39.8 |
| High | 57.7 | 62 | 69.9 | 77.4 | 84.9 | 92.7 | 96.9 | 97.1 | 90 | 79.5 | 67.8 | 59.2 |
Dallas County has fewer freezing nights than 109 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
What frost line depth do towns near Dallas County use?
5 official codes near Dallas County are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Lancaster | 6 in | 12 mi away |
| Richardson | 6 in | 15 mi away |
| Lewisville | 6 in | 23 mi away |
| Allen | 6 in | 24 mi away |
| Mansfield | 6 in | 24 mi away |
How likely is the soil in Dallas County to heave?
USDA rates the sampled soil around Dallas County as 100% none for frost action (main soils: Trinity, Bastsil, Austin).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Dallas County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 2,606,358
- Mean annual temperature
- 68 °F
- ZIP codes (95)
- 75001 · 75006 · 75007 · 75019 · 75038 · 75039 · 75040 · 75041 · 75042 · 75043 · 75044 · 75048 · 75050 · 75051 · 75052 · 75054 · 75060 · 75061 · 75062 · 75063 · 75067 · 75080 · 75081 · 75082 · 75088 · 75089 · 75098 · 75104 · 75115 · 75116 · 75125 · 75134 · 75137 · 75141 · 75146 · 75149 · 75150 · 75154 · 75159 · 75172 · 75180 · 75181 · 75182 · 75201 · 75202 · 75203 · 75204 · 75205 · 75206 · 75207 · 75208 · 75209 · 75210 · 75211 · 75212 · 75214 · 75215 · 75216 · 75217 · 75218 · 75219 · 75220 · 75223 · 75224 · 75225 · 75226 · 75227 · 75228 · 75229 · 75230 · 75231 · 75232 · 75233 · 75234 · 75235 · 75236 · 75237 · 75238 · 75240 · 75241 · 75243 · 75244 · 75246 · 75247 · 75248 · 75249 · 75251 · 75252 · 75253 · 75254 · 75270 · 75287 · 75390 · 76051 · 76065