Frost Line Depth in Flower Mound, Texas
- Flower Mound’s adopted code
- Checked Oct 2026
- Sources
Verified
6in
15 cm · 6 in
Set in the building code Flower Mound has adopted.
Footings still go at least 12 in (30 cm) below undisturbed ground (IRC R403.1.4).
Source and how we checked
Document: mcclibraryfunctions.azurewebsites.us
Climate: 44 nights a year at or below 32 °F (NOAA 1991–2020, Grapevine Dam, 6.9 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Flower Mound?
Flower Mound's 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 Flower Mound?
Texas leaves the frost line depth to each city or county, and Flower Mound fills it in when it adopts the residential code. The value above comes from Flower Mound’s own document on mcclibraryfunctions.azurewebsites.us. See how Texas sets frost line depth.
How deep do footings, decks and water lines need to be in Flower Mound?
House or garage footing in Flower Mound: 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 Flower Mound?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Flower Mound never averages a low below freezing. 44 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 34.1 °F.
NOAA 1991–2020 climate normals, Grapevine Dam station, 6.9 mi away, elevation 585 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 34.1 | 38.3 | 45.4 | 53.5 | 62.8 | 71.1 | 74.1 | 73.9 | 66.7 | 55.1 | 44.7 | 36.3 |
| High | 55.7 | 60.3 | 67.7 | 75.3 | 82.5 | 90.8 | 95.3 | 95.7 | 88.6 | 78.4 | 66.3 | 57.7 |
Flower Mound has more freezing nights than 126 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
What frost line depth do towns near Flower Mound use?
5 official codes near Flower Mound are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Lewisville | 6 in | 8 mi away |
| Keller | 6 in | 10 mi away |
| Denton | 6 in | 13 mi away |
| Frisco | 6 in | 19 mi away |
| Richardson | 6 in | 24 mi away |
How likely is the soil in Flower Mound to heave?
USDA rates the sampled soil around Flower Mound as 100% none for frost action (main soils: Gasil, Konsil, Callisburg).
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 Flower Mound?
Flower Mound at a glance
- Frost line depth
- 6 in
- County
- Denton County
- Population (2023 est.)
- 79,445
- Mean annual temperature
- 65.4 °F
- ZIP codes (7)
- 75022 · 75028 · 75067 · 75077 · 76051 · 76226 · 76262