Frost Line Depth in Round Rock, Texas
- 4 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Round Rock.
Nearby official codes require 6–12 in (4 verified codes).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 27 nights a year at or below 32 °F (NOAA 1991–2020, Austin Great Hills, 10 mi).
Checked Oct 2026. Report a correction
Does Round Rock have an official frost line depth?
No adopted frost line depth found for Round Rock in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 6 to 12 in. Use the deepest of them until the building department confirms Round Rock’s own number.
What frost line depth does Round Rock use for footings under Table R301.2(1)? Is it 6 in, like Cedar Park?
How deep do footings, decks and water lines need to be in Round Rock?
Drawn with the deepest nearby official value (12 in). Confirm Round Rock’s own depth before you dig.
House or garage footing in Round Rock: 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 Round Rock?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Round Rock never averages a low below freezing. 27 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 37.6 °F.
NOAA 1991–2020 climate normals, Austin Great Hills station, 10 mi away, elevation 880 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 37.6 | 40.9 | 47.9 | 54.8 | 63.7 | 70.4 | 72.6 | 72.4 | 66.5 | 57 | 47 | 38.5 |
| High | 59.7 | 65.4 | 71.9 | 78.8 | 84.4 | 92.4 | 95.7 | 96.3 | 89.4 | 80.3 | 68.6 | 61.4 |
Round Rock has fewer freezing nights than 101 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
What frost line depth do towns near Round Rock use?
4 official codes near Round Rock are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Cedar Park | 6 in | 10 mi away |
| Leander | 6 in | 12 mi away |
| Austin | 12 in | 17 mi away |
| Kyle | 6 in | 39 mi away |
How likely is the soil in Round Rock to heave?
USDA rates the sampled soil around Round Rock as 100% none for frost action (main soils: Eckrant, Krum, Houston Black).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Round Rock at a glance
- Frost line depth
- No official local value
- County
- Williamson County
- Population (2023 est.)
- 130,406
- Mean annual temperature
- 67.2 °F
- ZIP codes (8)
- 78626 · 78628 · 78634 · 78660 · 78664 · 78665 · 78681 · 78728