Frost Line Depth in Plano, Texas
- 5 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Plano.
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: 35 nights a year at or below 32 °F (NOAA 1991–2020, Richardson, 3.8 mi).
Checked Oct 2026. Report a correction
Does Plano have an official frost line depth?
No adopted frost line depth found for Plano 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 Plano’s own number.
What frost line depth does Plano use for footings under Table R301.2(1)? Is it 6 in, like Allen?
How deep do footings, decks and water lines need to be in Plano?
Drawn with the deepest nearby official value (6 in). Confirm Plano’s own depth before you dig.
House or garage footing in Plano: 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 Plano?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Plano never averages a low below freezing. 35 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 35.8 °F.
NOAA 1991–2020 climate normals, Richardson station, 3.8 mi away, elevation 678 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 35.8 | 39.5 | 47.5 | 54.8 | 63.6 | 71.2 | 75.3 | 74.5 | 67.1 | 56.1 | 45.6 | 38 |
| High | 55.9 | 60 | 68.6 | 75.4 | 82.6 | 90 | 94.3 | 94.8 | 87.3 | 77.5 | 66.1 | 57.3 |
Plano has more freezing nights than 91 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.
What frost line depth do towns near Plano use?
5 official codes near Plano are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Allen | 6 in | 6 mi away |
| Richardson | 6 in | 6 mi away |
| Frisco | 6 in | 8 mi away |
| Lewisville | 6 in | 13 mi away |
| Denton | 6 in | 26 mi away |
How likely is the soil in Plano to heave?
USDA rates the sampled soil around Plano as 100% none for frost action (main soils: Houston Black, Heiden, Austin).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Plano at a glance
- Frost line depth
- No official local value
- County
- Collin County
- Population (2023 est.)
- 290,190
- Mean annual temperature
- 65.8 °F
- ZIP codes (14)
- 75002 · 75010 · 75013 · 75023 · 75024 · 75025 · 75056 · 75074 · 75075 · 75082 · 75093 · 75094 · 75252 · 75287