Frost Line Depth in Broken Arrow, Oklahoma
- Broken Arrow’s adopted code
- Checked Oct 2026
- Sources
Verified
18in
46 cm · 1 ft 6 in
Set in the building code Broken Arrow has adopted.
Source and how we checked
Document: library.municode.com
Climate: 87 nights a year at or below 32 °F (NOAA 1991–2020, Bixby, 6.8 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Broken Arrow?
Broken Arrow's building authority sets the frost line depth at 18 in (46 cm). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).
Who sets the frost line depth in Broken Arrow?
Oklahoma leaves the frost line depth to each city or county, and Broken Arrow fills it in when it adopts the residential code. The value above comes from Broken Arrow’s own document on library.municode.com. See how Oklahoma sets frost line depth.
How deep do footings, decks and water lines need to be in Broken Arrow?
House or garage footing in Broken Arrow: dig at least 18 in (46 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 18 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 18 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 24 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 18 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 Broken Arrow?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Dec to Feb. 87 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 25.8 °F.
NOAA 1991–2020 climate normals, Bixby station, 6.8 mi away, elevation 605 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 25.8 | 28.8 | 38.1 | 46.6 | 57.3 | 66.9 | 70.5 | 68.6 | 60.2 | 47.7 | 36.1 | 28.7 |
| High | 48.9 | 54.4 | 63.3 | 72.4 | 79.6 | 88.1 | 93.5 | 92.9 | 85.1 | 74.3 | 61.6 | 51.8 |
Broken Arrow has more freezing nights than 18 of the 23 other Oklahoma places we track. The Oklahoma median is 72. Coldest: Washington County; mildest: Pittsburg County.
How likely is the soil in Broken Arrow to heave?
USDA rates the sampled soil around Broken Arrow as 100% none for frost action (main soils: Dennis, Okay, Okemah).
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 Broken Arrow?
Broken Arrow at a glance
- Frost line depth
- 18 in
- County
- Tulsa County
- Population (2023 est.)
- 119,194
- Mean annual temperature
- 60 °F
- ZIP codes (6)
- 74008 · 74011 · 74012 · 74014 · 74133 · 74134