Frost Line Depth in Washington County, Oklahoma
- Oklahoma range from verified codes
- Checked Oct 2026
No official local value
No official frost line depth is published for Washington County.
No verified code nearby; verified Oklahoma codes range 16–18 in.
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 109 nights a year at or below 32 °F (NOAA 1991–2020, Bartlesville 3, 7.1 mi).
Checked Oct 2026. Report a correction
Does Washington County have an official frost line depth?
No adopted frost line depth found for Washington County in its official documents (checked Oct 2026). No verified code lies near Washington County; the Oklahoma codes we verified range from 16 to 18 in. Ask the building department for Washington County’s own number before you dig.
What frost line depth does Washington County use for footings under Table R301.2(1)?
How deep do footings, decks and water lines need to be in Washington County?
Drawn with the deepest Oklahoma official value (18 in). Confirm Washington County’s own depth before you dig.
House or garage footing in Washington County: 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 Washington County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Dec to Feb. 109 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 21.5 °F.
NOAA 1991–2020 climate normals, Bartlesville 3 station, 7.1 mi away, elevation 715 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 21.5 | 25.7 | 34.2 | 43.7 | 54.4 | 64.2 | 68.4 | 65.9 | 57.4 | 45.2 | 33.1 | 25.1 |
| High | 47.5 | 52.7 | 61.6 | 71.3 | 78.7 | 87.6 | 92.7 | 92.2 | 84.8 | 73.6 | 61.1 | 49.3 |
Washington County has more freezing nights than 23 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 Washington County to heave?
USDA rates the sampled soil around Washington County as 100% none for frost action (main soils: Bates, Coweta, Dennis).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Washington County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 53,706
- Mean annual temperature
- 58 °F
- ZIP codes (12)
- 74003 · 74006 · 74021 · 74022 · 74029 · 74048 · 74051 · 74061 · 74070 · 74080 · 74082 · 74083