Frost Line Depth in Washington County, Arkansas
- 1 verified code nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Washington County.
Nearby official codes require 18 in (1 verified code).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 94 nights a year at or below 32 °F (NOAA 1991–2020, Fayetteville Drake Fld, 3.5 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). The nearest official values, from codes we verified, are 18 in. Use the deepest of them until the building department confirms Washington County’s own number.
What frost line depth does Washington County use for footings under Table R301.2(1)? Is it 18 in, like Rogers?
How deep do footings, decks and water lines need to be in Washington County?
Drawn with the deepest nearby 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. 94 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 25.1 °F.
NOAA 1991–2020 climate normals, Fayetteville Drake Fld station, 3.5 mi away, elevation 1,251 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 25.1 | 28.5 | 36.1 | 44.5 | 54 | 62.6 | 66.5 | 64.9 | 56.5 | 45.2 | 35.3 | 27.8 |
| High | 47.7 | 52.2 | 60.7 | 69.7 | 76.7 | 84.6 | 89.2 | 89 | 81.5 | 70.9 | 59.4 | 49.8 |
Washington County has more freezing nights than 22 of the 25 other Arkansas places we track. The Arkansas median is 66. Coldest: Benton County; mildest: Miller County.
What frost line depth do towns near Washington County use?
One official code near Washington County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Rogers | 18 in | 24 mi away |
How likely is the soil in Washington County to heave?
USDA rates the sampled soil around Washington County as 76% none, 13% moderate, 11% high for frost action (main soils: Enders, Leesburg, Cleora).
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.)
- 261,549
- Mean annual temperature
- 57.4 °F
- ZIP codes (20)
- 72701 · 72703 · 72704 · 72717 · 72727 · 72729 · 72730 · 72734 · 72738 · 72744 · 72749 · 72753 · 72761 · 72762 · 72764 · 72769 · 72773 · 72774 · 72948 · 72959