Frost Line Depth in Grays Harbor County, Washington
- 3 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Grays Harbor County.
Nearby official codes require 12 in (3 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, Aberdeen, 10.2 mi).
Checked Oct 2026. Report a correction
Does Grays Harbor County have an official frost line depth?
No adopted frost line depth found for Grays Harbor County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 12 in. Use the deepest of them until the building department confirms Grays Harbor County’s own number.
What frost line depth does Grays Harbor County use for footings under Table R301.2(1)? Is it 12 in, like Mason County?
How deep do footings, decks and water lines need to be in Grays Harbor County?
Drawn with the deepest nearby official value (12 in). Confirm Grays Harbor County’s own depth before you dig.
House or garage footing in Grays Harbor County: 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 Grays Harbor County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
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- N
- D
Grays Harbor County never averages a low below freezing. 35 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 36.5 °F.
NOAA 1991–2020 climate normals, Aberdeen station, 10.2 mi away, elevation 10 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 37.3 | 36.7 | 38.4 | 41.1 | 46.6 | 51.2 | 54.2 | 54.4 | 51.1 | 44.8 | 39.6 | 36.5 |
| High | 47.8 | 50.3 | 53.3 | 56.6 | 61.4 | 64.7 | 68.2 | 69.3 | 68.7 | 61 | 52.3 | 47 |
Grays Harbor County has fewer freezing nights than 36 of the 47 other Washington places we track. The Washington median is 54. Coldest: Chelan County; mildest: Lakewood.
What frost line depth do towns near Grays Harbor County use?
3 official codes near Grays Harbor County are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Mason County | 12 in | 35 mi away |
| Bremerton | 12 in | 60 mi away |
| Clallam County | 12 in | 69 mi away |
How likely is the soil in Grays Harbor County to heave?
USDA rates the sampled soil around Grays Harbor County as 100% none for frost action (main soils: Hoquiam, Copalis, Grehalem).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Grays Harbor County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 77,290
- Mean annual temperature
- 51.3 °F
- ZIP codes (22)
- 98520 · 98526 · 98535 · 98536 · 98537 · 98541 · 98547 · 98550 · 98552 · 98557 · 98559 · 98562 · 98563 · 98566 · 98568 · 98569 · 98571 · 98575 · 98579 · 98583 · 98587 · 98595