Frost Line Depth in Bremerton, Washington
- Bremerton’s adopted code
- Checked Oct 2026
- Sources
Verified
12in
30 cm · 1 ft
Set in the building code Bremerton has adopted.
Source and how we checked
Document: ecode360.com
Climate: 42 nights a year at or below 32 °F (NOAA 1991–2020, Bremerton, 2.6 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Bremerton?
Bremerton's building authority sets the frost line depth at 12 in (30 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 Bremerton?
Washington leaves the frost line depth to each city or county, and Bremerton fills it in when it adopts the residential code. The value above comes from Bremerton’s own document on ecode360.com. See how Washington sets frost line depth.
How deep do footings, decks and water lines need to be in Bremerton?
House or garage footing in Bremerton: 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 Bremerton?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Bremerton never averages a low below freezing. 42 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 35 °F.
NOAA 1991–2020 climate normals, Bremerton station, 2.6 mi away, elevation 110 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 35.6 | 35.1 | 37.7 | 41 | 46.5 | 51.1 | 54.6 | 55.1 | 51.1 | 44.7 | 38.7 | 35 |
| High | 46.6 | 49.4 | 53.7 | 59 | 65.8 | 70.2 | 76.5 | 77.3 | 71.9 | 60.6 | 51.2 | 45.6 |
Bremerton has fewer freezing nights than 32 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 Bremerton use?
4 official codes near Bremerton are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Mason County | 12 in | 25 mi away |
| Lynnwood | 18 in | 28 mi away |
| Redmond | 12 in | 30 mi away |
| Everett | 18 in | 38 mi away |
How likely is the soil in Bremerton to heave?
USDA rates the sampled soil around Bremerton as 63% none, 37% low for frost action (main soils: Alderwood, Kilchis, Neilton).
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 Bremerton?
Bremerton at a glance
- Frost line depth
- 12 in
- County
- Kitsap County
- Population (2023 est.)
- 45,450
- Mean annual temperature
- 52.3 °F
- ZIP codes (5)
- 98310 · 98312 · 98314 · 98337 · 98367