Frost Line Depth in Newport Beach, California
- 3 verified codes nearby
- Checked Oct 2026
No official local value
Frost rarely reaches the ground in Newport Beach.
Nearby official codes require 12 in (3 verified codes).
Footings still go at least 12 in (30 cm) below undisturbed ground (IRC R403.1.4).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 0 nights a year at or below 32 °F (NOAA 1991–2020, Newport Beach Harbor, 0.6 mi).
Checked Oct 2026. Report a correction
Does Newport Beach have an official frost line depth?
No adopted frost line depth found for Newport Beach 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 Newport Beach’s own number.
What frost line depth does Newport Beach use for footings under Table R301.2(1)? Is it 12 in, like Santa Ana?
How deep do footings, decks and water lines need to be in Newport Beach?
Drawn with the deepest nearby official value (12 in). Confirm Newport Beach’s own depth before you dig.
House or garage footing in Newport Beach: 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 Newport Beach?
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Newport Beach never averages a low below freezing. 0 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 49.8 °F.
NOAA 1991–2020 climate normals, Newport Beach Harbor station, 0.6 mi away, elevation 10 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 50.4 | 51 | 53.1 | 55.1 | 58.3 | 61.5 | 64.6 | 65.5 | 64.1 | 60.2 | 54.5 | 49.8 |
| High | 64.5 | 63.3 | 64.7 | 65.9 | 66.7 | 68.4 | 71.8 | 73.3 | 74.1 | 72.7 | 68.4 | 64.1 |
Newport Beach has fewer freezing nights than 166 of the 208 other California places we track. The California median is 3. Coldest: El Dorado County; mildest: San Diego.
What frost line depth do towns near Newport Beach use?
3 official codes near Newport Beach are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Santa Ana | 12 in | 10 mi away |
| Mission Viejo | 12 in | 13 mi away |
| Norwalk | 12 in | 24 mi away |
How likely is the soil in Newport Beach to heave?
USDA rates the sampled soil around Newport Beach as 50% none, 50% low for frost action (main soils: Beaches, Alo, Balcom).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Newport Beach at a glance
- Frost line depth
- No official local value
- County
- Orange County
- Population (2023 est.)
- 82,637
- Mean annual temperature
- 62.8 °F
- ZIP codes (11)
- 92612 · 92617 · 92625 · 92627 · 92651 · 92657 · 92660 · 92661 · 92662 · 92663 · 92697