Frost Line Depth in San Clemente, California
- San Clemente’s adopted code
- Checked Oct 2026
- Sources
Verified
12in
30 cm · 1 ft
Set in the building code San Clemente has adopted.
Source and how we checked
Document: library.municode.com
Climate: 1 night a year at or below 32 °F (NOAA 1991–2020, Laguna Beach, 11.8 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in San Clemente?
San Clemente'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 San Clemente?
California leaves the frost line depth to each city or county, and San Clemente fills it in when it adopts the residential code. The value above comes from San Clemente’s own document on library.municode.com. See how California sets frost line depth.
How deep do footings, decks and water lines need to be in San Clemente?
House or garage footing in San Clemente: 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 San Clemente?
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- D
San Clemente never averages a low below freezing. 1 night a year reach 32 °F or colder; Dec is coldest, with an average low of 43.8 °F.
NOAA 1991–2020 climate normals, Laguna Beach station, 11.8 mi away, elevation 44 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 44.2 | 44.8 | 47.9 | 50.1 | 54.5 | 57.8 | 60.1 | 61.2 | 58.5 | 55.1 | 48.5 | 43.8 |
| High | 68.4 | 67.8 | 69.3 | 72.5 | 74.5 | 76 | 79.5 | 81.2 | 81 | 77.2 | 72.2 | 67.3 |
San Clemente has fewer freezing nights than 135 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 San Clemente use?
3 official codes near San Clemente are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Mission Viejo | 12 in | 11 mi away |
| Santa Ana | 12 in | 25 mi away |
| Chino | 12 in | 37 mi away |
How likely is the soil in San Clemente to heave?
USDA rates the sampled soil around San Clemente as 87% none, 13% low for frost action (main soils: Calleguas, Alo, Bosanko).
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 San Clemente?
San Clemente at a glance
- Frost line depth
- 12 in
- County
- Orange County
- Population (2023 est.)
- 62,313
- Mean annual temperature
- 63.1 °F
- ZIP codes (3)
- 92624 · 92672 · 92673