Frost Line Depth in San Jacinto, California
- 4 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for San Jacinto.
Nearby official codes require 12 in (4 verified codes).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 15 nights a year at or below 32 °F (NOAA 1991–2020, San Jacinto, 1.2 mi).
Checked Oct 2026. Report a correction
Does San Jacinto have an official frost line depth?
No adopted frost line depth found for San Jacinto 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 San Jacinto’s own number.
What frost line depth does San Jacinto use for footings under Table R301.2(1)? Is it 12 in, like Chino?
How deep do footings, decks and water lines need to be in San Jacinto?
Drawn with the deepest nearby official value (12 in). Confirm San Jacinto’s own depth before you dig.
House or garage footing in San Jacinto: 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 Jacinto?
- J
- F
- M
- A
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- D
San Jacinto never averages a low below freezing. 15 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 39 °F.
NOAA 1991–2020 climate normals, San Jacinto station, 1.2 mi away, elevation 1,525 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 40.1 | 41.7 | 45 | 47.9 | 53.3 | 57.6 | 63.6 | 64.3 | 60.7 | 52.7 | 44.4 | 39 |
| High | 65.8 | 65.8 | 70.2 | 74.4 | 80.4 | 88.7 | 95.1 | 96.5 | 91.8 | 82.3 | 72.7 | 65 |
San Jacinto has more freezing nights than 156 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 Jacinto use?
4 official codes near San Jacinto are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Chino | 12 in | 40 mi away |
| Mission Viejo | 12 in | 40 mi away |
| Santa Ana | 12 in | 51 mi away |
| Glendora | 12 in | 54 mi away |
How likely is the soil in San Jacinto to heave?
USDA rates the sampled soil around San Jacinto as 13% none, 87% moderate for frost action (main soils: Traver, Grangeville, San Emigdio).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
San Jacinto at a glance
- Frost line depth
- No official local value
- County
- Riverside County
- Population (2023 est.)
- 55,440
- Mean annual temperature
- 65 °F
- ZIP codes (5)
- 92543 · 92555 · 92567 · 92582 · 92583