Frost Line Depth in Rocklin, California
- 2 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Rocklin.
Nearby official codes require 18–30 in (2 verified codes).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 20 nights a year at or below 32 °F (NOAA 1991–2020, Auburn, 11.3 mi).
Checked Oct 2026. Report a correction
Does Rocklin have an official frost line depth?
No adopted frost line depth found for Rocklin in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 18 to 30 in. Use the deepest of them until the building department confirms Rocklin’s own number.
What frost line depth does Rocklin use for footings under Table R301.2(1)? Is it 18 in, like Placer County?
How deep do footings, decks and water lines need to be in Rocklin?
Drawn with the deepest nearby official value (30 in). Confirm Rocklin’s own depth before you dig.
House or garage footing in Rocklin: dig at least 30 in (76 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 30 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 30 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 36 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 30 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 Rocklin?
- J
- F
- M
- A
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- J
- J
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- D
Rocklin never averages a low below freezing. 20 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 37.2 °F.
NOAA 1991–2020 climate normals, Auburn station, 11.3 mi away, elevation 1,292 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 37.8 | 40 | 42.3 | 44.8 | 51.5 | 57.5 | 63.4 | 62.8 | 59.5 | 51.6 | 43.1 | 37.2 |
| High | 56.3 | 59.4 | 63.1 | 68.1 | 76.9 | 85.7 | 92.7 | 92 | 86.8 | 76.9 | 63.8 | 55.8 |
Rocklin has more freezing nights than 179 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 Rocklin use?
2 official codes near Rocklin are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Placer County | 18 in | 33 mi away |
| Brentwood | 30 in | 65 mi away |
How likely is the soil in Rocklin to heave?
USDA rates the sampled soil around Rocklin as 100% none for frost action (main soils: Exchequer, Inks, Cometa).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Rocklin at a glance
- Frost line depth
- No official local value
- County
- Placer County
- Population (2023 est.)
- 73,472
- Mean annual temperature
- 61.2 °F
- ZIP codes (4)
- 95648 · 95650 · 95677 · 95765