Frost Line Depth in San Joaquin County, California
- 5 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for San Joaquin County.
Nearby official codes require 5–30 in (5 verified codes).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 19 nights a year at or below 32 °F (NOAA 1991–2020, Stockton Metro Airport, 4.1 mi).
Checked Oct 2026. Report a correction
Does San Joaquin County have an official frost line depth?
No adopted frost line depth found for San Joaquin County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 5 to 30 in. Use the deepest of them until the building department confirms San Joaquin County’s own number.
What frost line depth does San Joaquin County use for footings under Table R301.2(1)? Is it 30 in, like Brentwood?
How deep do footings, decks and water lines need to be in San Joaquin County?
Drawn with the deepest nearby official value (30 in). Confirm San Joaquin County’s own depth before you dig.
House or garage footing in San Joaquin County: 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 San Joaquin County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
San Joaquin County never averages a low below freezing. 19 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 38.4 °F.
NOAA 1991–2020 climate normals, Stockton Metro Airport station, 4.1 mi away, elevation 26 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 39.1 | 41.3 | 44.2 | 47.4 | 52.6 | 57.6 | 60.9 | 60.3 | 57.5 | 50.6 | 42.8 | 38.4 |
| High | 57 | 62.9 | 68.5 | 74.5 | 82.8 | 90.4 | 95.4 | 94.4 | 90.4 | 80.3 | 66.6 | 57.1 |
San Joaquin County has more freezing nights than 172 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 Joaquin County use?
5 official codes near San Joaquin County are verified; each links to its document.
How likely is the soil in San Joaquin County to heave?
USDA rates the sampled soil around San Joaquin County as 100% none for frost action (main soils: Jacktone, Urban land, Guard).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
San Joaquin County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 800,965
- Mean annual temperature
- 63 °F
- ZIP codes (37)
- 94505 · 95202 · 95203 · 95204 · 95205 · 95206 · 95207 · 95209 · 95210 · 95211 · 95212 · 95215 · 95219 · 95220 · 95227 · 95230 · 95231 · 95236 · 95237 · 95240 · 95242 · 95253 · 95258 · 95304 · 95320 · 95330 · 95336 · 95337 · 95361 · 95366 · 95376 · 95377 · 95385 · 95391 · 95632 · 95641 · 95686