Frost Line Depth in Pima County, Arizona
- 1 verified code nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Pima County.
Nearby official codes require 0 in (1 verified code).
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 59 nights a year at or below 32 °F (NOAA 1991–2020, Kitt Peak, 15.9 mi).
Checked Oct 2026. Report a correction
Does Pima County have an official frost line depth?
No adopted frost line depth found for Pima County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 0 in. Use the deepest of them until the building department confirms Pima County’s own number.
What frost line depth does Pima County use for footings under Table R301.2(1)? Is it 0 in, like Casa Grande?
How deep do footings, decks and water lines need to be in Pima County?
Drawn with the deepest nearby official value (0 in). Confirm Pima County’s own depth before you dig.
House or garage footing in Pima County: 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 | 12 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 Pima County?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Pima County never averages a low below freezing. 59 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 33.6 °F.
NOAA 1991–2020 climate normals, Kitt Peak station, 15.9 mi away, elevation 6,790 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 33.6 | 34.1 | 36.8 | 41.5 | 48.8 | 58.9 | 60.6 | 59.9 | 57.4 | 48.6 | 40.1 | 33.6 |
| High | 50.6 | 51.2 | 56.4 | 62.9 | 70.8 | 80.1 | 80.3 | 78.5 | 75.2 | 67.7 | 58.4 | 50.4 |
Pima County has more freezing nights than 25 of the 35 other Arizona places we track. The Arizona median is 12. Coldest: Flagstaff; mildest: Yuma.
What frost line depth do towns near Pima County use?
One official code near Pima County is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Casa Grande | 0 in | 54 mi away |
How likely is the soil in Pima County to heave?
USDA rates the sampled soil around Pima County as 100% none for frost action (main soils: Cellar, Anklam, Nahda).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Pima County at a glance
- Frost line depth
- No official local value
- Population (2023 est.)
- 1,063,162
- Mean annual temperature
- 55.7 °F
- ZIP codes (56)
- 85321 · 85341 · 85601 · 85602 · 85611 · 85614 · 85619 · 85622 · 85629 · 85633 · 85634 · 85637 · 85639 · 85641 · 85645 · 85653 · 85654 · 85658 · 85701 · 85704 · 85705 · 85706 · 85707 · 85708 · 85709 · 85710 · 85711 · 85712 · 85713 · 85714 · 85715 · 85716 · 85718 · 85719 · 85721 · 85723 · 85724 · 85726 · 85730 · 85734 · 85735 · 85736 · 85737 · 85739 · 85741 · 85742 · 85743 · 85745 · 85746 · 85747 · 85748 · 85749 · 85750 · 85755 · 85756 · 85757