Frost Line Depth in Logan, Utah
- Logan’s adopted code
- Checked Oct 2026
- Sources
Verified
30in
76 cm · 2 ft 6 in
Set in the building code Logan has adopted.
Source and how we checked
Document: loganutah.gov
Climate: 166 nights a year at or below 32 °F (NOAA 1991–2020, Logan Radio Kvnu, 0.8 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Logan?
Logan's building authority sets the frost line depth at 30 in (76 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 Logan?
Utah leaves the frost line depth to each city or county, and Logan fills it in when it adopts the residential code. The value above comes from Logan’s own document on loganutah.gov. See how Utah sets frost line depth.
How deep do footings, decks and water lines need to be in Logan?
House or garage footing in Logan: 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 Logan?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Nov to Mar. 166 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 13.9 °F.
NOAA 1991–2020 climate normals, Logan Radio Kvnu station, 0.8 mi away, elevation 4,475 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 13.9 | 17.4 | 26.9 | 33.7 | 41.5 | 48.1 | 55 | 53.1 | 44.1 | 33.1 | 24.4 | 15.5 |
| High | 31.9 | 36.9 | 49.9 | 58.9 | 68.6 | 79.1 | 89.1 | 87.6 | 77.5 | 63.1 | 47.4 | 34 |
Logan has more freezing nights than 20 of the 25 other Utah places we track. The Utah median is 118. Coldest: Summit County; mildest: St. George.
What frost line depth do towns near Logan use?
4 official codes near Logan are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Ogden | 30 in | 36 mi away |
| Box Elder County | 30 in | 63 mi away |
| Salt Lake City | 30 in | 67 mi away |
| Millcreek | 30 in | 73 mi away |
How likely is the soil in Logan to heave?
USDA rates the sampled soil around Logan as 66% moderate, 34% high for frost action (main soils: Airport, Millville, Steed).
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 Logan?
Logan at a glance
- Frost line depth
- 30 in
- County
- Cache County
- Population (2023 est.)
- 55,250
- Mean annual temperature
- 47.1 °F
- ZIP codes (5)
- 84321 · 84322 · 84335 · 84339 · 84341