Frost Line Depth in Marietta, Georgia
- 4 verified codes nearby
- Checked Oct 2026
No official local value
No official frost line depth is published for Marietta.
Nearby official codes require 5–12 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: 63 nights a year at or below 32 °F (NOAA 1991–2020, Mableton 1 N, 7.2 mi).
Checked Oct 2026. Report a correction
Does Marietta have an official frost line depth?
No adopted frost line depth found for Marietta in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 5 to 12 in. Use the deepest of them until the building department confirms Marietta’s own number.
What frost line depth does Marietta use for footings under Table R301.2(1)? Is it 12 in, like Dunwoody?
How deep do footings, decks and water lines need to be in Marietta?
Drawn with the deepest nearby official value (12 in). Confirm Marietta’s own depth before you dig.
House or garage footing in Marietta: 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 Marietta?
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Average lows are at or below freezing from Jan. 63 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 31.7 °F.
NOAA 1991–2020 climate normals, Mableton 1 N station, 7.2 mi away, elevation 980 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 31.7 | 34.6 | 40.2 | 48.3 | 57.4 | 65.1 | 68.4 | 67.9 | 61.8 | 50.9 | 39.8 | 34.9 |
| High | 53.3 | 57.4 | 65.4 | 71.7 | 76.5 | 82.4 | 83.8 | 83.6 | 79.5 | 70.8 | 62.9 | 55.4 |
Marietta has more freezing nights than 52 of the 74 other Georgia places we track. The Georgia median is 51. Coldest: Habersham County; mildest: Glynn County.
What frost line depth do towns near Marietta use?
4 official codes near Marietta are verified; each links to its document.
| Place | Verified frost line | Distance |
|---|---|---|
| Dunwoody | 12 in | 13 mi away |
| Brookhaven | 12 in | 13 mi away |
| Stonecrest | 12 in | 30 mi away |
| Fayette County | 5 in | 37 mi away |
How likely is the soil in Marietta to heave?
USDA rates the sampled soil around Marietta as 100% none for frost action (main soils: Urban land, Cecil, Madison).
USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.
Marietta at a glance
- Frost line depth
- No official local value
- County
- Cobb County
- Population (2023 est.)
- 62,769
- Mean annual temperature
- 60.1 °F
- ZIP codes (12)
- 30008 · 30060 · 30062 · 30064 · 30066 · 30067 · 30068 · 30080 · 30090 · 30144 · 30152 · 30339