Frost Line Depth in Baton Rouge, LA: Set Locally (Jefferson Parish: 12 in)

No official local value

No official frost line depth is published for Baton Rouge.

No verified code nearby. The only verified Louisiana code we read, Jefferson Parish’s, uses 12 in.

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, Lsu Ben-Hur Farm, 5.6 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

12 inJefferson Parish, the only verified Louisiana code
20nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Baton Rouge have an official frost line depth?

No adopted frost line depth found for Baton Rouge in its official documents (checked Oct 2026). No verified code lies near Baton Rouge; the only Louisiana code we verified, Jefferson Parish’s, uses 12 in. Ask the building department for Baton Rouge’s own number before you dig.

What frost line depth does Baton Rouge use for footings under Table R301.2(1)?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Baton Rouge building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 12 in (the deepest verified state value) unless the building department tells you otherwise.
Book the footing inspection before you pour concrete.

How deep do footings, decks and water lines need to be in Baton Rouge?

Drawn with the deepest Louisiana official value (12 in). Confirm Baton Rouge’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Baton Rouge: dig at least 12 in (30 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 12 in until Baton Rouge confirms its own
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 Baton Rouge?

Baton Rouge never averages a low below freezing. 20 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 40.2 °F.

NOAA 1991–2020 climate normals, Lsu Ben-Hur Farm station, 5.6 mi away, elevation 21 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	40.2	43.9	49.8	56.1	64.6	71.1	73	72.3	68	57.1	47.3	42.3
High	60.7	64.6	71.3	77.6	84.3	89.1	90.6	90.8	87.7	80.3	70.2	63.2

Baton Rouge has more freezing nights than 19 of the 33 other Louisiana places we track. The Louisiana median is 18. Coldest: Lincoln Parish; mildest: New Orleans.

How likely is the soil in Baton Rouge to heave?

None 100%

USDA rates the sampled soil around Baton Rouge as 100% none for frost action (main soils: Sharkey, Jeanerette, Commerce).

USDA NRCS soil survey, 18 sample points within 5 mi. Higher frost action means more risk of heave; see frost heave.

Baton Rouge at a glance

Frost line depth: No official local value
County: East Baton Rouge Parish
Population (2023 est.): 219,573
Mean annual temperature: 67.3 °F
ZIP codes (19): 70801 · 70802 · 70803 · 70805 · 70806 · 70807 · 70808 · 70809 · 70810 · 70811 · 70812 · 70813 · 70814 · 70815 · 70816 · 70819 · 70820 · 70825 · 70836