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

No official local value

No official frost line depth is published for Monroe.

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: 33 nights a year at or below 32 °F (NOAA 1991–2020, Monroe Regional Airport, 2.1 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

12 inJefferson Parish, the only verified Louisiana code
33nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Monroe have an official frost line depth?

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

What frost line depth does Monroe 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 Monroe 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 Monroe?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Monroe: 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 Monroe 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 Monroe?

Monroe never averages a low below freezing. 33 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 36.7 °F.

NOAA 1991–2020 climate normals, Monroe Regional Airport station, 2.1 mi away, elevation 79 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	36.7	40.2	47.2	54.2	63.1	70.1	72.5	71.4	65.5	53.7	43.9	38.6
High	57	61.1	69.1	76.8	84.4	90.5	93.2	93.6	88.7	78.8	67.3	59

Monroe has more freezing nights than 28 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 Monroe to heave?

None 100%

USDA rates the sampled soil around Monroe as 100% none for frost action (main soils: Sterlington, Portland, Perry).

USDA NRCS soil survey, 9 sample points within 2 mi. Higher frost action means more risk of heave; see frost heave.

Monroe at a glance

Frost line depth: No official local value
County: Ouachita Parish
Population (2023 est.): 46,616
Mean annual temperature: 65.7 °F
ZIP codes (5): 71201 · 71202 · 71203 · 71209 · 71212