Frost Line Depth in Horry County, SC: South Carolina Codes Range 0

No official local value

No official frost line depth is published for Horry County.

No verified code nearby; verified South Carolina codes range 0–12 in.

Source and how we checked

We searched this place’s own code and website and found no published frost line depth.

Climate: 39 nights a year at or below 32 °F (NOAA 1991–2020, Conway, 7 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0–12 inrange of verified South Carolina codes
39nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Horry County have an official frost line depth?

No adopted frost line depth found for Horry County in its official documents (checked Oct 2026). No verified code lies near Horry County; the South Carolina codes we verified range from 0 to 12 in. Ask the building department for Horry County’s own number before you dig.

What frost line depth does Horry County 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 Horry County 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 Horry County?

Drawn with the deepest South Carolina official value (12 in). Confirm Horry County’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Horry County: 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 Horry County 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 Horry County?

Horry County never averages a low below freezing. 39 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 35.2 °F.

NOAA 1991–2020 climate normals, Conway station, 7 mi away, elevation 20 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	35.2	38.1	43.6	51.9	60.6	68.7	72.4	71.2	66	54.8	44.1	38.6
High	58.1	60.6	68	75.8	82.6	87.7	90.8	89.1	84.8	76.9	68.2	60.6

Horry County has fewer freezing nights than 10 of the 13 other South Carolina places we track. The South Carolina median is 53. Coldest: Laurens County; mildest: Beaufort County.

How likely is the soil in Horry County to heave?

None 100%

USDA rates the sampled soil around Horry County as 100% none for frost action (main soils: Bladen, Yonges, Eulonia).

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

Horry County at a glance

Frost line depth: No official local value
Population (2023 est.): 397,478
Mean annual temperature: 64.5 °F
ZIP codes (16): 29511 · 29526 · 29527 · 29544 · 29545 · 29566 · 29568 · 29569 · 29572 · 29575 · 29576 · 29577 · 29579 · 29581 · 29582 · 29588