Frost Line Depth in Rock Hill, SC: South Carolina Codes Range 0

No official local value

No official frost line depth is published for Rock Hill.

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: 51 nights a year at or below 32 °F (NOAA 1991–2020, Winthrop Univ, 0.8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0–12 inrange of verified South Carolina codes
51nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Rock Hill have an official frost line depth?

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

What frost line depth does Rock Hill 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 Rock Hill 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 Rock Hill?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Rock Hill: 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 Rock Hill 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 Rock Hill?

Rock Hill never averages a low below freezing. 51 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 32.6 °F.

NOAA 1991–2020 climate normals, Winthrop Univ station, 0.8 mi away, elevation 650 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	32.6	35	41.6	49.9	58.6	66.5	69.7	68.9	63	51.2	40.9	35.2
High	53.5	57.8	65.5	74.8	81.2	87.6	90.7	89	83.5	74	63.8	55.6

Rock Hill has fewer freezing nights than 7 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 Rock Hill to heave?

None 100%

USDA rates the sampled soil around Rock Hill as 100% none for frost action (main soils: Urban land, Cecil, Brewback).

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

Rock Hill at a glance

Frost line depth: No official local value
County: York County
Population (2023 est.): 75,654
Mean annual temperature: 62.1 °F
ZIP codes (3): 29730 · 29732 · 29733