Hampton, VA Frost Line Depth: 12 in

Verified

12in

30 cm · 1 ft

Set in the building code Hampton has adopted.

Source and how we checked

Document: hampton.gov

Climate: 52 nights a year at or below 32 °F (NOAA 1991–2020, Langley Afb, 3.8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 of 1nearby verified codes use the same depth
52nights a year at or below 32 °F
79%of nearby soil rated “low” for frost action (USDA)

How deep is the frost line in Hampton?

Hampton's building authority sets the frost line depth at 12 in (30 cm). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).

Who sets the frost line depth in Hampton?

Virginia leaves the frost line depth to each city or county, and Hampton fills it in when it adopts the residential code. The value above comes from Hampton’s own document on hampton.gov. See how Virginia sets frost line depth.

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

House or garage footing Deck footing Water service line Fence post

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

Minimum depths in Hampton with a 12 in frost line
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 Hampton?

Hampton never averages a low below freezing. 52 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 32.1 °F.

NOAA 1991–2020 climate normals, Langley Afb station, 3.8 mi away, elevation 10 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	32.1	33.8	39.8	48.6	58	67.1	71.2	70.5	65	52.9	41.9	35.5
High	49	51.5	58.1	67.6	75.5	82.9	87.3	85.1	79.4	69.7	60.2	52.2

Hampton has fewer freezing nights than 20 of the 22 other Virginia places we track. The Virginia median is 94. Coldest: Shenandoah County; mildest: Norfolk.

What frost line depth do towns near Hampton use?

One official code near Hampton is verified.

Official frost line depths near Hampton
Place	Verified frost line	Distance
Henrico County	18 in	61 mi away

How likely is the soil in Hampton to heave?

None 21%Low 79%

USDA rates the sampled soil around Hampton as 21% none, 79% low for frost action (main soils: Altavista, Beaches, Tomotley).

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

How do you confirm the frost line before you dig in Hampton?

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

Hampton at a glance

Frost line depth: 12 in
County: Hampton city
Population (2023 est.): 137,098
Mean annual temperature: 59.8 °F
ZIP codes (12): 23605 · 23607 · 23651 · 23661 · 23663 · 23664 · 23665 · 23666 · 23667 · 23668 · 23669 · 23681