Frost Line Depth in Leesburg, VA: Nearby Codes Require 24 in

No official local value

No official frost line depth is published for Leesburg.

Nearby official codes require 24 in (3 verified codes).

Source and how we checked

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

Climate: 115 nights a year at or below 32 °F (NOAA 1991–2020, Purcellville, 8.4 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

24 in3 verified codes within 57 mi
115nights a year at or below 32 °F
61%of nearby soil rated “moderate” for frost action (USDA)

Does Leesburg have an official frost line depth?

No adopted frost line depth found for Leesburg in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 24 in. Use the deepest of them until the building department confirms Leesburg’s own number.

What frost line depth does Leesburg use for footings under Table R301.2(1)? Is it 24 in, like Fairfax County?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Leesburg building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 24 in (the deepest nearby 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 Leesburg?

Drawn with the deepest nearby official value (24 in). Confirm Leesburg’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Leesburg: dig at least 24 in (61 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 24 in until Leesburg confirms its own
Project	Depth	Rule
House or garage footing	24 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	24 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	30 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	24 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 Leesburg?

Average lows are at or below freezing from Dec to Feb. 115 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 24.5 °F.

NOAA 1991–2020 climate normals, Purcellville station, 8.4 mi away, elevation 510 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	24.5	25.9	32.3	42.2	51.6	61.1	65.5	63.9	56.1	44.3	34.5	28.4
High	41	44	52.6	64.5	72.9	81.4	86.4	84.7	77.8	66.3	54.9	44.7

Leesburg has more freezing nights than 18 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 Leesburg use?

3 official codes near Leesburg are verified; each links to its document.

Official frost line depths near Leesburg
Place	Verified frost line	Distance
Fairfax County	24 in	25 mi away
Alexandria	24 in	32 mi away
Shenandoah County	24 in	57 mi away

How likely is the soil in Leesburg to heave?

Moderate 61%High 32%

USDA rates the sampled soil around Leesburg as 8% low, 61% moderate, 32% high for frost action (main soils: Myersville, Manassas, Melvin).

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

Leesburg at a glance

Frost line depth: No official local value
County: Loudoun County
Population (2023 est.): 49,312
Mean annual temperature: 54.2 °F
ZIP codes (2): 20175 · 20176