Frost Line Depth in Reading, PA: Philadelphia Requires 30 in

No official local value

No official frost line depth is published for Reading.

Nearby official codes require 30 in (1 verified code).

Source and how we checked

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

Climate: 107 nights a year at or below 32 °F (NOAA 1991–2020, Reading Spaatz Fld, 2.9 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

30 in1 verified code within 48 mi
107nights a year at or below 32 °F
60%of nearby soil rated “moderate” for frost action (USDA)

Does Reading have an official frost line depth?

No adopted frost line depth found for Reading in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 30 in. Use the deepest of them until the building department confirms Reading’s own number.

What frost line depth does Reading use for footings under Table R301.2(1)? Is it 30 in, like Philadelphia?

Call 811 (PA One Call) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Reading building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 30 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 Reading?

Drawn with the deepest nearby official value (30 in). Confirm Reading’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Reading: dig at least 30 in (76 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 30 in until Reading confirms its own
Project	Depth	Rule
House or garage footing	30 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	30 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	36 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	30 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 Reading?

Average lows are at or below freezing from Dec to Mar. 107 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 23 °F.

NOAA 1991–2020 climate normals, Reading Spaatz Fld station, 2.9 mi away, elevation 341 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	23	24.4	31.9	41.7	51.5	61.2	65.8	64.1	56.6	45	35.4	28
High	38.6	41.9	51	63.4	73.5	82	86.5	84.4	77.1	65.4	53.8	43.4

Reading has fewer freezing nights than 4 of the 4 other Pennsylvania places we track. The Pennsylvania median is 134. Coldest: Mercer County; mildest: Reading.

What frost line depth do towns near Reading use?

One official code near Reading is verified.

Official frost line depths near Reading
Place	Verified frost line	Distance
Philadelphia	30 in	48 mi away

How likely is the soil in Reading to heave?

None 37%Moderate 60%

USDA rates the sampled soil around Reading as 37% none, 60% moderate, 2% high for frost action (main soils: Urban land, Hazleton, Gladstone).

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

Reading at a glance

Frost line depth: No official local value
County: Berks County
Population (2023 est.): 94,903
Mean annual temperature: 53.7 °F
ZIP codes (8): 19601 · 19602 · 19604 · 19605 · 19606 · 19607 · 19610 · 19611