Frost Line Depth in Valley Stream, NY: Mount Vernon Requires 42 in

No official local value

No official frost line depth is published for Valley Stream.

Nearby official codes require 42 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: 74 nights a year at or below 32 °F (NOAA 1991–2020, New York Jfk International Airport, 3.5 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

42 in1 verified code within 18 mi
74nights a year at or below 32 °F
68%of nearby soil rated “moderate” for frost action (USDA)

Does Valley Stream have an official frost line depth?

No adopted frost line depth found for Valley Stream in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 42 in. Use the deepest of them until the building department confirms Valley Stream’s own number.

What frost line depth does Valley Stream use for footings under Table R301.2(1)? Is it 42 in, like Mount Vernon?

Call 811 (Dig Safely New York) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Valley Stream building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 42 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 Valley Stream?

Drawn with the deepest nearby official value (42 in). Confirm Valley Stream’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Valley Stream: dig at least 42 in (107 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 42 in until Valley Stream confirms its own
Project	Depth	Rule
House or garage footing	42 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	42 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	48 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	42 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 Valley Stream?

Average lows are at or below freezing from Dec to Feb. 74 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 26.2 °F.

NOAA 1991–2020 climate normals, New York Jfk International Airport station, 3.5 mi away, elevation 11 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	26.2	27.4	33.6	42.9	52.5	62.4	68.7	67.8	61	49.8	39.8	32
High	39.5	41.7	48.7	58.8	68.4	78	83.6	82.2	75.8	64.7	53.8	44.5

Valley Stream has fewer freezing nights than 64 of the 67 other New York places we track. The New York median is 141. Coldest: Franklin County; mildest: Kings County.

What frost line depth do towns near Valley Stream use?

One official code near Valley Stream is verified.

Official frost line depths near Valley Stream
Place	Verified frost line	Distance
Mount Vernon	42 in	18 mi away

How likely is the soil in Valley Stream to heave?

Low 32%Moderate 68%

USDA rates the sampled soil around Valley Stream as 32% low, 68% moderate for frost action (main soils: Riverhead, Udipsamments, Flatbush).

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

Valley Stream at a glance

Frost line depth: No official local value
County: Nassau County
Population (2023 est.): 40,007
Mean annual temperature: 54.3 °F
ZIP codes (4): 11557 · 11563 · 11580 · 11581