Frost Line Depth in Hempstead, NY: Mount Vernon Requires 42 in

No official local value

No official frost line depth is published for Hempstead.

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: 83 nights a year at or below 32 °F (NOAA 1991–2020, Mineola, 2 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

42 in1 verified code within 18 mi
83nights a year at or below 32 °F
92%of nearby soil rated “moderate” for frost action (USDA)

Does Hempstead have an official frost line depth?

No adopted frost line depth found for Hempstead 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 Hempstead’s own number.

What frost line depth does Hempstead 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 Hempstead 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 Hempstead?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Hempstead: 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 Hempstead 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 Hempstead?

Average lows are at or below freezing from Jan to Feb. 83 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 27.2 °F.

NOAA 1991–2020 climate normals, Mineola station, 2 mi away, elevation 96 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	27.2	28.2	34.5	43.3	52.2	61.5	67.7	66.1	59.8	49.2	39.8	32.6
High	41.6	44.1	51.1	62.1	71.9	80.9	86.5	84.5	77.5	66.7	55.9	46.5

Hempstead has fewer freezing nights than 61 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 Hempstead use?

One official code near Hempstead is verified.

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

How likely is the soil in Hempstead to heave?

Moderate 92%

USDA rates the sampled soil around Hempstead as 8% low, 92% moderate for frost action (main soils: Riverhead, Hempstead, Mineola).

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

Hempstead at a glance

Frost line depth: No official local value
County: Nassau County
Population (2023 est.): 58,225
Mean annual temperature: 55.5 °F
ZIP codes (2): 11550 · 11553