Independence, MO Frost Line Depth: 36 in

Verified

36in

91 cm · 3 ft

Set in the building code Independence has adopted.

Source and how we checked

Document: independencemo.gov

Climate: 112 nights a year at or below 32 °F (NOAA 1991–2020, Independence, 2.3 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

112nights a year at or below 32 °F
99%of nearby soil rated “high” for frost action (USDA)

How deep is the frost line in Independence?

Independence's building authority sets the frost line depth at 36 in (91 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 Independence?

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

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Independence: dig at least 36 in (91 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Minimum depths in Independence with a 36 in frost line
Project	Depth	Rule
House or garage footing	36 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	36 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	42 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	36 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 Independence?

Average lows are at or below freezing from Dec to Feb. 112 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 19.2 °F.

NOAA 1991–2020 climate normals, Independence station, 2.3 mi away, elevation 985 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	19.2	23.1	32.6	42.6	53.7	63.5	67.8	65.7	57	45.1	33.5	23.9
High	37.6	43	54.5	64.6	73.9	82.9	86.9	86	78.4	66.5	53	41.8

Independence has more freezing nights than 9 of the 11 other Missouri places we track. The Missouri median is 105. Coldest: Buchanan County; mildest: Camden County.

How likely is the soil in Independence to heave?

High 99%

USDA rates the sampled soil around Independence as 1% moderate, 99% high for frost action (main soils: Knox, Kennebec, Sibley).

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 Independence?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Independence building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 36 in unless the building department tells you otherwise.
Book the footing inspection before you pour concrete.

Independence at a glance

Frost line depth: 36 in
County: Jackson County
Population (2023 est.): 120,922
Mean annual temperature: 54 °F
ZIP codes (13): 64015 · 64016 · 64050 · 64052 · 64053 · 64054 · 64055 · 64056 · 64057 · 64058 · 64064 · 64133 · 64161