Frost Line Depth in Kansas City, Missouri

Kansas City’s adopted code
Checked Oct 2026
Sources

Verified

36in

91 cm · 3 ft

Set in the building code Kansas City has adopted.

Source and how we checked

Document: up.codes

Climate: 93 nights a year at or below 32 °F (NOAA 1991–2020, Kansas City Downtown Airport, 2.2 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

1 of 1nearby verified codes use the same depth
93nights a year at or below 32 °F
96%of nearby soil rated “high” for frost action (USDA)

How deep is the frost line in Kansas City?

Kansas City'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 Kansas City?

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

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

House or garage footing Deck footing Water service line Fence post

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

Minimum depths in Kansas City 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 Kansas City?

Average lows are at or below freezing from Dec to Feb. 93 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 22.2 °F.

NOAA 1991–2020 climate normals, Kansas City Downtown Airport station, 2.2 mi away, elevation 742 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	22.2	26.4	36.2	46.3	57.2	67.2	71.9	69.9	61	48.7	36.3	26.7
High	39.9	45.1	56.6	66.8	76.2	85.8	90.2	88.6	80.4	68.2	54.5	43.9

Kansas City has fewer freezing nights than 8 of the 11 other Missouri places we track. The Missouri median is 105. Coldest: Buchanan County; mildest: Camden County.

What frost line depth do towns near Kansas City use?

One official code near Kansas City is verified.

Official frost line depths near Kansas City
Place	Verified frost line	Distance
Independence	36 in	11 mi away

How likely is the soil in Kansas City to heave?

High 96%

USDA rates the sampled soil around Kansas City as 4% moderate, 96% high for frost action (main soils: Knox, Haynie, Harvester).

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 Kansas City?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Kansas City 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.

Kansas City at a glance

Frost line depth: 36 in
County: Jackson County
Population (2023 est.): 510,704
Mean annual temperature: 56.9 °F
ZIP codes (59): 64012 · 64053 · 64055 · 64064 · 64068 · 64079 · 64081 · 64082 · 64101 · 64102 · 64105 · 64106 · 64108 · 64109 · 64110 · 64111 · 64112 · 64113 · 64114 · 64116 · 64117 · 64118 · 64119 · 64120 · 64123 · 64124 · 64125 · 64126 · 64127 · 64128 · 64129 · 64130 · 64131 · 64132 · 64133 · 64134 · 64136 · 64137 · 64138 · 64139 · 64145 · 64146 · 64147 · 64149 · 64150 · 64151 · 64152 · 64153 · 64154 · 64155 · 64156 · 64157 · 64158 · 64161 · 64163 · 64164 · 64165 · 64166 · 64167