Frost Line Depth in Johnson County, MO: Independence Requires 36 in

No official local value

No official frost line depth is published for Johnson County.

Nearby official codes require 36 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: 118 nights a year at or below 32 °F (NOAA 1991–2020, Warrensburg 4Nw, 3 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

36 in1 verified code within 38 mi
118nights a year at or below 32 °F
46%of nearby soil rated “moderate” for frost action (USDA)

Does Johnson County have an official frost line depth?

No adopted frost line depth found for Johnson County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 36 in. Use the deepest of them until the building department confirms Johnson County’s own number.

What frost line depth does Johnson County use for footings under Table R301.2(1)? Is it 36 in, like Independence?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Johnson County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 36 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 Johnson County?

Drawn with the deepest nearby official value (36 in). Confirm Johnson County’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

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

Using the nearby official value of 36 in until Johnson County confirms its own
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 Johnson County?

Average lows are at or below freezing from Dec to Mar. 118 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 18.4 °F.

NOAA 1991–2020 climate normals, Warrensburg 4nw station, 3 mi away, elevation 796 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	18.4	22.2	32	42.3	53.4	62.8	66.8	64.7	55.4	43.4	32.6	23.1
High	40.4	45.1	56.7	67.2	76.4	85	89.8	88.8	81.3	69.4	55.9	44.7

Johnson County has more freezing nights than 10 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 Johnson County use?

One official code near Johnson County is verified.

Official frost line depths near Johnson County
Place	Verified frost line	Distance
Independence	36 in	38 mi away

How likely is the soil in Johnson County to heave?

None 21%Moderate 46%High 32%

USDA rates the sampled soil around Johnson County as 21% none, 46% moderate, 32% high for frost action (main soils: Sampsel, Snead, Deepwater).

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

Johnson County at a glance

Frost line depth: No official local value
Population (2023 est.): 54,962
Mean annual temperature: 54.9 °F
ZIP codes (19): 64011 · 64019 · 64020 · 64037 · 64040 · 64061 · 64070 · 64076 · 64080 · 64093 · 64726 · 64733 · 64747 · 64761 · 65305 · 65332 · 65336 · 65351 · 65360