Frost Line Depth in McKinney, TX: Nearby Codes Require 6 in

No official local value

No official frost line depth is published for McKinney.

Nearby official codes require 6 in (5 verified codes).

Source and how we checked

We searched this place’s own code and website and found no published frost line depth.

Climate: 45 nights a year at or below 32 °F (NOAA 1991–2020, Mckinney Municipalcipal Airport, 4.3 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

6 in5 verified codes within 28 mi
45nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does McKinney have an official frost line depth?

No adopted frost line depth found for McKinney in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 6 in. Use the deepest of them until the building department confirms McKinney’s own number.

What frost line depth does McKinney use for footings under Table R301.2(1)? Is it 6 in, like Allen?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the McKinney building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 6 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 McKinney?

Drawn with the deepest nearby official value (6 in). Confirm McKinney’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in McKinney: dig at least 12 in (30 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

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

McKinney never averages a low below freezing. 45 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 33.6 °F.

NOAA 1991–2020 climate normals, Mckinney Municipal Airport station, 4.3 mi away, elevation 586 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	33.6	36.3	45.3	52	62	69.6	72.5	71.3	64.9	53.8	44.2	36.7
High	56.4	59.9	69	76.3	83.2	90.4	94.2	94.6	87.3	78.7	66.7	58

McKinney has more freezing nights than 136 of the 168 other Texas places we track. The Texas median is 32. Coldest: Amarillo; mildest: Brownsville.

What frost line depth do towns near McKinney use?

5 official codes near McKinney are verified; each links to its document.

Official frost line depths near McKinney
Place	Verified frost line	Distance
Allen	6 in	6 mi away
Frisco	6 in	10 mi away
Richardson	6 in	16 mi away
Lewisville	6 in	21 mi away
Denton	6 in	28 mi away

How likely is the soil in McKinney to heave?

None 100%

USDA rates the sampled soil around McKinney as 100% none for frost action (main soils: Austin, Houston Black, Tinn).

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

McKinney at a glance

Frost line depth: No official local value
County: Collin County
Population (2023 est.): 213,509
Mean annual temperature: 64.9 °F
ZIP codes (6): 75069 · 75070 · 75071 · 75072 · 75407 · 75454