Frost Line Depth in Mesa, AZ: Casa Grande Requires 0 in

No official local value

No official frost line depth is published for Mesa.

Nearby official codes require 0 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: 11 nights a year at or below 32 °F (NOAA 1991–2020, E Mesa, 4.4 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 in1 verified code within 34 mi
11nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Mesa have an official frost line depth?

No adopted frost line depth found for Mesa in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 0 in. Use the deepest of them until the building department confirms Mesa’s own number.

What frost line depth does Mesa use for footings under Table R301.2(1)? Is it 0 in, like Casa Grande?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Mesa building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 0 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 Mesa?

Drawn with the deepest nearby official value (0 in). Confirm Mesa’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Mesa: 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 0 in until Mesa 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 Mesa?

Mesa never averages a low below freezing. 11 nights a year reach 32 °F or colder; Dec is coldest, with an average low of 40.1 °F.

NOAA 1991–2020 climate normals, E Mesa station, 4.4 mi away, elevation 1,518 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	41	42.7	47.6	53.3	61.6	70.7	78.9	78.4	71.4	59.1	47.6	40.1
High	67.5	70.1	77.2	85.2	94.4	104.1	105.9	104.6	100.2	89.5	76.8	66.1

Mesa has fewer freezing nights than 19 of the 35 other Arizona places we track. The Arizona median is 12. Coldest: Flagstaff; mildest: Yuma.

What frost line depth do towns near Mesa use?

One official code near Mesa is verified.

Official frost line depths near Mesa
Place	Verified frost line	Distance
Casa Grande	0 in	34 mi away

How likely is the soil in Mesa to heave?

None 100%

USDA rates the sampled soil around Mesa as 100% none for frost action (main soils: Gilman, Mohall, Contine).

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

Mesa at a glance

Frost line depth: No official local value
County: Maricopa County
Population (2023 est.): 511,648
Mean annual temperature: 72.2 °F
ZIP codes (19): 85120 · 85201 · 85202 · 85203 · 85204 · 85205 · 85206 · 85207 · 85208 · 85209 · 85210 · 85212 · 85213 · 85215 · 85234 · 85256 · 85257 · 85281 · 85282