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

No official local value

No official frost line depth is published for Marana.

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: 67 nights a year at or below 32 °F (NOAA 1991–2020, Catalina Sp, 12.4 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 in1 verified code within 48 mi
67nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Marana have an official frost line depth?

No adopted frost line depth found for Marana 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 Marana’s own number.

What frost line depth does Marana 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 Marana 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 Marana?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Marana: 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 Marana 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 Marana?

Average lows are at or below freezing from Dec to Feb. 67 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 30.6 °F.

NOAA 1991–2020 climate normals, Catalina Sp station, 12.4 mi away, elevation 2,707 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	30.6	32	36.4	42.6	50.5	59.5	70.7	68.8	61.8	48.2	37.5	31
High	67	68.1	74.8	82.1	90.8	100.8	99.7	98.2	95.5	86.7	75.8	66.3

Marana has more freezing nights than 26 of the 35 other Arizona places we track. The Arizona median is 12. Coldest: Flagstaff; mildest: Yuma.

What frost line depth do towns near Marana use?

One official code near Marana is verified.

Official frost line depths near Marana
Place	Verified frost line	Distance
Casa Grande	0 in	48 mi away

How likely is the soil in Marana to heave?

None 100%

USDA rates the sampled soil around Marana as 100% none for frost action (main soils: Hayhook, Pinaleno, Gravelly alluvial land).

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

Marana at a glance

Frost line depth: No official local value
County: Pima County
Population (2023 est.): 58,430
Mean annual temperature: 65.7 °F
ZIP codes (6): 85653 · 85658 · 85741 · 85742 · 85743 · 85755