Frost Line Depth in Sierra Vista, AZ: Cochise County Requires 0 in

No official local value

No official frost line depth is published for Sierra Vista.

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: 45 nights a year at or below 32 °F (NOAA 1991–2020, Sierra Vista, 2.8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 in1 verified code within 37 mi
45nights a year at or below 32 °F
100%of nearby soil rated “none” for frost action (USDA)

Does Sierra Vista have an official frost line depth?

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

What frost line depth does Sierra Vista use for footings under Table R301.2(1)? Is it 0 in, like Cochise County?

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

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Sierra Vista: 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 Sierra Vista 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 Sierra Vista?

Average lows are at or below freezing from Dec to Jan. 45 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 29.5 °F.

NOAA 1991–2020 climate normals, Sierra Vista station, 2.8 mi away, elevation 4,606 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	29.5	32.6	37.5	42.8	50.4	59.6	62.5	61.5	56.7	47.1	36.8	29.5
High	61.3	64.4	70.5	77.5	85	93.9	91.5	89.5	86.8	80	70	61.6

Sierra Vista has more freezing nights than 24 of the 35 other Arizona places we track. The Arizona median is 12. Coldest: Flagstaff; mildest: Yuma.

What frost line depth do towns near Sierra Vista use?

One official code near Sierra Vista is verified.

Official frost line depths near Sierra Vista
Place	Verified frost line	Distance
Cochise County	0 in	37 mi away

How likely is the soil in Sierra Vista to heave?

None 100%

USDA rates the sampled soil around Sierra Vista as 100% none for frost action (main soils: Terrarossa, White House, Courtland).

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

Sierra Vista at a glance

Frost line depth: No official local value
County: Cochise County
Population (2023 est.): 44,431
Mean annual temperature: 61.6 °F
ZIP codes (4): 85611 · 85613 · 85635 · 85650