Frost Line Depth in Commerce City, CO: Broomfield Requires 36 in

No official local value

No official frost line depth is published for Commerce City.

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: 163 nights a year at or below 32 °F (NOAA 1991–2020, Brighton 3 Se, 4.7 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

36 in1 verified code within 14 mi
163nights a year at or below 32 °F
60%of nearby soil rated “moderate” for frost action (USDA)

Does Commerce City have an official frost line depth?

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

What frost line depth does Commerce City use for footings under Table R301.2(1)? Is it 36 in, like Broomfield?

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

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Commerce City: 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 Commerce City 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 Commerce City?

Average lows are at or below freezing from Nov to Mar. 163 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 16.1 °F.

NOAA 1991–2020 climate normals, Brighton 3 Se station, 4.7 mi away, elevation 5,016 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	16.1	18.5	26.7	33.9	43.2	52.4	58.2	56.4	47.4	35	25	16.3
High	44.4	45.9	55.9	62.9	71.9	84.1	90	87.6	79.8	65.9	53.3	44

Commerce City has fewer freezing nights than 9 of the 14 other Colorado places we track. The Colorado median is 176. Coldest: Eagle County; mildest: Littleton.

What frost line depth do towns near Commerce City use?

One official code near Commerce City is verified.

Official frost line depths near Commerce City
Place	Verified frost line	Distance
Broomfield	36 in	14 mi away

How likely is the soil in Commerce City to heave?

Low 40%Moderate 60%

USDA rates the sampled soil around Commerce City as 0% none, 40% low, 60% moderate for frost action (main soils: Ascalon, Truckton, Platner).

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

Commerce City at a glance

Frost line depth: No official local value
County: Adams County
Population (2023 est.): 68,245
Mean annual temperature: 50.6 °F
ZIP codes (6): 80022 · 80216 · 80229 · 80601 · 80603 · 80640