Frost Line Depth in Broomfield County, CO: Broomfield Requires 36 in

No official local value

No official frost line depth is published for Broomfield County.

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: 148 nights a year at or below 32 °F (NOAA 1991–2020, Northglenn, 4.3 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

36 in1 verified code within 0 mi
148nights a year at or below 32 °F
84%of nearby soil rated “low” for frost action (USDA)

Does Broomfield County have an official frost line depth?

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

What frost line depth does Broomfield County 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 Broomfield County 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 Broomfield County?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Broomfield County: 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 Broomfield County 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 Broomfield County?

Average lows are at or below freezing from Nov to Mar. 148 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 19 °F.

NOAA 1991–2020 climate normals, Northglenn station, 4.3 mi away, elevation 5,407 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	19	20.3	28.4	35.1	44.4	53.4	58.9	57.2	48.9	36.8	26.8	19.1
High	48	49.6	57.7	63.9	72.3	85.3	91.1	88.9	81.5	67.2	55.8	47.5

Broomfield County has fewer freezing nights than 12 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 Broomfield County use?

One official code near Broomfield County is verified.

Official frost line depths near Broomfield County
Place	Verified frost line	Distance
Broomfield	36 in	0 mi away

How likely is the soil in Broomfield County to heave?

Low 84%Moderate 16%

USDA rates the sampled soil around Broomfield County as 84% low, 16% moderate for frost action (main soils: Nunn, Ulm, Heldt).

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

Broomfield County at a glance

Frost line depth: No official local value
Population (2023 est.): 76,860
Mean annual temperature: 52.4 °F
ZIP codes (6): 80020 · 80021 · 80023 · 80026 · 80234 · 80516