Frost Line Depth in Champaign, IL: Nearby Codes Require 36

No official local value

No official frost line depth is published for Champaign.

Nearby official codes require 36–40 in (2 verified codes).

Source and how we checked

We searched this place’s own code and website and found no published frost line depth.

Climate: 120 nights a year at or below 32 °F (NOAA 1991–2020, Champaign 3S, 2.8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

36–40 in2 verified codes within 44 mi
120nights a year at or below 32 °F
56%of nearby soil rated “moderate” for frost action (USDA)

Does Champaign have an official frost line depth?

No adopted frost line depth found for Champaign in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 36 to 40 in. Use the deepest of them until the building department confirms Champaign’s own number.

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

Call 811 (JULIE) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Champaign building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 40 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 Champaign?

Drawn with the deepest nearby official value (40 in). Confirm Champaign’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Champaign: dig at least 40 in (102 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 40 in until Champaign confirms its own
Project	Depth	Rule
House or garage footing	40 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	40 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	46 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	40 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 Champaign?

Average lows are at or below freezing from Dec to Mar. 120 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 17.9 °F.

NOAA 1991–2020 climate normals, Champaign 3s station, 2.8 mi away, elevation 721 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	17.9	21.2	31.2	41.6	52.7	62.1	65.2	63.6	55.6	43.9	32.2	23.6
High	33.5	38.4	50.4	63.1	73.8	82.7	85.2	84	78.8	65.8	50.7	38.5

Champaign has fewer freezing nights than 48 of the 71 other Illinois places we track. The Illinois median is 127. Coldest: Hoffman Estates; mildest: Madison County.

What frost line depth do towns near Champaign use?

2 official codes near Champaign are verified; each links to its document.

Official frost line depths near Champaign
Place	Verified frost line	Distance
Decatur	36 in	39 mi away
Bloomington	40 in	44 mi away

How likely is the soil in Champaign to heave?

Moderate 56%High 44%

USDA rates the sampled soil around Champaign as 56% moderate, 44% high for frost action (main soils: Flanagan, Catlin, Drummer).

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

Champaign at a glance

Frost line depth: No official local value
County: Champaign County
Population (2023 est.): 89,189
Mean annual temperature: 52.3 °F
ZIP codes (5): 61801 · 61802 · 61820 · 61821 · 61822