Frost Line Depth in Evanston, IL: Nearby Codes Require 42 in

No official local value

No official frost line depth is published for Evanston.

Nearby official codes require 42 in (5 verified codes).

Source and how we checked

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

Climate: 128 nights a year at or below 32 °F (NOAA 1991–2020, Chicago Botanic Garden, 8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

42 in5 verified codes within 25 mi
128nights a year at or below 32 °F
48%of nearby soil rated “high” for frost action (USDA)

Does Evanston have an official frost line depth?

No adopted frost line depth found for Evanston in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 42 in. Use the deepest of them until the building department confirms Evanston’s own number.

What frost line depth does Evanston use for footings under Table R301.2(1)? Is it 42 in, like Glenview?

Call 811 (JULIE) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Evanston building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 42 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 Evanston?

Drawn with the deepest nearby official value (42 in). Confirm Evanston’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Evanston: dig at least 42 in (107 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 42 in until Evanston confirms its own
Project	Depth	Rule
House or garage footing	42 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	42 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	48 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	42 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 Evanston?

Average lows are at or below freezing from Dec to Mar. 128 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 16.3 °F.

NOAA 1991–2020 climate normals, Chicago Botanic Garden station, 8 mi away, elevation 630 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	16.3	19.1	28.2	37.6	47.6	57.3	63.4	62.3	54.7	42.7	32.5	22.3
High	32.3	36	45.8	56.8	68.2	78.4	83.5	82	75.2	62.8	49	37.5

Evanston has more freezing nights than 37 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 Evanston use?

5 official codes near Evanston are verified; each links to its document.

Official frost line depths near Evanston
Place	Verified frost line	Distance
Glenview	42 in	7 mi away
Palatine	42 in	19 mi away
Lombard	42 in	20 mi away
Hoffman Estates	42 in	24 mi away
Wheaton	42 in	25 mi away

How likely is the soil in Evanston to heave?

Low 36%Moderate 15%High 48%

USDA rates the sampled soil around Evanston as 36% low, 15% moderate, 48% high for frost action (main soils: Anthroportic Udorthents, Psamments, Elliott).

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

Evanston at a glance

Frost line depth: No official local value
County: Cook County
Population (2023 est.): 75,070
Mean annual temperature: 49.6 °F
ZIP codes (3): 60201 · 60202 · 60208