Frost Line Depth in Lancaster County, Nebraska

Lancaster County’s adopted code
Checked Oct 2026
Sources

Verified

36in

91 cm · 3 ft

Set in the building code Lancaster County has adopted.

Source and how we checked

Document: lancaster.ne.gov

Climate: 143 nights a year at or below 32 °F (NOAA 1991–2020, Lincoln Municipal Airport, 5.6 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

0 of 1nearby verified codes use the same depth
143nights a year at or below 32 °F
57%of nearby soil rated “high” for frost action (USDA)

How deep is the frost line in Lancaster County?

Lancaster County's building authority sets the frost line depth at 36 in (91 cm). Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).

Who sets the frost line depth in Lancaster County?

Nebraska leaves the frost line depth to each city or county, and Lancaster County fills it in when it adopts the residential code. The value above comes from Lancaster County’s own document on lancaster.ne.gov. See how Nebraska sets frost line depth.

How deep do footings, decks and water lines need to be in Lancaster County?

House or garage footing Deck footing Water service line Fence post

House or garage footing in Lancaster County: dig at least 36 in (91 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Minimum depths in Lancaster County with a 36 in frost line
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 Lancaster County?

Average lows are at or below freezing from Nov to Mar. 143 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 14.4 °F.

NOAA 1991–2020 climate normals, Lincoln Municipal Airport station, 5.6 mi away, elevation 1,190 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	14.4	18.4	28.7	39.2	51.2	62.1	66.7	64.1	54.3	41	28	18.2
High	35.6	40.6	53.6	64.8	75	85.2	89.4	87.2	80.1	66.6	51.7	39.4

Lancaster County has fewer freezing nights than 3 of the 7 other Nebraska places we track. The Nebraska median is 143. Coldest: Buffalo County; mildest: Douglas County.

What frost line depth do towns near Lancaster County use?

One official code near Lancaster County is verified.

Official frost line depths near Lancaster County
Place	Verified frost line	Distance
Sarpy County	42 in	38 mi away

How likely is the soil in Lancaster County to heave?

None 32%High 57%

USDA rates the sampled soil around Lancaster County as 32% none, 0% low, 11% moderate, 57% high for frost action (main soils: Urban land, Judson, Wymore).

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

How do you confirm the frost line before you dig in Lancaster County?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Lancaster County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 36 in unless the building department tells you otherwise.
Book the footing inspection before you pour concrete.

Lancaster County at a glance

Frost line depth: 36 in
Population (2023 est.): 326,716
Mean annual temperature: 52.3 °F
ZIP codes (44): 68017 · 68065 · 68301 · 68317 · 68333 · 68336 · 68339 · 68358 · 68366 · 68368 · 68372 · 68402 · 68404 · 68419 · 68423 · 68428 · 68430 · 68438 · 68461 · 68462 · 68465 · 68502 · 68503 · 68504 · 68505 · 68506 · 68507 · 68508 · 68510 · 68512 · 68514 · 68516 · 68517 · 68520 · 68521 · 68522 · 68523 · 68524 · 68526 · 68527 · 68528 · 68531 · 68532 · 68588