Frost Line Depth in Madison County, ID: Bingham County Requires 30 in

No official local value

No official frost line depth is published for Madison County.

Nearby official codes require 30 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: 184 nights a year at or below 32 °F (NOAA 1991–2020, Rexburg Byu Idaho, 6.7 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

30 in1 verified code within 54 mi
184nights a year at or below 32 °F
76%of nearby soil rated “high” for frost action (USDA)

Does Madison County have an official frost line depth?

No adopted frost line depth found for Madison County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 30 in. Use the deepest of them until the building department confirms Madison County’s own number.

What frost line depth does Madison County use for footings under Table R301.2(1)? Is it 30 in, like Bingham County?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Madison County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 30 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 Madison County?

Drawn with the deepest nearby official value (30 in). Confirm Madison County’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Madison County: dig at least 30 in (76 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 30 in until Madison County confirms its own
Project	Depth	Rule
House or garage footing	30 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	30 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	36 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	30 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 Madison County?

Average lows are at or below freezing from Nov to Mar. 184 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 14.2 °F.

NOAA 1991–2020 climate normals, Rexburg Byu Idaho station, 6.7 mi away, elevation 5,005 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	14.2	16.9	26	33	41	47.1	52	50.2	42.6	33.1	23.7	15.1
High	29.5	34.1	45.8	56.1	66	75	85	84.1	74	58.2	42.1	30.1

Madison County has more freezing nights than 13 of the 13 other Idaho places we track. The Idaho median is 132. Coldest: Madison County; mildest: Canyon County.

What frost line depth do towns near Madison County use?

One official code near Madison County is verified.

Official frost line depths near Madison County
Place	Verified frost line	Distance
Bingham County	30 in	54 mi away

How likely is the soil in Madison County to heave?

Moderate 24%High 76%

USDA rates the sampled soil around Madison County as 24% moderate, 76% high for frost action (main soils: Rexburg, Ririe, Panmod).

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

Madison County at a glance

Frost line depth: No official local value
Population (2023 est.): 54,547
Mean annual temperature: 44.8 °F
ZIP codes (8): 83434 · 83436 · 83440 · 83443 · 83445 · 83448 · 83451 · 83460