Frost Line Depth in Mercer County, OH: Springfield Requires 32 in

No official local value

No official frost line depth is published for Mercer County.

Nearby official codes require 32 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: 116 nights a year at or below 32 °F (NOAA 1991–2020, Celina 3 Ne, 5.5 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

32 in1 verified code within 61 mi
116nights a year at or below 32 °F
97%of nearby soil rated “high” for frost action (USDA)

Does Mercer County have an official frost line depth?

No adopted frost line depth found for Mercer County in its official documents (checked Oct 2026). The nearest official values, from codes we verified, are 32 in. Use the deepest of them until the building department confirms Mercer County’s own number.

What frost line depth does Mercer County use for footings under Table R301.2(1)? Is it 32 in, like Springfield?

Call 811 (OUPS (Ohio811)) at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Mercer County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 32 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 Mercer County?

Drawn with the deepest nearby official value (32 in). Confirm Mercer County’s own depth before you dig.

House or garage footing Deck footing Water service line Fence post

House or garage footing in Mercer County: dig at least 32 in (81 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Using the nearby official value of 32 in until Mercer County confirms its own
Project	Depth	Rule
House or garage footing	32 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	32 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	38 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	32 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 Mercer County?

Average lows are at or below freezing from Dec to Mar. 116 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 18.7 °F.

NOAA 1991–2020 climate normals, Celina 3 Ne station, 5.5 mi away, elevation 866 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	18.7	21.5	29.7	39.7	51.1	60.1	63	60.9	54.2	43.7	33.1	24.3
High	33.7	37.9	48.8	62.7	73.1	81	83.7	82.2	77.3	64.7	50.1	38.3

Mercer County has fewer freezing nights than 40 of the 80 other Ohio places we track. The Ohio median is 116. Coldest: Geauga County; mildest: Euclid.

What frost line depth do towns near Mercer County use?

One official code near Mercer County is verified.

Official frost line depths near Mercer County
Place	Verified frost line	Distance
Springfield	32 in	61 mi away

How likely is the soil in Mercer County to heave?

High 97%

USDA rates the sampled soil around Mercer County as 3% moderate, 97% high for frost action (main soils: Pewamo, Blount, Minster).

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

Mercer County at a glance

Frost line depth: No official local value
Population (2023 est.): 42,439
Mean annual temperature: 51.4 °F
ZIP codes (18): 45310 · 45388 · 45822 · 45826 · 45828 · 45845 · 45846 · 45860 · 45862 · 45865 · 45866 · 45869 · 45882 · 45883 · 45885 · 45887 · 45894 · 45898