Frost Line Depth in Union County, OH: Nearby Codes Require 32 in

No official local value

No official frost line depth is published for Union County.

Nearby official codes require 32 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: 114 nights a year at or below 32 °F (NOAA 1991–2020, Marysville, 8.8 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

32 in2 verified codes within 34 mi
114nights a year at or below 32 °F
95%of nearby soil rated “high” for frost action (USDA)

Does Union County have an official frost line depth?

No adopted frost line depth found for Union 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 Union County’s own number.

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

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 Union 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 Union County?

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Union 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 Union 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 Union County?

Average lows are at or below freezing from Dec to Mar. 114 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 20.6 °F.

NOAA 1991–2020 climate normals, Marysville station, 8.8 mi away, elevation 970 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	20.6	22.9	30.8	41	51.8	60.8	64.4	62.4	54.7	43.8	33.7	26.1
High	35	38.9	49.6	63	73.6	81.7	84.9	83.5	77.5	65	50.9	39.6

Union County has fewer freezing nights than 52 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 Union County use?

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

Official frost line depths near Union County
Place	Verified frost line	Distance
Columbus	32 in	30 mi away
Springfield	32 in	34 mi away

How likely is the soil in Union County to heave?

High 95%

USDA rates the sampled soil around Union County as 5% moderate, 95% high for frost action (main soils: Blount, Pewamo, Glynwood).

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

Union County at a glance

Frost line depth: No official local value
Population (2023 est.): 69,637
Mean annual temperature: 52.4 °F
ZIP codes (21): 43007 · 43015 · 43016 · 43017 · 43029 · 43036 · 43040 · 43045 · 43060 · 43061 · 43064 · 43067 · 43077 · 43084 · 43302 · 43319 · 43340 · 43342 · 43344 · 43345 · 43358