Frost Line Depth in Windsor County, Vermont

Vermont state rule
Checked Oct 2026
Sources

State-set value

60in

152 cm · 5 ft

60 in Under the Vermont State Code

Set by the state: Vermont Building Code §1809.5 (state code; covers public buildings incl. rental housing — not owner-occupied single-family homes).

Vermont’s state code covers public buildings and rental housing, not owner-occupied single-family homes. For your own home, ask the town.

Source and how we checked

Windsor County does not publish its own value; the state rule applies.

Document: up.codes

Climate: 172 nights a year at or below 32 °F (NOAA 1991–2020, Woodstock, 6.1 mi).

Checked Oct 2026. Report a correction

Footings Deck Water line Fence post

172nights a year at or below 32 °F
74%of nearby soil rated “moderate” for frost action (USDA)

How deep is the frost line in Windsor County?

Vermont's state building code requires foundations at least 60 in (152 cm, 5 ft) below finished grade for the buildings it covers (public buildings, including rental housing); owner-occupied single-family homes in Windsor County follow the town's own code, if it has one. Footings, piers and other permanent supports must reach at least this depth (IRC R403.1.4.1).

Who sets the frost line depth in Windsor County?

Vermont writes this depth into its statewide residential code, so Windsor County’s building department enforces the state’s number rather than setting its own. See how Vermont sets frost line depth.

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

House or garage footing Deck footing Water service line Fence post

House or garage footing in Windsor County: dig at least 60 in (152 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).

Minimum depths in Windsor County with a 60 in frost line
Project	Depth	Rule
House or garage footing	60 in	Below the frost line and at least 12 in deep (IRC R403.1.4)
Deck footing (attached)	60 in	Below the frost line and at least 12 in deep (IRC R507.3)
Water service line	66 in	6 in below the frost line and at least 12 in deep (IRC P2603.5)
Fence post bottom	60 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 Windsor County?

Average lows are at or below freezing from Nov to Apr. 172 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 7.3 °F.

NOAA 1991–2020 climate normals, Woodstock station, 6.1 mi away, elevation 600 ft.

Monthly temperatures as a table

°F	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Low	7.3	8.5	18.7	31.4	42.7	52.6	57.4	55.4	47.3	35.5	26.1	15.6
High	29.5	32.8	41	55	68.1	76.9	81.6	80.1	73	59.2	46.4	35.2

How likely is the soil in Windsor County to heave?

Low 21%Moderate 74%

USDA rates the sampled soil around Windsor County as 1% none, 21% low, 74% moderate, 4% high for frost action (main soils: Tunbridge, Berkshire, Lyman).

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 Windsor County?

Call 811 at least a few working days before you dig, so buried lines are marked.
Confirm the frost line depth with the Windsor County building department.
Ask whether your project needs a permit (decks, larger sheds and footings usually do).
Dig below 60 in unless the building department tells you otherwise.
Book the footing inspection before you pour concrete.

Windsor County at a glance

Frost line depth: 60 in Under the Vermont State Code
Population (2023 est.): 58,101
Mean annual temperature: 44.9 °F
ZIP codes (39): 05001 · 05009 · 05030 · 05031 · 05032 · 05034 · 05035 · 05037 · 05048 · 05052 · 05053 · 05055 · 05056 · 05059 · 05060 · 05062 · 05065 · 05067 · 05068 · 05071 · 05073 · 05084 · 05088 · 05089 · 05091 · 05142 · 05143 · 05148 · 05149 · 05150 · 05151 · 05153 · 05156 · 05161 · 05746 · 05758 · 05762 · 05767 · 05772