Frost Line Depth in West Haven, Connecticut
- Connecticut state rule
- Checked Oct 2026
- Sources
State-set value
42in
107 cm · 3 ft 6 in
42 in (Connecticut rule)
Set by the state: Connecticut State Building Code 2022 Table R301.2 (statewide).
Source and how we checked
West Haven does not publish its own value; the state rule applies.
Document: codes.iccsafe.org
Climate: 102 nights a year at or below 32 °F (NOAA 1991–2020, New Haven Tweed Airport, 4.2 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in West Haven?
Connecticut sets the frost footing depth for West Haven at 42 in (107 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 West Haven?
Connecticut writes this depth into its statewide residential code, so West Haven’s building department enforces the state’s number rather than setting its own. See how Connecticut sets frost line depth.
How deep do footings, decks and water lines need to be in West Haven?
House or garage footing in West Haven: dig at least 42 in (107 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 42 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 42 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 48 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 42 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 West Haven?
- J
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- A
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- J
- J
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- D
Average lows are at or below freezing from Dec to Mar. 102 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 23 °F.
NOAA 1991–2020 climate normals, New Haven Tweed Airport station, 4.2 mi away, elevation 3 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 23 | 23.9 | 30.1 | 39.3 | 49.4 | 59.3 | 65.7 | 64.7 | 57.3 | 45.5 | 35.9 | 28.9 |
| High | 38.1 | 40.2 | 47 | 57.8 | 67.7 | 76.4 | 82.1 | 81 | 74.7 | 63.8 | 53.4 | 43.7 |
West Haven has fewer freezing nights than 8 of the 10 other Connecticut places we track. The Connecticut median is 121. Coldest: Bristol; mildest: Bridgeport.
What frost line depth do towns near West Haven use?
One official code near West Haven is verified.
| Place | Verified frost line | Distance |
|---|---|---|
| Bristol | 42 in | 28 mi away |
How likely is the soil in West Haven to heave?
USDA rates the sampled soil around West Haven as 51% none, 47% moderate, 3% high for frost action (main soils: Urban land, Charlton, Woodbridge).
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 West Haven?
West Haven at a glance
- Frost line depth
- 42 in (Connecticut rule)
- County
- South Central Connecticut Planning Region
- Population (2023 est.)
- 54,790
- Mean annual temperature
- 52 °F
- ZIP codes (1)
- 06516