Frost Line Depth in Barnstable Town, Massachusetts
- Barnstable Town’s adopted code
- Checked Oct 2026
- Sources
Verified
48in
122 cm · 4 ft
Set in the building code Barnstable Town has adopted.
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 100 nights a year at or below 32 °F (NOAA 1991–2020, Hyannis, 2.7 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Barnstable Town?
Barnstable Town's building authority sets the frost line depth at 48 in (122 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 Barnstable Town?
Massachusetts sets frost line depth in its state code, and Barnstable Town’s own document lists the value above. Barnstable County uses the same 48 in, so the depth does not change at the city limits. See how Massachusetts sets frost line depth.
How deep do footings, decks and water lines need to be in Barnstable Town?
House or garage footing in Barnstable Town: dig at least 48 in (122 cm). Below the frost line and at least 12 in deep (IRC R403.1.4).
| Project | Depth | Rule |
|---|---|---|
| House or garage footing | 48 in | Below the frost line and at least 12 in deep (IRC R403.1.4) |
| Deck footing (attached) | 48 in | Below the frost line and at least 12 in deep (IRC R507.3) |
| Water service line | 54 in | 6 in below the frost line and at least 12 in deep (IRC P2603.5) |
| Fence post bottom | 48 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 Barnstable Town?
- J
- F
- M
- A
- M
- J
- J
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- S
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- N
- D
Average lows are at or below freezing from Dec to Mar. 100 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 22.3 °F.
NOAA 1991–2020 climate normals, Hyannis station, 2.7 mi away, elevation 60 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 22.3 | 23.5 | 29.6 | 38.3 | 47.6 | 57 | 64.2 | 63.2 | 56.5 | 45.9 | 36.9 | 28.6 |
| High | 38.8 | 39.7 | 44.2 | 53.5 | 62.7 | 71.5 | 78.1 | 77 | 71.1 | 61.2 | 52.1 | 43.8 |
Barnstable Town has fewer freezing nights than 33 of the 38 other Massachusetts places we track. The Massachusetts median is 130. Coldest: Berkshire County; mildest: Malden.
How likely is the soil in Barnstable Town to heave?
USDA rates the sampled soil around Barnstable Town as 98% low, 2% moderate for frost action (main soils: Carver, Eastchop, Plymouth).
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 Barnstable Town?
Barnstable Town at a glance
- Frost line depth
- 48 in
- County
- Barnstable County
- Population (2023 est.)
- 49,709
- Mean annual temperature
- 50.3 °F
- ZIP codes (13)
- 02537 · 02601 · 02630 · 02632 · 02635 · 02637 · 02647 · 02648 · 02655 · 02668 · 02672 · 02673 · 02675