Frost Line Depth in Leominster, Massachusetts
- Leominster’s adopted code
- Checked Oct 2026
- Sources
Verified
48in
122 cm · 4 ft
Set in the building code Leominster has adopted.
Source and how we checked
We searched this place’s own code and website and found no published frost line depth.
Climate: 137 nights a year at or below 32 °F (NOAA 1991–2020, Fitchburg Municipal Airport, 2.3 mi).
Checked Oct 2026. Report a correction
How deep is the frost line in Leominster?
Leominster'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 Leominster?
Massachusetts sets frost line depth in its state code, and Leominster’s own document lists the value above. Worcester 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 Leominster?
House or garage footing in Leominster: 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 Leominster?
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Average lows are at or below freezing from Nov to Mar. 137 nights a year reach 32 °F or colder; Jan is coldest, with an average low of 15.6 °F.
NOAA 1991–2020 climate normals, Fitchburg Municipal Airport station, 2.3 mi away, elevation 348 ft.
Monthly temperatures as a table
| °F | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low | 15.6 | 17 | 25.2 | 35.4 | 46.1 | 55.9 | 61.5 | 59.6 | 51.4 | 39.5 | 30.2 | 21.9 |
| High | 34.2 | 37.3 | 45.4 | 58.4 | 69.5 | 78 | 83.4 | 81.7 | 74.2 | 61.8 | 50.1 | 39.7 |
Leominster has more freezing nights than 22 of the 38 other Massachusetts places we track. The Massachusetts median is 130. Coldest: Berkshire County; mildest: Malden.
How likely is the soil in Leominster to heave?
USDA rates the sampled soil around Leominster as 2% none, 73% moderate, 25% high for frost action (main soils: Paxton, Woodbridge, Ridgebury).
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 Leominster?
Leominster at a glance
- Frost line depth
- 48 in
- County
- Worcester County
- Population (2023 est.)
- 43,627
- Mean annual temperature
- 48.9 °F
- ZIP codes (2)
- 01420 · 01453