Home / Frost line depth / Oklahoma
Frost data
Frost line depth in Oklahoma
The short answer
Oklahoma publishes no single statewide frost depth. Oklahoma has no statewide amendment on record for frost depth or water line depth, so both come from the municipality that issues your permit. Footings have to bear below that depth, and a water service line has to sit at least six inches below it and at least twelve inches down, which in Oklahoma works out to a minimum of 12 inches. Source: Oklahoma Uniform Building Code Commission (OUBCC).
The Oklahoma Uniform Building Code Commission adopts model codes for the state, and we found no state amendment setting a frost depth or altering the water service burial rule. That leaves the model-code language in force and the frost figure itself in the hands of the adopting municipality.
Published Oklahoma figures are unusually hard to find. The Village, an incorporated city inside the Oklahoma City metro, fills its Table R301.2(1) with 18 inches, and that is the one number we could read in an official document. Oklahoma City's and Tulsa's own figures we could not verify against anything readable, so this page does not print them. That is a deliberate gap rather than an oversight: a wrong frost depth on a plumbing site is worse than a missing one.
What Oklahoma does have is a serious freeze profile for a southern plains state. Oklahoma City averages about 15 nights a year below 20°F and its median first freeze is 2 November, which is earlier than Kentucky and barely later than southern Illinois.
By jurisdiction
What Oklahoma jurisdictions publish
With no statewide figure, these are the depths real building departments have published.
| Jurisdiction | Frost depth | Source |
|---|---|---|
| City of The Village, OK (Oklahoma County) | 18 in | City of The Village, OK, Chapter 6 buildings and building regulation… |
These are the jurisdictions whose published figure we could read and verify, so it isn’t a complete list of Oklahoma building departments. Yours may differ, and yours is the one that governs your permit.
The weather behind the number
When it freezes in Oklahoma
NOAA 1991 to 2020 normals at representative stations across the state.
| Station | First 32°F | First 28°F | First 20°F | Last 32°F | Nights below 20°F |
|---|---|---|---|---|---|
| BARTLESVILLE F P FLD | October 21 | October 31 | November 19 | April 12 | 30 |
| CLINTON SHERMAN AP | November 4 | November 12 | December 4 | April 5 | 15 |
| GOODWELL 2 SE | October 24 | November 1 | November 18 | April 18 | 42 |
| MUSKOGEE DAVIS FLD | November 2 | November 12 | December 6 | April 2 | 16 |
| OKLAHOMA CITY POST AP | November 4 | November 13 | December 3 | April 2 | 17 |
| STILLWATER 5 WNW | October 27 | November 4 | November 23 | April 12 | 30 |
Dates are the median: half of years cross that threshold earlier, half later. “no normal” means NOAA publishes none for that station, which at a warm station means it does not reliably get that cold. Source: NOAA NCEI U.S. Climate Normals, 1991-2020, retrieved 2026-09-09.
Across all 193 Oklahoma stations with published normals, the median first 32°F night falls around November 1 and the median station records 20 nights a year below 20°F, which is the coldest threshold NOAA counts and a decent proxy for a hard freeze rather than a light frost. The state’s spread runs from BOISE CITY 2 E, where the median first freeze is October 17, to HUGO at November 15.
The median Oklahoma station crosses freezing on 1 November and logs about 20 nights a year below 20°F. The panhandle is a different climate from the southeast: Boise City reaches its median first freeze on 17 October, Hugo near the Red River on 15 November. Oklahoma City sits between them, and its combination of real freezes and southern-plains housing stock is why we publish a burst pipe repair cost page for the city.
Water lines
Burial depth for a water service line in Oklahoma
Oklahoma has no statewide amendment on record (per the Oklahoma Uniform Building Code Commission) to the IRC water-service depth rule, so the IRC P2603.5.1 baseline applies statewide: water service piping buried below the frost line and not less than 12 inches below grade, with the frost line itself set by the adopting municipality; specific city figures (e.g., Oklahoma City, Tulsa) could not be independently confirmed against primary code text within the research window and were excluded rather than risk citing an unverified number.
Under the model rule that Oklahoma works from, a water service line goes Water service pipe shall be installed not less than 12 inches (305 mm) deep and not less than 6 inches (152 mm) below the frost line.
which puts the floor here at 12 inches. 2021 International Residential Code, Section P2603.5 (Freezing), ICC free code viewer. Your water utility may specify more for the portion of the service it owns, and the building department that issues the permit has the final say. The national picture is on how deep water lines are buried.
Get quotes from local pros
Angi is a national marketplace for home services. You describe the job, and plumbing contractors who work in your area contact you with their own quotes. Requesting quotes is free and you are never obliged to hire anyone.
Angi pays us a referral fee for a completed service request. The fee comes from Angi, not from you, and it does not change the cost figures on this page.
Common questions
Oklahoma frost line questions
How deep is the frost line in Oklahoma?
Oklahoma publishes no statewide figure. The Village, inside the Oklahoma City metro, sets 18 inches in its adopted Table R301.2(1), which is the one Oklahoma figure we could read in an official document. We could not verify Oklahoma City's or Tulsa's own numbers against anything readable, so we do not print them. Your municipal building department has the figure that governs your permit, and anything you find on a contractor or deck-building site for Oklahoma is very likely an estimate rather than a code citation.
How cold does it get in Oklahoma City, and does that threaten pipes?
Oklahoma City averages roughly 15 nights a year below 20°F and 72 nights below freezing, with a median first freeze on 2 November. That is enough winter to take seriously and not so much that houses are built for it, which is the combination behind most burst-pipe calls. Insulate anything in the attic or the crawl space and drain the outside spigots before the first hard freeze.
Next
Where to go from here
The frost depth is the digging number. It won’t tell you whether your pipes are at risk this winter, and the two pages that will are at what temperature pipes freeze and when pipes freeze where you live, both with a ZIP lookup. If a pipe has already split, burst pipe repair cost covers the repair and the water damage behind it, and what to do about a frozen pipe is the page to open first.
Local cost pages in Oklahoma: Burst pipe repair in Oklahoma City, Water heater replacement in Oklahoma City.
Other state pages: Minnesota, Iowa, Michigan, Ohio, Indiana, Illinois, Virginia, Wisconsin, and all fifty in the national table.
Where these numbers come from
The Oklahoma frost figure was researched against the body that publishes it, and it’s recorded with a confidence note of “one city verified” in our source ledger. Freeze dates are NOAA normals for stations in the state, picked by a fixed rule rather than by hand: first-order stations, spread west to east. The full method is on our methodology page.
- Freeze dates and cold-night counts: NOAA NCEI U.S. Climate Normals, 1991 to 2020, annual and seasonal by station. Retrieved 2026-09-09. Field definitions are in the by-variable readme.
- ZIP code locations: U.S. Census Bureau 2023 ZIP Code Tabulation Area gazetteer, matched to the nearest station by great-circle distance.
- Oklahoma Uniform Building Code Commission (OUBCC) The Oklahoma frost depth figure and basis.
- 2021 International Residential Code, Section P2603.5 (Freezing), ICC free code viewer The water service line burial rule.
The full method, including how we pick a station and what we do when there is not one close enough, is on our methodology page.
Get a real number for your repair
Plumbing work in Oklahoma?
Compare quotes from independent, licensed plumbers who know what your jurisdiction requires. Free to you.
Free to you. PlumbingRepairCost connects homeowners with independent, licensed plumbers who pay us — that never changes what you pay. We are not a plumbing contractor and we do not dispatch emergency crews.
How to get an honest price
Start with the range. Use the cost tables here to learn the national range and what moves the price for your job.
Get it in writing. Ask two or three licensed plumbers for an itemized quote that separates parts from labor.
Compare like for like. Confirm the scope, warranty, and permit before you compare totals.
Every cost figure on this site is cited to current industry cost data. We do not set prices and we take no payment from you.