Austin Freeze Events & Burst-Pipe Data Reference
A sourced reference on how Central Texas freeze events drive burst-pipe calls across Travis County: official freeze-season timing, the historical record (Winter Storm Uri, February 2021; Winter Storm Mara, February 2023; the January 2026 ice event), what Austin Water’s own after-action data says about pipe failures, and which home types and pipe materials carry the most freeze risk. Every figure below comes from a public source — NOAA’s National Centers for Environmental Information (NCEI), Austin Water’s own published after-action report, the National Weather Service, and Austin newsroom reporting on City of Austin briefings — linked at the point of use so it can be independently checked.
Travis County Freeze Season at a Glance
| Measure | Value | Source |
|---|---|---|
| Typical freeze-risk window | Mid-November through mid-March, with individual hard-freeze events most common in January and February | NWS Austin/San Antonio (EWX) seasonal pattern; KXAN freeze-stat analysis |
| Average freezes per winter (1897/98–2024/25 seasonal record) | About 19 freezes (32°F or below) per season, trending downward over the long-term record | KXAN Austin freeze-stats analysis of NWS Camp Mabry data |
| Total recorded freezes since 1897/98 | 2,383 | KXAN Austin freeze-stats analysis |
| Coldest temperature ever recorded in Austin | -2°F, January 31, 1949 | KXAN Austin weather-extremes analysis of NWS records |
| Longest sub-freezing stretch on record | 144 consecutive hours at or below 32°F at Camp Mabry, February 12–18, 2021 (Winter Storm Uri) — the longest such stretch in Austin’s recorded history | NWS/KXAN; Austin Water After-Action Report |
Notable Historical Freeze Events in the Austin Area
| Year | Event | What happened | Source |
|---|---|---|---|
| 1949 | Jan. 31 record cold | Austin fell to -2°F, still the coldest temperature ever recorded in the city. | KXAN / NWS records |
| 2021 | Winter Storm Uri (Feb. 11–20) | Every Texas county placed under a Winter Storm Warning. Austin-Bergstrom Airport stayed below freezing for 164 consecutive hours; Camp Mabry recorded 144 consecutive hours — the longest sub-freezing stretch on record. Minimum temperature: 6°F. Six inches of snow fell Feb. 14–15. The event triggered a citywide Boil Water Notice and widespread private-plumbing pipe bursts. | NOAA/NCEI “Great Texas Freeze”; Austin Water After-Action Report (Nov. 2021) |
| 2023 | Winter Storm Mara (Jan. 30–Feb. 2) | The worst icing event in the region in more than 15 years. Camp Mabry recorded 0.69″ of ice. An estimated 10.5 million trees were damaged or destroyed regionally, and about 265,000 Austin Energy customers (roughly 30% of the utility’s base) lost power as ice-laden limbs took down lines. | KUT/KXAN reporting; 2023 South Central Texas Ice Storm StoryMap |
| 2026 | January winter storm (Jan. 21–26) | NWS issued a Winter Storm Warning and a rare Ice Storm Warning for Travis, Hays, and Williamson counties. Wind chills fell into the single digits; Austin-Bergstrom recorded roughly 0.8″ of sleet plus about 0.1″ of freezing rain, with up to ¼″–½″ of ice reported in parts of the Hill Country and along the I-35 corridor. Gov. Abbott issued disaster declarations for more than 130 counties ahead of the front. | KUT Austin (Jan. 21 and Jan. 23, 2026 reporting); NWS Austin/San Antonio |
This is a representative, not exhaustive, list of the highest-impact events in the modern record. Full source pages are linked in Sources & Further Reading below.
What Winter Storm Uri Did to Austin’s Water System
Austin Water’s own November 2021 After-Action Report is the most detailed public accounting of how a Central Texas freeze translates into burst-pipe calls at scale. The numbers below are drawn directly from that report’s Key Metrics section.
| Metric | Figure |
|---|---|
| System-wide water demand, Feb. 15 (normal winter baseline) | Approximately 150 million gallons per day (MGD) |
| Peak hourly demand, evening of Feb. 17 (private-plumbing leaks + dripping faucets + main breaks) | 330 MGD — more than double February 2020 demand levels |
| Water line repairs completed | 381 (Feb. 15–27, a 10-day window) |
| Total work orders completed | 1,200 (same 10-day window) |
| Emergency water shut-offs performed for customers with active leaks | More than 1,500 |
| Inbound call volume to Austin Water during the event | More than 10,000 calls per day |
| Online service requests received | 52,148 over 4 days, via a customer intake form launched mid-event |
The pipe-material finding that matters most for homeowners: Austin Water’s technical review, conducted by outside engineering firm Freese and Nichols, found that “within the distribution system, small diameter cast iron pipes experienced the most pipe breaks compared to other pipe sizes and materials.” That finding was specific to the City’s distribution mains, but the same freeze-and-thaw mechanics apply inside a house: older, smaller-diameter, more brittle piping is the material most likely to crack under sustained sub-freezing pressure.
Source: Austin Water – Winter Storm Uri After-Action Report (Nov. 3, 2021).
Which Austin Homes & Pipe Materials Carry the Most Freeze Risk
| Home / pipe characteristic | Why it raises freeze risk |
|---|---|
| Small-diameter cast iron supply lines | Confirmed by Austin Water’s own technical review as the pipe type with the most breaks during Uri — smaller mass means faster freeze-through, and cast iron is more brittle under expansion pressure than modern PEX. |
| Pipes routed through attics, garages, or exterior walls | Central Texas homes are typically built to a warm-climate code that doesn’t require the same pipe insulation depth as northern-climate construction — unconditioned spaces see interior temperatures track much closer to outdoor air during a hard freeze. |
| Exposed hose bibs and irrigation backflow devices | Uninsulated exterior spigots and above-ground irrigation components are typically the first point of failure in even a short freeze event. |
| Manufactured and mobile homes | Pipes routed through an unheated underbelly or skirting have less thermal protection than a home built on a conditioned slab. |
| Homes left unattended during a freeze warning | No one present to maintain a targeted drip, monitor the thermostat, or notice an early leak — a key factor Austin Water flagged in the 2021 event, where widespread simultaneous private-plumbing failures overwhelmed system capacity. |
Austin Water’s Own Freeze-Prep Guidance
Austin Water updated its public messaging after Uri, moving away from a blanket “drip every faucet” message toward more targeted guidance:
- Insulate exposed pipes in unheated or drafty areas — attics, garages, crawl spaces — using pipe insulation, heat tape, or even wrapped newspaper.
- Use a slow, targeted drip on the indoor faucet farthest from the water meter rather than dripping every faucet in the house.
- Open cabinet doors under sinks on exterior walls so warm room air can reach the supply lines.
- Disconnect garden hoses, shut off exterior spigots, and insulate outdoor faucets with covers, socks, or towels.
- Turn off and drain automatic sprinkler/irrigation systems before a freeze arrives.
- If leaving the home during a hard freeze, shut off water at the meter and keep the thermostat at 65°F or higher.
Source: Austin Water – Cold Weather Tips; Austin Water Winter Weather Preparedness Tips (PDF).
Frequently Asked Questions
When is freeze season in Austin, Texas?
Travis County’s freeze-risk window runs roughly mid-November through mid-March, with individual hard-freeze events historically most common in January and February. The two highest-impact events in the modern record — Winter Storm Uri (2021) and Winter Storm Mara (2023) — both landed in the first week of February.
What did Winter Storm Uri do to Austin’s water system?
Per Austin Water’s own after-action report, system-wide demand more than doubled (150 MGD to a peak of 330 MGD) as private-plumbing leaks, dripping faucets, and main breaks combined. Crews completed 381 water line repairs and 1,200 work orders in ten days, performed more than 1,500 emergency shut-offs, and the utility received more than 10,000 calls per day plus 52,148 online service requests in four days.
How often does Austin actually freeze?
Austin has recorded 2,383 freezes (32°F or below) since record-keeping began in the 1897/98 season, averaging about 19 per winter, though the KXAN analysis of NWS data shows that average trending downward over the long-term record.
What pipe materials are most likely to break in a Central Texas freeze?
Austin Water’s independent technical review (conducted by Freese and Nichols) found that small-diameter cast iron pipes experienced the most breaks in the distribution system during Winter Storm Uri, compared to other pipe sizes and materials.
Should I drip every faucet during a freeze warning?
Austin Water’s current guidance is more targeted than the blanket advice used before 2021: drip only the indoor faucet farthest from your water meter, and open cabinet doors under sinks on exterior walls so warm air can reach the pipes.
Could an event like Winter Storm Uri happen again?
Austin Water and Austin Energy have both published corrective-action plans since 2021 (winterizing treatment-plant components, adding backup generation, replacing small-diameter cast iron mains). Central Texas has still seen freeze events every winter since — including Winter Storm Mara in 2023 and a significant ice/winter-storm event in January 2026 — so freeze preparedness remains a standing seasonal concern, not a one-time event.
Where can I check current freeze and winter storm warnings for Travis County?
The National Weather Service Austin/San Antonio office (NWS EWX) issues Winter Storm Warnings, Hard Freeze Warnings, and Ice Storm Warnings by county, viewable on their public forecast pages, and the City of Austin posts active-event updates through Austin Water and Austin-Travis County emergency communications channels.
Dealing with a burst pipe or no water after a freeze in the Austin area?Enter your ZIP on our homepage and we’ll connect you with a licensed Texas Master Plumber near you. Free to request, no obligation — we’re a referral and dispatch service, not a plumbing company.Sources & Further Reading
- NOAA NCEI – The Great Texas Freeze: February 11–20, 2021
- Austin Water – Winter Storm Uri After-Action Report (PDF, Nov. 3, 2021)
- City of Austin Open Data Portal – Year in Review: Winter Storm Uri
- Austin Water – Cold Weather Tips
- Austin Water – Winter Weather Preparedness Tips (PDF)
- KXAN – How often does Austin freeze? A breakdown by date, month, year and decade
- KXAN – Austin’s hottest and coldest temperatures ever recorded
- KUT – Winter storm warning issued for Austin area (Jan. 21, 2026)
- KUT – Road conditions treacherous after Austin-area ice event (Jan. 23, 2026)
- 2023 South Central Texas Ice Storm – StoryMap
Note on City of Austin 311 / open-data burst-pipe volume: the City’s open-data portal (data.austintexas.gov) publishes 311 service-request data and hosts a dedicated Winter Storm Uri story page. We were not able to independently verify a specific published count of burst-pipe/plumbing 311 requests during Uri at the time this reference was compiled, so that figure is described qualitatively above rather than cited as a specific number. Austin Water’s own After-Action Report — a primary utility source with audited figures — is used for the specific infrastructure metrics in this reference instead.
Related Austin Resources
About this reference
This page compiles publicly available data from NOAA’s National Centers for Environmental Information, Austin Water’s published After-Action Report, the National Weather Service, and Austin-market news reporting on official city and utility briefings. It is a data reference, not plumbing advice specific to any property. Compiled July 2026; source pages are linked directly above so figures can be independently verified.
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