Average US homeowners-insurance claim for water damage and freezing (2019–2023). Roughly 1 in 60 insured homes files one every year.
Insurance Information InstituteWhen to Prevent Frozen Pipes in San Ramon, CA
ON TRACK164 days until first freezing night (32°F)Dec 22
In San Ramon, plan for freezing nights from about December 22 onward — one year in ten by November 23 — and treat any low in the low 20s as a pipe-risk night. It's a short step from frost to a hard freeze: roughly 25 days on average.
Nov 23Local deadline
Dec 22First freezing night
85 days28°F window spread
1 inSnow per season
OUTLOOK
Typical first first freezing night (32°F) near Dec 22; local deadline about Nov 23. The live 10-day outlook loads here.
Local freeze dates for San Ramon
| Threshold | Early (1-in-10) | Median | Late (9-in-10) |
|---|---|---|---|
| 32°F (light freeze) | Nov 23 | Dec 22 | Feb 11 |
| 28°F (hard freeze) | Dec 8 | Jan 16 | Mar 3 |
Bars span the early (1-in-10) to late (9-in-10) window for each freeze threshold; the dot marks the median year. The dashed line is the local prep deadline.
NOAA station: Mt Diablo Junction · 7.3 mi away · 2,170 ft elevation.
- San Ramon is on the early end of the national freeze calendar; plan as if fall cold arrives ahead of schedule.
- With about 85 days separating the early and late dates, watch the live outlook rather than banking on the median.
Numbers for San Ramon come from Mt Diablo Junction, 7.3 miles away at 2,170 feet, where the medians fall 32°F by Dec 22, 28°F by Jan 16. Year to year the 28°F date has ranged from Dec 8 to Mar 3 — about 85 days apart. Spring's last 32°F freeze clears around Mar 8. Snowfall averages 1 inches a year.
Expect the first frost near Dec 22 in San Ramon and the first hard freeze by about Jan 16. Year to year, the first 32°F night has fallen anywhere from Nov 23 to Feb 11 — about 80 days apart. Spring's final freeze lands near Mar 8 and as late as Apr 15, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Mar 8 — not snow load — drives the local prep list.
Your frozen pipes checklist
- Disconnect, drain, and store garden hoses, then shut off and drain any interior valves that feed outdoor faucets.
- Insulate exposed pipes in the garage, crawl space, and along exterior walls with foam sleeves rated for the pipe size.Helpful gear: Foam pipe insulation sleeves — Recommended pick
- On nights in the low 20s, let a pencil-thin stream of water drip from the faucet farthest from where the line enters.
- Open cabinet doors under kitchen and bathroom sinks on outside walls so household heat reaches the plumbing.
- Add self-regulating heat cable to the runs most likely to freeze, such as a pipe in an unheated garage.Helpful gear: Self-regulating heat cable — Recommended pick
- Cap outdoor faucets with insulated covers once the hoses are off.Helpful gear: Outdoor faucet covers — Recommended pick
- Know where your main shutoff is and confirm it turns; a fast shutoff limits water damage if a line lets go.
- If you travel, keep the thermostat at 55°F or higher and ask someone to check the house during a cold snap.Helpful gear: Wi-Fi water leak sensor — Recommended pick
What to have on hand
As an Amazon Associate we may earn from qualifying purchases. Product picks are editorial; links do not change what you pay.
Foam pipe insulation sleeves
Split foam tubing for exposed pipes in crawl spaces and garages.
Recommended pickSelf-regulating heat cable
Thermostatic cable that warms vulnerable runs only when it is cold.
Recommended pickOutdoor faucet covers
Insulated caps for hose bibs once the hoses come off.
Recommended pickWi-Fi water leak sensor
Puck that pings your phone the moment it senses water.
Recommended pickFrozen pipe damage: the key numbers
Verified national benchmarks; sources open in a new tab (nofollow).
The outdoor temperature at which uninsulated pipes in unheated spaces begin to freeze, per Building Research Council field tests — the widely used "temperature alert threshold".
University of IllinoisHow much water a 1/8-inch pipe crack can release into your home. Ice blockage drives trapped water pressure from ~50 PSI to over 4,000 PSI before the pipe fails.
IBHSCost of self-seal foam pipe insulation per linear foot — the cheapest protection there is. Keep the thermostat at 55°F or higher, even when away.
American Red CrossWhat this means locally
San Ramon freezes close to Danville (Dec 22) and later than Dublin (Dec 2) — a reminder that even nearby towns differ by days. Statewide, California prep dates run Oct 17 through Dec 23, which is why San Ramon gets its own number rather than a California-wide average. The same freeze also decides when to shut down your sprinklers and check your car battery. Keeping an eye on the rest of the county? The same local math is on our San Rafael and Santa Ana pages.
Other winter jobs in San Ramon
Every task below is dated to San Ramon's own freeze and snow normals.
Get the Frozen Pipe Protection alert for your city
We will email you when local conditions cross the line. Double opt-in; unsubscribe anytime.
Frequently asked questions
At what temperature do pipes freeze?
Pipes generally come under risk when the temperature outside falls to about 20°F, the threshold many guides use for taking action. Pipes in unheated or exterior-wall spaces freeze sooner than well-insulated interior runs. Wind and poor insulation lower the effective temperature, so a windy night in the mid-20s can be as risky as a still night in the low 20s.
Should I drip my faucets tonight in San Ramon?
If the overnight low is forecast at or below about 20°F, letting a thin stream run from the faucet farthest along the line is a low-cost precaution. Moving water is slower to freeze and relieves pressure. Check tonight's low against the live outlook above; freezing nights here typically begin around Dec 22.
How long does it take for pipes to freeze?
There is no fixed clock; it depends on pipe location, insulation, and how far below freezing the air drops. An exposed pipe in a windy, unheated space can freeze in a matter of hours during a hard cold snap, while a protected interior pipe may never reach freezing. The colder and windier it is, the faster it happens.
Which pipes freeze first?
The most exposed pipes freeze first: outdoor hose bibs, and lines in unheated garages, crawl spaces, attics, and along exterior walls. Pipes under sinks on outside walls are common trouble spots. That is why disconnecting hoses and opening cabinet doors on cold nights are two of the highest-value steps.
Does homeowners insurance cover burst pipes?
Sudden, accidental water damage from a frozen pipe is often covered, but insurers may deny a claim if the home was left unheated or the damage is judged to be from neglect. Coverage varies by policy. Keeping the heat on and taking reasonable precautions helps protect both your home and your claim.
What temperature should I keep my house if I'm away?
A common recommendation is to keep the thermostat no lower than 55°F while you are away so interior walls stay warm enough to protect the plumbing. Leaving cabinet doors open and having someone check the house during a cold snap adds a margin of safety, especially for pipes on exterior walls.
Frozen Pipe Protection: related searches
Searches this guide answers: what temperature do pipes freeze, heat tape for pipes, letting faucets drip in winter, and how to keep pipes from freezing in a crawl space.
pipe freeze temperaturehow to keep pipes from freezingheat tape for pipespipe insulation cost per footlet faucets drip in winterburst pipe insurance claimthermostat setting for vacation in winterfrozen pipe prevention checklistpipes freezing in crawl spaceoutdoor faucet coverfrost-free hose bibmain water shut-off valve location
Data: NOAA 1991–2020 normals via Mt Diablo Junction, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 25, 2026.