FrostList

When to Winterize Your RV in Round Rock, TX

ON TRACK145 days until first 28°F freezeDec 3

Aim to winterize your RV in Round Rock by November 23, roughly a week and a half before the median first 28°F freeze of December 3, which one fall in ten shows up by November 12. Year to year the date swings about 47 days, which is why the live outlook beats the calendar.

OUTLOOK

Typical first first 28°F freeze near Dec 3; local deadline about Nov 23. The live 10-day outlook loads here.

Local freeze dates for Round Rock

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 3Nov 20Dec 9
28°F (hard freeze)Nov 12Dec 3Dec 29
24°F (severe)Nov 26Dec 20Jan 27

NOAA station: Austin Great Hills · 8.3 mi away · 880 ft elevation.

The reference station for Round Rock is Austin Great Hills (8.3 mi, 880 ft). First freeze there: 32°F by Nov 20, 28°F by Dec 3, 24°F by Dec 20. The 28°F freeze has come as early as Nov 12 and as late as Dec 29, a 47-day spread. Spring's last 32°F freeze clears around Mar 11.

The freeze arrives in two steps in Round Rock: 32°F around Nov 20, then a hard 28°F near Dec 3. Year to year, the first 32°F night has fallen anywhere from Nov 3 to Dec 9 — about 36 days apart. Spring's final freeze lands near Mar 11 and as late as Mar 29, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Mar 11 — not snow load — drives the local prep list.

Your rv checklist

  1. Drain the fresh, gray, and black tanks, then drain the water heater only after it has cooled and lost pressure.
  2. Bypass the water heater so you do not waste six gallons of antifreeze filling the tank.
  3. Blow out the lines with a compressor at about 30–40 psi, then pump non-toxic RV antifreeze through every faucet until it runs pink.
    Helpful gear: RV antifreeze (6-pack) — Recommended pick
  4. Use a water-pump converter kit to draw antifreeze straight from the jug through the plumbing.
    Helpful gear: Water pump converter kit — Recommended pick
  5. Pour a cup of antifreeze into each drain trap and the toilet to protect the seals.
  6. Fit a blow-out plug at the city-water inlet so you can clear that line too.
    Helpful gear: Blow-out plug — Recommended pick
  7. Remove batteries or put them on a maintainer, and store them off a cold concrete floor.
  8. Cover roof vents, close the propane, and set out traps or deterrents so mice do not move in.

What to have on hand

RV antifreeze (6-pack)
Non-toxic pink fluid for the fresh-water plumbing and traps.
Recommended pick
Water pump converter kit
Siphon kit that draws antifreeze straight through the pump.
Recommended pick
Blow-out plug
Adapter that lets a compressor clear the lines before antifreeze.
Recommended pick
Heated fresh-water hose
For anyone staying hooked up through a cold snap.
Recommended pick

What this means locally

Round Rock freezes close to Pflugerville (Dec 3) and close to Cedar Park (Dec 3) — a reminder that even nearby towns differ by days. Statewide, Texas prep dates run Oct 27 through Dec 29, which is why Round Rock gets its own number rather than a Texas-wide average. The same freeze also decides when to shut down your sprinklers and winterize a boat.

Other winter jobs in Round Rock

Every task below is dated to Round Rock's own freeze and snow normals.

Sprinklers → Nov 23Frozen pipes → Nov 3Car battery → Dec 3Sump pump → Mar 11Boat → Nov 26Motorcycle → Nov 20

See the full Round Rock winter checklist, in order →

Frequently asked questions

At what temperature do RV pipes freeze?
An RV's exposed plumbing and thin-walled tanks can begin to freeze once temperatures sit in the mid-20s for a few hours, sooner than a house because there is little insulation around the lines. That is why the winterizing deadline tracks the first 28°F freeze rather than the first light frost.
How much RV antifreeze do I need?
Most travel trailers and motorhomes take about two to three gallons of non-toxic RV antifreeze, and larger rigs more. Bypassing the water heater saves roughly six gallons you would otherwise waste filling the tank. Buy an extra jug; stores sell out once the first freeze warnings hit.
Can I just use my RV furnace instead of winterizing?
Relying on the furnace is risky. A propane run-out, a tripped breaker, or a dead battery during a cold night leaves the plumbing unprotected, and the furnace may not keep the underbelly and bays warm enough anyway. Draining and adding antifreeze is the dependable way to protect the system.
How do I winterize an RV water heater?
Let the tank cool and lose pressure, then drain it and, if fitted, pull the anode rod. Do not add antifreeze to the water heater tank; instead, set the bypass valves so antifreeze skips the tank and fills only the lines. Fresh antifreeze in an unbypassed heater just wastes several gallons.
When is it safe to de-winterize an RV in Round Rock?
Wait until the last spring freeze has passed, which averages near Mar 11 here. De-winterize by flushing the antifreeze from the lines, sanitizing the fresh tank, and checking for leaks before a trip. Reopening too early risks a surprise late freeze on a charged system.
Do I need to winterize an RV stored indoors?
A reliably heated indoor space that stays above freezing protects the plumbing, so full winterizing may not be needed. But an unheated garage or barn can still drop below freezing on a cold night. If you cannot guarantee the space stays warm, winterize to be safe.

Data: NOAA 1991–2020 normals via Austin Great Hills, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.