FrostList

When to Winterize Your RV in Redlands, CA

SEASON PASSED174 days until first 28°F freezeJan 1

In a typical year, winterize your RV in Redlands by December 22. The median first 28°F hard freeze at Redlands's NOAA station is January 1 (1991–2020 normals); one year in ten it arrives as early as December 13. It's a short step from frost to a hard freeze: roughly 13 days on average.

OUTLOOK

Typical first first 28°F freeze near Jan 1; local deadline about Dec 22. The live 10-day outlook loads here.

Local freeze dates for Redlands

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Dec 1Dec 19Jan 26
28°F (hard freeze)Dec 13Jan 1Feb 13

NOAA station: Redlands · 1.5 mi away · 1,410 ft elevation.

For Redlands, the nearest NOAA station with freeze data is Redlands, 1.5 miles out at 1,410 feet. Median first-freeze dates there run 32°F by Dec 19, 28°F by Jan 1. The 28°F freeze has come as early as Dec 13 and as late as Feb 13, a 62-day spread. Spring's last 32°F freeze clears around Jan 27.

Redlands usually sees its first 32°F night about Dec 19, with the first 28°F hard freeze close behind near Jan 1. Year to year, the first 32°F night has fallen anywhere from Dec 1 to Jan 26 — about 56 days apart. Spring's final freeze lands near Jan 27 and as late as Feb 28, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Jan 27 — 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

Redlands freezes close to Highland (Jan 1) and close to San Bernardino (Jan 1) — a reminder that even nearby towns differ by days. Statewide, California prep dates run Jan 6 through Dec 27, which is why Redlands gets its own number rather than a California-wide average. The same freeze also decides when to shut down your sprinklers and winterize a boat.

Other winter jobs in Redlands

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

Sprinklers → Dec 22Frozen pipes → Dec 1Car battery → Jan 1Sump pump → Jan 27Boat → Dec 25Motorcycle → Dec 19

See the full Redlands 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 Redlands?
Wait until the last spring freeze has passed, which averages near Jan 27 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 Redlands, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.