FrostList

When to Winterize Your RV in El Cajon, CA

ON TRACK172 days until first 28°F freezeDec 30

El Cajon's median first 28°F hard freeze is December 30 (1991–2020 NOAA normals), and it can strike as early as December 7 — so winterize your RV in El Cajon by December 20. The early-odds date runs roughly 23 days ahead of the median, so build in that buffer.

OUTLOOK

Typical first first 28°F freeze near Dec 30; local deadline about Dec 20. The live 10-day outlook loads here.

Local freeze dates for El Cajon

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Dec 1Dec 21Jan 15
28°F (hard freeze)Dec 7Dec 30Jan 14

NOAA station: El Cajon · 2.0 mi away · 495 ft elevation.

For El Cajon, the nearest NOAA station with freeze data is El Cajon, 2.0 miles out at 495 feet. Median first-freeze dates there run 32°F by Dec 21, 28°F by Dec 30. The 28°F freeze has come as early as Dec 7 and as late as Jan 14, a 38-day spread. Spring's last 32°F freeze clears around Jan 6.

In El Cajon, freezing nights (32°F) typically begin around Dec 21 and the first hard freeze (28°F) follows near Dec 30. The 32°F date swings from Dec 1 at its earliest to Jan 15 at its latest, near 45 days. The last spring freeze averages Jan 6 and as late as Feb 7, which sets the safe window for reopening outdoor water and de-winterizing gear. Snow barely registers here; the freeze date, around Jan 6, is the one that matters.

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

Compared with nearby cities, El Cajon's first-freeze date near Dec 30 sits close to Santee (Dec 30) and close to La Mesa (Dec 30). California's deadlines span Jan 6 to Dec 27 statewide — one date for all of California would be off by weeks for El Cajon. Once you know El Cajon's freeze date, use it to shut down your sprinklers and winterize a boat too.

Other winter jobs in El Cajon

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

Sprinklers → Dec 20Frozen pipes → Dec 1Car battery → Dec 30Sump pump → Jan 6Boat → Dec 23Motorcycle → Dec 21

See the full El Cajon 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 El Cajon?
Wait until the last spring freeze has passed, which averages near Jan 6 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 El Cajon, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.