FrostList

When to Winterize Your RV in San Jacinto, CA

ON TRACK163 days until first 28°F freezeDec 21

San Jacinto's deadline to winterize your RV is December 11: the local first 28°F freeze runs December 21 on average and December 2 at its earliest (1991–2020 normals). The early-odds date runs roughly 19 days ahead of the median, so build in that buffer.

OUTLOOK

Typical first first 28°F freeze near Dec 21; local deadline about Dec 11. The live 10-day outlook loads here.

Local freeze dates for San Jacinto

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 22Dec 10Jan 6
28°F (hard freeze)Dec 2Dec 21Jan 15
24°F (severe)Dec 9Dec 31Jan 12

NOAA station: San Jacinto · 1.3 mi away · 1,525 ft elevation.

The reference station for San Jacinto is San Jacinto (1.3 mi, 1,525 ft). First freeze there: 32°F by Dec 10, 28°F by Dec 21, 24°F by Dec 31. That hard freeze has landed anywhere from Dec 2 to Jan 15, a swing of roughly 44 days. Spring's last 32°F freeze clears around Jan 31.

The freeze arrives in two steps in San Jacinto: 32°F around Dec 10, then a hard 28°F near Dec 21. The 32°F date swings from Nov 22 at its earliest to Jan 6 at its latest, near 45 days. The last spring freeze averages Jan 31 and as late as Feb 28, which sets the safe window for reopening outdoor water and de-winterizing gear. Snow barely registers here; the freeze date, around Jan 31, 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

Against its neighbors, San Jacinto (first freeze Dec 21) runs close to Hemet (Dec 21) and close to Beaumont (Dec 21). Across California, local prep deadlines in our data range from Jan 6 to Dec 27, so a statewide rule of thumb would miss San Jacinto by weeks. In San Jacinto, that same cold is your cue to shut down your sprinklers and winterize a boat.

Other winter jobs in San Jacinto

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

Sprinklers → Dec 11Frozen pipes → Nov 22Car battery → Dec 21Sump pump → Jan 31Boat → Dec 14Motorcycle → Dec 10

See the full San Jacinto 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 San Jacinto?
Wait until the last spring freeze has passed, which averages near Jan 31 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 San Jacinto, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.