FrostList

When to Winterize Your RV in Tacoma, WA

ON TRACK143 days until first 28°F freezeDec 1

In a typical year, winterize your RV in Tacoma by November 21. The median first 28°F hard freeze at Tacoma's NOAA station is December 1 (1991–2020 normals); one year in ten it arrives as early as November 8. 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 1; local deadline about Nov 21. The live 10-day outlook loads here.

Local freeze dates for Tacoma

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 30Nov 14Dec 2
28°F (hard freeze)Nov 8Dec 1Jan 1
24°F (severe)Nov 20Dec 17Feb 2

NOAA station: Tacoma #1 · 1.6 mi away · 25 ft elevation.

The reference station for Tacoma is Tacoma #1 (1.6 mi, 25 ft). First freeze there: 32°F by Nov 14, 28°F by Dec 1, 24°F by Dec 17. That hard freeze has landed anywhere from Nov 8 to Jan 1, a swing of roughly 54 days. Spring's last 32°F freeze clears around Mar 8. Snowfall averages 6 inches a year, first reaching an inch near November.

The freeze arrives in two steps in Tacoma: 32°F around Nov 14, then a hard 28°F near Dec 1. The 32°F date swings from Oct 30 at its earliest to Dec 2 at its latest, near 33 days. The last spring freeze averages Mar 8 and as late as Mar 31, which sets the safe window for reopening outdoor water and de-winterizing gear. At about 6 inches of snow a year, the freeze — not snow load — is the thing to plan around.

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, Tacoma (first freeze Dec 1) runs about a week ahead of Lakewood (Dec 11) and close to Federal Way (Dec 1). Across Washington, local prep deadlines in our data range from Oct 6 to Dec 1, so a statewide rule of thumb would miss Tacoma by weeks. In Tacoma, that same cold is your cue to shut down your sprinklers and winterize a boat.

Other winter jobs in Tacoma

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

Sprinklers → Nov 21Frozen pipes → Oct 30Ice dams → Oct 16Car battery → Dec 1Snow blower → Oct 25Sump pump → Mar 8Boat → Nov 24Motorcycle → Nov 14

See the full Tacoma 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 Tacoma?
Wait until the last spring freeze has passed, which averages near Mar 8 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 Tacoma #1, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.