FrostList

When to Winterize Your RV in Bend, OR

ON TRACK85 days until first 28°F freezeOct 4

In a typical year, winterize your RV in Bend by September 24. The median first 28°F hard freeze at Bend's NOAA station is October 4 (1991–2020 normals); one year in ten it arrives as early as September 18. It's a short step from frost to a hard freeze: roughly 14 days on average.

OUTLOOK

Typical first first 28°F freeze near Oct 4; local deadline about Sep 24. The live 10-day outlook loads here.

Local freeze dates for Bend

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 3Sep 20Oct 5
28°F (hard freeze)Sep 18Oct 4Oct 21
24°F (severe)Oct 3Oct 21Nov 10

NOAA station: Bend · 1.5 mi away · 3,660 ft elevation.

The reference station for Bend is Bend (1.5 mi, 3,660 ft). First freeze there: 32°F by Sep 20, 28°F by Oct 4, 24°F by Oct 21. That hard freeze has landed anywhere from Sep 18 to Oct 21, a swing of roughly 33 days. Spring's last 32°F freeze clears around Jun 6. Snowfall averages 22 inches a year, first reaching an inch near November.

Bend usually sees its first 32°F night about Sep 20, with the first 28°F hard freeze close behind near Oct 4. Year to year, the first 32°F night has fallen anywhere from Sep 3 to Oct 5 — about 32 days apart. Spring's final freeze lands near Jun 6 and as late as Jun 22, so that is when outdoor water and stored gear can safely come back online. Snowfall averages roughly 22 inches a year — enough that a working snow blower and a clear roof edge earn their keep.

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, Bend's first-freeze date near Oct 4 sits about a week ahead of Springfield (Nov 11) and about a week ahead of Eugene (Nov 11). Oregon's deadlines span Sep 24 to Dec 11 statewide — one date for all of Oregon would be off by weeks for Bend. Once you know Bend's freeze date, use it to shut down your sprinklers and winterize a boat too.

Other winter jobs in Bend

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

Sprinklers → Sep 24Frozen pipes → Sep 3Ice dams → Oct 16Car battery → Oct 4Snow blower → Oct 25Sump pump → Jun 6Boat → Sep 27Motorcycle → Sep 20

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