FrostList

When to Winterize Your RV in Minot, ND

ON TRACK91 days until first 28°F freezeOct 10

Aim to winterize your RV in Minot by September 30, roughly a week and a half before the median first 28°F freeze of October 10, which one fall in ten shows up by September 27. It's a short step from frost to a hard freeze: roughly 9 days on average.

OUTLOOK

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

Local freeze dates for Minot

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 19Oct 1Oct 14
28°F (hard freeze)Sep 27Oct 10Oct 23
24°F (severe)Oct 6Oct 20Nov 1

NOAA station: Minot Intl AP · 1.8 mi away · 1,665 ft elevation.

Minot draws its numbers from Minot Intl AP, 1,665 feet up and 1.8 miles away. Its median first-freeze dates are 32°F by Oct 1, 28°F by Oct 10, 24°F by Oct 20. The 28°F freeze has come as early as Sep 27 and as late as Oct 23, a 26-day spread. Spring's last 32°F freeze clears around May 10. Snowfall averages 45 inches a year, first reaching an inch near October.

Expect the first frost near Oct 1 in Minot and the first hard freeze by about Oct 10. Year to year, the first 32°F night has fallen anywhere from Sep 19 to Oct 14 — about 25 days apart. Spring's final freeze lands near May 10 and as late as May 22, so that is when outdoor water and stored gear can safely come back online. With about 45 inches of snow a year, roof, snow-blower, and ice-dam prep all belong on the same calendar.

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

Minot freezes close to Bismarck (Oct 9) and close to Grand Forks (Oct 12) — a reminder that even nearby towns differ by days. Statewide, North Dakota prep dates run Sep 29 through Oct 4, which is why Minot gets its own number rather than a North Dakota-wide average. The same freeze also decides when to shut down your sprinklers and winterize a boat.

Other winter jobs in Minot

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

Sprinklers → Sep 30Frozen pipes → Sep 19Ice dams → Sep 15Car battery → Oct 10Snow blower → Sep 24Sump pump → May 10Boat → Oct 3Motorcycle → Oct 1

See the full Minot 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 Minot?
Wait until the last spring freeze has passed, which averages near May 10 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 Minot Intl AP, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.