FrostList

When to Winterize Your RV in Concord, NH

ON TRACK94 days until first 28°F freezeOct 13

Concord's deadline to winterize your RV is October 3: the local first 28°F freeze runs October 13 on average and October 1 at its earliest (1991–2020 normals). The early-to-late range spans roughly 29 days, so treat the median as a midpoint, not a promise.

OUTLOOK

Typical first first 28°F freeze near Oct 13; local deadline about Oct 3. The live 10-day outlook loads here.

Local freeze dates for Concord

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 21Oct 3Oct 16
28°F (hard freeze)Oct 1Oct 13Oct 30
24°F (severe)Oct 10Oct 25Nov 9

NOAA station: Concord Muni AP · 2.0 mi away · 346 ft elevation.

Numbers for Concord come from Concord Muni AP, 2.0 miles away at 346 feet, where the medians fall 32°F by Oct 3, 28°F by Oct 13, 24°F by Oct 25. The 28°F freeze has come as early as Oct 1 and as late as Oct 30, a 29-day spread. Spring's last 32°F freeze clears around May 8. Snowfall averages 68 inches a year, first reaching an inch near November.

Expect the first frost near Oct 3 in Concord and the first hard freeze by about Oct 13. The 32°F date swings from Sep 21 at its earliest to Oct 16 at its latest, near 25 days. The last spring freeze averages May 8 and as late as May 22, which sets the safe window for reopening outdoor water and de-winterizing gear. Roughly 68 inches of snow fall in an average year, so a clear roof edge and a running snow blower matter as much as the freeze itself.

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, Concord (first freeze Oct 13) runs about a week ahead of Manchester (Oct 24) and about a week ahead of Nashua (Oct 24). Across New Hampshire, local prep deadlines in our data range from Oct 3 to Oct 14, so a statewide rule of thumb would miss Concord by weeks. In Concord, that same cold is your cue to shut down your sprinklers and winterize a boat.

Other winter jobs in Concord

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

Sprinklers → Oct 3Frozen pipes → Sep 21Ice dams → Oct 16Car battery → Oct 13Snow blower → Oct 25Sump pump → May 8Boat → Oct 6Motorcycle → Oct 3

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