FrostList

When to Winterize Your Boat in Tacoma, WA

ON TRACK143 days until first 28°F freezeDec 1

Plan to haul out and winterize your boat in Tacoma by November 24. The first 28°F freeze near Tacoma averages December 1 in the 1991–2020 normals, and freeze damage often surprises owners in milder states. 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 24. 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 boat checklist

  1. Change the engine oil and filter while the motor is warm so contaminants leave with the old oil.
  2. Run the engine on antifreeze until pink fluid reaches the outlet, protecting the block and manifolds.
    Helpful gear: Marine antifreeze — Recommended pick
  3. Fog the cylinders with fogging oil as the engine runs down to coat internal parts against corrosion.
    Helpful gear: Fogging oil — Recommended pick
  4. Top off the fuel tank and add stabilizer to limit condensation and protect ethanol-blend fuel.
    Helpful gear: Marine fuel stabilizer — Recommended pick
  5. Drain the raw-water system, the livewell, and any washdown lines that can trap water.
  6. Remove the battery, charge it fully, and keep it on a maintainer over the layup.
    Helpful gear: Battery maintainer — Recommended pick
  7. Support the cover so snow and rain shed off, and leave vents so the interior can breathe.
  8. For an inboard or sterndrive, follow the manual closely — those blocks are the ones freeze claims hit hardest.

What to have on hand

Marine antifreeze
Propylene-glycol fluid rated for engine blocks and systems.
Recommended pick
Marine fuel stabilizer
Additive that protects ethanol-blend fuel over the layup.
Recommended pick
Fogging oil
Spray that coats cylinders against corrosion in storage.
Recommended pick
Battery maintainer
Keeps the cranking battery topped off on the trailer.
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 9 to Dec 4, so a statewide rule of thumb would miss Tacoma by weeks. In Tacoma, that same cold is your cue to winterize an RV and store a motorcycle.

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 8RV → Nov 21Motorcycle → Nov 14

See the full Tacoma winter checklist, in order →

Frequently asked questions

At what temperature does a boat engine block crack?
Trapped water in an engine block or manifold can freeze and crack the casting once temperatures fall below 32°F and stay there long enough. Inboard and sterndrive blocks hold the most water and are the most vulnerable. Draining fully and adding antifreeze before the first hard freeze near Dec 1 is the protection.
Do outboards need winterizing?
Yes. An outboard should be drained so no water sits in the powerhead or lower unit, and the fuel system stabilized. Outboards self-drain better than inboards when tilted down, but fogging the cylinders and changing the gear oil are still part of a proper layup.
Fogging oil: is it necessary?
Fogging coats the cylinder walls and internal parts with a film that resists corrosion during months of storage. On engines that sit all winter it is cheap insurance against rust, especially in humid or coastal storage. Follow your engine maker's guidance on how to apply it.
How much does boat winterization cost?
A professional winterization varies with engine type and boat size, and inboards cost more than a simple outboard. Doing it yourself costs mainly antifreeze, oil, and fogging oil. Either way, the bill is far smaller than repairing a cracked block, which is the failure winterizing prevents.
Do boats in WA really need winterizing?
If temperatures reach freezing where the boat is stored, yes. Freeze claims are common in milder states precisely because owners assume they are safe and skip the step, then a rare cold snap cracks a block. Check the local freeze dates above and protect the engine before the first hard freeze.
When should I de-winterize my boat?
De-winterize in spring once the risk of a hard freeze has passed for your area. Reconnect and charge the battery, replace drain plugs, check hoses and clamps, and inspect the fuel system before the first launch. Reopening too early leaves the block exposed to a late cold snap.

Data: NOAA 1991–2020 normals via Tacoma #1, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.