FrostList

When to Store Your Motorcycle in Seattle, WA

ON TRACK129 days until first 32°F freezeNov 17

Layup time in Seattle tracks the first 32°F freeze, which averages November 17: stabilize the fuel, change the oil, and keep the battery on a tender through the cold. Riding tends to open again after the last freeze near March 13. Plan for the early end: the one-in-ten date lands about 20 days before the median.

OUTLOOK

Typical first first 32°F freeze near Nov 17; local deadline about Nov 17. The live 10-day outlook loads here.

Local freeze dates for Seattle

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 1Nov 17Dec 6
28°F (hard freeze)Nov 12Dec 2Dec 30
24°F (severe)Nov 21Dec 14Jan 29

NOAA station: Seattle Boeing Fld · 5.4 mi away · 20 ft elevation.

Numbers for Seattle come from Seattle Boeing Fld, 5.4 miles away at 20 feet, where the medians fall 32°F by Nov 17, 28°F by Dec 2, 24°F by Dec 14. Year to year the 28°F date has ranged from Nov 12 to Dec 30 — about 48 days apart. Spring's last 32°F freeze clears around Mar 13. Snowfall averages 4 inches a year, first reaching an inch near December.

Seattle usually sees its first 32°F night about Nov 17, with the first 28°F hard freeze close behind near Dec 2. That first freezing night has ranged from Nov 1 to Dec 6, roughly a 35-day spread. On the spring side, the last 32°F freeze clears around Mar 13 and as late as Apr 1 — the green light for reopening water and de-winterizing. Only about 4 inches of snow falls in a typical year, so cold protection outranks snow removal.

Your motorcycle checklist

  1. Fill the tank and add fuel stabilizer, then ride or idle a few minutes so treated fuel reaches the injectors or carbs.
    Helpful gear: Fuel stabilizer — Recommended pick
  2. Change the oil and filter before storage so acids in used oil do not sit on internal parts all winter.
  3. Put the battery on a tender for the whole layup rather than starting the bike for a few minutes now and then.
    Helpful gear: Battery tender — Recommended pick
  4. Set tire pressure to spec and, if you can, lift the wheels with stands so the tires do not flat-spot.
    Helpful gear: Front paddock stand — Recommended pick
  5. Lube the chain and wipe down bare metal with a light protectant to fend off corrosion.
  6. Plug the exhaust and airbox loosely so mice cannot nest, and set traps nearby as a backup.
  7. Cover the bike with a breathable cover indoors so moisture does not get trapped against the paint.
    Helpful gear: Breathable motorcycle cover — Recommended pick
  8. In spring, remove the plugs, check tire pressure and brakes, and reconnect the battery before the first ride.

What to have on hand

Battery tender
Smart charger that holds the battery through a long layup.
Recommended pick
Fuel stabilizer
Keeps a full tank from varnishing over the winter.
Recommended pick
Breathable motorcycle cover
Indoor cover that keeps dust off without trapping moisture.
Recommended pick
Front paddock stand
Lifts the front wheel so tires do not flat-spot in storage.
Recommended pick

What this means locally

Compared with nearby cities, Seattle's first-freeze date near Nov 17 sits about a week ahead of Bellevue (Nov 23) and about a week ahead of Kirkland (Nov 23). Washington's deadlines span Oct 4 to Nov 23 statewide — one date for all of Washington would be off by weeks for Seattle. Once you know Seattle's freeze date, use it to test your car battery and winterize a boat too.

Other winter jobs in Seattle

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

Sprinklers → Nov 22Frozen pipes → Nov 1Ice dams → Nov 15Car battery → Dec 2Snow blower → Nov 24Sump pump → Mar 13RV → Nov 22Boat → Nov 25

See the full Seattle winter checklist, in order →

Frequently asked questions

Should I start my motorcycle during winter storage?
It is better not to. Starting the bike for a few minutes does not fully warm the oil or charge the battery, and it leaves moisture and acids inside the engine and exhaust. A battery tender keeps the battery healthy without running the engine, which is the approach most enthusiasts and manuals favor.
Do I store a motorcycle with a full or empty tank?
Store it with a full tank and fuel stabilizer added. A full tank leaves less room for the condensation that causes rust inside the tank, and stabilizer keeps the fuel from breaking down over months of storage. Ride or idle briefly after adding stabilizer so it reaches the fuel system.
How do I keep mice out of my motorcycle?
Loosely plug the exhaust outlets and the airbox intake so mice cannot get inside and nest, and remove the plugs before spring. Set traps or deterrents around the storage area, and avoid leaving food or cardboard nearby. Check periodically through the winter for signs of activity.
Battery tender vs trickle charger?
A modern battery tender, or smart charger, monitors the battery and switches to a maintenance charge when full, so it is safe to leave connected all winter. A basic trickle charger keeps pushing current and can overcharge a battery over time. For long storage, use a tender.
When does riding season end in Seattle?
Riding season here tends to wind down as freezing nights arrive near Nov 17, and reliably cold, dark evenings make regular riding less practical. Watch the live outlook above; a run of sub-45°F nights is a good signal to fuel-stabilize and put the bike on the tender.
How do I prep a motorcycle for spring?
Reconnect the charged battery, check tire pressure and tread, test the brakes, and look for leaks before the first ride. In Seattle the last freeze averages near Mar 13, a reasonable target for shaking off storage. Clean and lube the chain, and take an easy first ride to re-familiarize yourself.

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