FrostList

When to Winterize Your Boat in Logan, UT

ON TRACK95 days until first 28°F freezeOct 14

Freeze protection for a Logan boat keys off the first 28°F freeze, which averages October 14, so haul out and winterize by October 7 to beat it. Plan for the early end: the one-in-ten date lands about 15 days before the median.

OUTLOOK

Typical first first 28°F freeze near Oct 14; local deadline about Oct 7. The live 10-day outlook loads here.

Local freeze dates for Logan

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 18Oct 2Oct 15
28°F (hard freeze)Sep 29Oct 14Oct 26
24°F (severe)Oct 13Oct 26Nov 9

NOAA station: Logan Radio Kvnu · 1.2 mi away · 4,475 ft elevation.

Logan draws its numbers from Logan Radio Kvnu, 4,475 feet up and 1.2 miles away. Its median first-freeze dates are 32°F by Oct 2, 28°F by Oct 14, 24°F by Oct 26. The 28°F freeze has come as early as Sep 29 and as late as Oct 26, a 27-day spread. Spring's last 32°F freeze clears around May 8. Snowfall averages 44 inches a year, first reaching an inch near November.

Expect the first frost near Oct 2 in Logan and the first hard freeze by about Oct 14. That first freezing night has ranged from Sep 18 to Oct 15, roughly a 27-day spread. On the spring side, the last 32°F freeze clears around May 8 and as late as Jun 2 — the green light for reopening water and de-winterizing. Snow totals near 44 inches a year mean plowing and ice-dam control share the winter to-do list here.

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

Compared with nearby cities, Logan's first-freeze date near Oct 14 sits about a week ahead of Ogden (Nov 3) and about a week ahead of Roy (Nov 2). Utah's deadlines span Oct 7 to Nov 13 statewide — one date for all of Utah would be off by weeks for Logan. Once you know Logan's freeze date, use it to winterize an RV and store a motorcycle too.

Other winter jobs in Logan

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

Sprinklers → Oct 4Frozen pipes → Sep 18Ice dams → Oct 16Car battery → Oct 14Snow blower → Oct 25Sump pump → May 8RV → Oct 4Motorcycle → Oct 2

See the full Logan 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 Oct 14 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 UT 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 Logan Radio Kvnu, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.