Every fall there is a version of this story. Someone skipped the full winterization, left a small amount of water in the pipes, and arrived in May to find a ceiling down and a repair bill that rewrote the spring budget. It happens more often than it should, and it almost always traces back to the same place: a checklist that was not quite complete or a step that felt optional in November and proved to be anything but. Northern Michigan winters do not forgive partial winterization. The checklist here is complete because it needs to be.

When to Start and What Drives the Timeline

The decision of when to close a seasonal property in northern Michigan is driven primarily by the risk of a hard freeze, which can arrive as early as mid-October in a cold year and as late as early November in a mild one. The National Weather Service forecast for the Traverse City area is the reliable reference for tracking the first freeze threat of the season. Most experienced seasonal property owners in the region target completion of full winterization by October 15th as a conservative but sensible default, adjusting for the specific year's forecast.

Starting the process in late September rather than mid-October gives the owner time to schedule contractors, address any issues discovered during the process, and close with the confidence that nothing was rushed. The plumbers and caretakers who specialize in seasonal property winterization in Leelanau County and Benzie County are in high demand in October. Scheduling early is not precaution. It is necessity.

The Plumbing Winterization Sequence

Water left in pipes is the single greatest risk to a seasonal property over a northern Michigan winter. The winterization sequence for plumbing should be thorough and systematic, not approximate:

• •        Shut off the main water supply at the source, whether a municipal connection or the well pressure tank

• •        Open all faucets, both hot and cold, at every fixture in the property including outdoor hose bibs, and leave them open to allow complete drainage

• •        Flush all toilets and add RV-safe antifreeze to toilet bowls and tanks to prevent cracking

• •        Add antifreeze to all drain traps, including sinks, tubs, showers, and floor drains, using RV-safe propylene glycol antifreeze rather than automotive antifreeze which is toxic

• •    If the property has an irrigation or sprinkler system, have it blown out professionally with compressed air before the first freeze

• •    Drain the water heater completely and leave the drain valve open

• •    If the property has a well, consult with a local well service about whether the pressure tank and pump require any specific winterization beyond shutting off the supply

Heating Systems: The Right Temperature Debate

The question of whether to leave heat on in a closed seasonal property or shut it down entirely is one of the more genuinely contested topics among northern Michigan property owners, and the right answer depends on the property's systems and construction.

For properties with in-floor radiant heat systems, hydronic heating, or any heating system tied to water, leaving the heat at a minimum setpoint of 45 to 50 degrees is typically required to prevent freeze damage to the system itself. For fully drained, conventionally heated structures, some owners choose to shut heating systems down entirely after winterization is complete, accepting the risk of any moisture-related issues in exchange for eliminating the utility cost and the mechanical failure risk of a system running unmonitored through a northern Michigan winter.

The most conservative and widely recommended approach for properties that are not actively monitored through the winter is to leave heat at 45 degrees minimum, install a low-temperature alarm system connected to a monitoring service or the owner's phone, and confirm that the heating system has been serviced and is in reliable condition before the season ends.

The Dock: Timing and Process

Dock removal is one of the most time-sensitive tasks in the cottage closing process and one of the most consequential if delayed. Ice formation on northern Michigan lakes typically begins in late November through December, and a dock caught in forming ice can sustain significant structural damage from ice heave and expansion forces. The general guidance from dock service companies in the region is to have docks out of the water by mid-November at the latest, with earlier removal preferred in years with cold fall forecasts.

Dock sections should be stored on shore in a location where they will not be damaged by snow load, vehicle traffic, or spring flooding. Hardware, dock lines, and electrical components should be stored indoors. Any dock lighting or electrical connections that extend into the water should be fully disconnected and the conduit capped or sealed.

Exterior, Mechanical, and Administrative Closing Tasks

Beyond plumbing and heating, a thorough seasonal property closing covers:

• •        Pest prevention: remove all food items from the property, clean all appliances thoroughly, seal any entry points around foundation penetrations, utility entries, and gaps in the exterior envelope where rodents can enter during winter

• •        Outdoor furniture and equipment: store or cover all outdoor furniture, grills, and equipment; drain gas from small engines; store kayaks, paddleboards, and watercraft appropriately

• •        Gutters and downspouts: clear gutters of fall leaves before closing to prevent ice damming over the winter

• •        Disconnect propane tanks from appliances if the property will be fully unoccupied; confirm with your insurance carrier whether disconnection is required under your policy terms

• •        Notify your insurance carrier that the property is being closed for the season; some policies require notification and have specific requirements for vacant seasonal properties

• •        Document the property's condition with photographs before closing for insurance purposes 

The Property Caretaker Relationship

For owners who live more than a short drive from their northern Michigan property, a local caretaker relationship is not optional. It is the system that catches the heating failure, the roof leak, the burst pipe that somehow escaped the winterization, and the tree limb that came down on the garage in January. A caretaker who checks the property monthly through the winter and responds to alarm notifications provides a level of risk management that no checklist can substitute for.

At The Foerster Group, we work with buyers across Traverse City and Leelanau County who are often closing their seasonal properties for the first time after purchase and navigating this process without the years of local knowledge that experienced seasonal owners accumulate. We are happy to share resources and connect new owners with local service providers who know this specific work. Reach out at thefoerstergroup.com. The list is here whenever you need it.