Winterizing a Denver Rental: Frozen Pipes, Heat Rules and Snow Removal for Landlords

Why winter is the riskiest season for Denver rentals

Denver winters are mild on average and brutal in bursts. The National Weather Service puts Denver's average first freeze in early October and the average last freeze in early May, and arctic fronts can drop temperatures below zero overnight. The most expensive landlord problems, burst pipes, failed furnaces and slip-and-fall claims, cluster in these few weeks.

The good news: almost all of it is preventable with a September checklist and a clear plan for who does what.

The heat rule: 70°F at -5°F

Denver's residential housing regulation requires every dwelling to have heating that can bring all habitable rooms, bathrooms and toilet rooms to at least 70°F, measured three feet above the floor, when the outdoor temperature is -5°F. The heat must be operated as reasonably necessary to keep habitable rooms at 70°F.

Two details owners miss:

• Space heaters and ovens don't count as heating facilities. Denver's rental inspection checklist says so explicitly.
• Capacity matters, not just "it turns on." An undersized or failing furnace that can't keep up on the coldest nights doesn't meet the rule.

Tenants can report heat problems to Denver 311.

No heat is an emergency under Colorado law

Colorado's warranty of habitability, rewritten by SB24-094 in 2024, lists lack of functioning heat from October through April among the conditions presumed to materially interfere with life, health or safety. That triggers the fastest timelines in the law:

"Written notice" is broad. It includes texts or emails sent the way you normally communicate, portal requests and messages to your maintenance staff.

If the tenant asks, you may also have to provide a comparable unit or a hotel room at no cost within 24 hours for a life, health or safety condition, with additional support after 48 hours. Our guide to Colorado landlord repair obligations covers relocation, repair-and-deduct and the other remedies.

The practical lesson: have an HVAC company you can reach on a Saturday night in January before you need one.

September checklist: prepare before the first freeze

Heating system

• Service the furnace or boiler. A licensed HVAC tech should inspect burners, heat exchanger, venting and safety controls. Ask for a written report.
• Replace the filter and leave spares for the tenant. Make filter changes part of the lease or your maintenance schedule.
• Test carbon monoxide and smoke detectors. Fuel-burning furnaces, water heaters and fireplaces make CO alarms essential.
• Check the thermostat and replace its batteries.

Pipes and water

• Disconnect garden hoses and shut off and drain outdoor faucets if they aren't frost-free.
• Blow out the sprinkler system. Irrigation backflow preventers and lines crack easily. Book this in September or early October. Denver Water has banned lawn watering and spray irrigation since October 1, 2026, so there's no reason to keep the system charged.
• Insulate exposed pipes in crawl spaces, garages, unheated basements and exterior walls.
• Know where the main shutoff is, label it and show the tenant. A burst pipe does far less damage if the water is off in two minutes rather than twenty.
• Winterize the swamp cooler if the home has one: drain it, disconnect the water line and cover it.

Roof, gutters and exterior

• Clean gutters and downspouts so melt water drains away from the foundation instead of forming ice dams.
• Check the roof for damaged shingles, especially after a summer hail season.
• Seal drafts around doors and windows. It improves comfort and reduces heating complaints.
• Fix trip hazards on walks and steps before they're hidden under snow.

Frozen pipes: prevention and insurance

A single burst pipe can cause tens of thousands of dollars in water damage. Prevention is cheap:

• Ask tenants to keep heat on when they travel, at a set minimum temperature.
• Open cabinet doors under sinks on exterior walls during deep cold snaps.
• Drip faucets on the coldest nights if pipes run through exterior walls.
• Share a cold-snap reminder by text or email when forecasts drop below about 10°F.

Insurance is the other half. The standard industry homeowners form covers freezing of plumbing and heating systems only if you used reasonable care to maintain heat in the building or to shut off the water and drain the systems. Rental properties are usually insured on dwelling-fire (landlord) forms instead, but similar conditions are common. The Insurance Information Institute notes that standard policies often limit or exclude coverage when a home is unoccupied for typically 30 to 60 consecutive days.

Between tenants, keep the heat on. Don't turn the thermostat off in a vacant rental. Many owners set it at 55°F or higher, check the property weekly and document each visit. If a home will sit empty for a long time, talk to your insurer about a vacancy endorsement, or have the plumbing professionally drained. See our landlord insurance guide for what to ask.

Snow removal: who shovels?

Denver requires sidewalks to be cleared of snow and ice after every snowfall. City guidance gives residences until the next day after the snow stops, and businesses must start immediately. The duty covers the sidewalk next to the property and adjacent curb ramps and bus stops.

Enforcement works like this: an inspector leaves a time-stamped notice. Residences then get 24 hours before a re-check and a potential $150 fine. Neighbors can report unshoveled sidewalks to 311 after 24 hours.

Owner or tenant? Denver's guidance names the property owner. A lease can assign shoveling to the tenant, and that's common for single-family homes, but the owner should expect to be the one cited if it doesn't happen. Practical options:

• Make it explicit in the lease if the tenant shovels, and supply a shovel and ice melt.
• Hire a snow service for condos, duplexes, multi-unit buildings and owners who are out of town.
• Don't forget elderly or disabled tenants, for whom shoveling isn't realistic.

Nearby cities have similar rules. Aurora requires owners to clear adjacent sidewalks within 24 hours after snow ends (48 hours after a declared snow emergency) and charges fees for non-compliance. Lakewood also requires clearing within 24 hours after a storm ends.

Use ice melt that's safe for concrete. New concrete and pavers can be damaged by harsh salts.

Tenant winter communication

Send a short message each fall covering:

1. How to report maintenance, including after hours, and what counts as an emergency (no heat, burst pipe, gas smell).
2. Where the water shutoff is and how to use it.
3. Thermostat minimums when traveling.
4. Who handles snow, and where the shovel and ice melt are.
5. A reminder to replace the furnace filter, if that's the tenant's job under the lease.

Clear expectations prevent most winter emergencies and most disputes.

The bottom line

Service the heat, protect the plumbing, keep vacant homes warm and settle the snow plan before the first storm. In Colorado, a no-heat call in winter starts a 24-hour clock, so the time to find your HVAC company is now.

How to get help

If a manager handles your rental, ask about winter specifically: do they schedule furnace service and sprinkler blowouts each fall, send tenants a winter checklist, cover emergencies around the clock and check vacant homes regularly? Get the answers in writing.

We'll match you with vetted, licensed Denver managers. Free, no obligation. See what to look for in maintenance and inspections or get matched free.