When Does Denver Get Its First Freeze?
The Denver metro area typically sees its first freeze between mid-September and mid-October, though early freezes have happened in late September. The Front Range is known for sudden temperature swings — it can be 80°F one day and below freezing the next. That's why preparation matters.
HVAC Checklist: Get Your Heating Ready
Test Your Furnace Before You Need It
Turn on your furnace now, before the first cold night. Let it run for 30 minutes. A slight burning smell during the first run is normal — that's dust burning off the heat exchanger. But if the smell persists, or the furnace won't ignite, or it makes unusual banging or screeching sounds, call a technician while scheduling is still easy. Once the first freeze hits, every HVAC company in Denver is slammed.
Replace Your Air Filter
Start the heating season with a fresh filter. A clean filter helps your furnace run efficiently and keeps your air clean during the months you'll have windows closed.
Schedule a Fall Tune-Up
A professional furnace tune-up includes inspecting the heat exchanger for cracks (carbon monoxide risk), testing the ignition system, checking gas connections, cleaning burners, and verifying the thermostat calibration. This is the single best thing you can do to prevent a mid-winter breakdown.
Protect Your Pipes
Disconnect Garden Hoses
Water left in a connected hose can freeze backward into the pipe and crack the faucet or supply line. Disconnect all hoses, drain them, and if you have interior shut-off valves for outdoor faucets, close them and open the outdoor faucet to drain remaining water.
Insulate Exposed Pipes
Pipes in unheated areas like garages, crawl spaces, and along exterior walls are vulnerable. Foam pipe insulation costs a few dollars at any hardware store and takes minutes to install. This can prevent thousands of dollars in water damage from a burst pipe.
Seal Your Home
Check weatherstripping around doors and windows. Feel for drafts on a windy day. Caulk any gaps around window frames, door frames, and where pipes or wires enter the house. A tube of caulk costs $5 but can save hundreds in heating costs over the winter.
Outdoor AC Unit
You do NOT need to cover your outdoor AC unit for winter — modern units are designed to handle snow and cold. However, do remove any debris, leaves, or grass clippings from around the unit before winter sets in. Keep at least 2 feet of clearance on all sides.