Heating a Home in Vermont: What the Winter Actually Costs

Burlington’s coldest month averages a daily low of 12.9°F, but the number that actually shapes a heating bill is how many months that cold sticks around. Vermont winters run long, and the equipment, the wood, and the timing all have to answer to that fact.

How cold it gets, and for how long

Start with the figure: 12.9°F is the average daily minimum for the coldest month at the Burlington reference station, based on NOAA’s 1991-2020 Climate Normals. That’s not a record low, and it’s not some abstract average smeared across the season. It’s what the thermometer tends to read most cold mornings during the worst stretch of winter, year after year.

A number like that only means something once you attach a season to it. Vermont doesn’t dip to freezing for a few weeks and bounce back. When Does the Heating Season Start in Vermont? Typically it runs from October into April, sometimes longer at higher elevations, which means a furnace or a wood stove isn’t dealing with a cold snap. It’s running, at some level, for six months or more.

That duration changes the math on everything downstream. A house that needs to hold heat against 12.9°F lows for four straight months burns through fuel differently than one that sees similar lows for six weeks and then warms up. It’s the difference between a sprint and something closer to an endurance event. Insulation quality, how tight the building envelope is, and how efficiently the heat source converts fuel into warmth all get magnified by time, not just by temperature.

This is also why a single cold night rarely breaks a heating system, but a long January does. Equipment sized for occasional cold snaps struggles when the demand doesn’t let up. Anyone heating with wood in this climate learns fast that the question isn’t “how cold will it get,” but “how many cords will it take to get through the whole stretch.”

The practical takeaway: plan fuel supply, whether that’s cords of wood, tanks of oil, or propane deliveries, around a season measured in months, not around the coldest single day. Vermont’s winter hardiness numbers matter for what survives outside, but for what keeps a house warm, the length of the cold is the bigger driver.

What a cord of wood is worth here

A cord is a volume, not a weight, and that distinction is where a lot of firewood buyers get shortchanged. By definition, a cord is a stack measuring 4 feet by 4 feet by 8 feet, which comes out to 128 cubic feet of stacked wood, air gaps included. Two cords of the same dimensions can hold very different amounts of usable heat depending on what species filled the stack, because denser wood packs more burnable mass into that same 128 cubic feet.

According to Michigan State University Extension, a cord of well-seasoned hardwood delivers about 20 million BTU. MSU frames that in terms a homeowner can actually use: one cord is roughly equivalent to the heat in 145 gallons of #2 fuel oil, or 215 gallons of LP gas. That’s a meaningful chunk of a Vermont heating season, though exactly how far it stretches depends on the house, the stove’s efficiency, and how many cords get burned alongside it.

The 20 million BTU figure is an average, not a guarantee. Species matters, and so does moisture. That’s where seasoning comes in, and it’s the single biggest variable a buyer controls. Wet wood doesn’t just burn worse, it burns backward from what you paid for: a chunk of the heat you’re expecting gets spent boiling off water trapped in the wood before any of it reaches the room. Buy a cord that hasn’t seasoned properly, and you’re effectively paying full price for a fraction of the BTU.

How long wood takes to dry in Vermont

Seasoning isn’t a calendar trick, it’s chemistry, and it depends on climate more than it depends on the tree. Green, freshly cut wood can carry more than 60 percent moisture content. To burn efficiently, that needs to drop to 20 percent or less, and getting there takes exposure to sun, wind, and dry air over time.

Split and stacked properly, most firewood reaches that 20 percent threshold after one full summer of seasoning, according to Michigan State University Extension. The emphasis matters: split and stacked, not left in rounds. Unsplit logs hold onto moisture far longer because there’s less exposed surface for air to reach. A round left whole through a Vermont summer can still be far too wet come October, even after months sitting in a yard.

Species plays a role too. Red oak is a named exception, drying more slowly than most hardwoods because of its cell structure. Wood that would season in one summer for a lot of species may need a second season if it’s red oak, even under otherwise good drying conditions.

Burn wood before it’s ready, and the consequences aren’t subtle. Less of the fuel’s energy goes toward heating the house, since a share of it evaporates trapped water instead. The unburned byproducts of that inefficient combustion condense in a cooler chimney flue as creosote, and creosote buildup is what turns a chimney sweep from an annual chore into something that needs attention mid-season. It’s not a dramatic risk on any single night, but it’s a maintenance and efficiency cost that compounds over a long Vermont winter if the wood pile never had enough time to dry out.

Where to check before you buy

Everything above describes conditions at the Burlington reference station, and Vermont covers a lot of elevation and exposure beyond that single point. A property in the Northeast Kingdom or up a mountain valley can run colder and hold snow longer than the Champlain Valley floor, which shifts both the heating season length and how long firewood needs to season outdoors.

Species availability also varies by region, and so do burn practices. Some Vermont towns and counties set seasonal restrictions on open burning or add requirements around outdoor wood boilers, and those rules are set locally and can change from year to year. There’s no single statewide answer that covers every property.

The University of Vermont Extension is the resource built for exactly this kind of local variation. It can point to species that season well in a specific part of the state, current guidance on outdoor burning, and practical advice suited to the elevation and exposure of a particular property, details that a statewide average simply can’t cover.

What each heat source costs to run in Vermont

At Vermont’s average residential prices, this is what one million Btu of heat delivered into the house costs with each system. It compares fuels on the same unit: it is not a yearly bill, and it leaves out the price of the equipment.

Cheapest to run in Vermont: natural gas furnace, $11.68 less per million Btu than the heat pump.

Prices: U.S. Energy Information Administration (EIA), average residential prices. Efficiencies: ENERGY STAR criteria. A heat pump’s figure is a seasonal average; in the coldest weather its efficiency drops.

Related guides

• Heating a Home in Minnesota: What the Winter Actually Costs
• Heating a Home in Michigan: What the Winter Actually Costs